Chevrolet - Trailblazer 2wd - Workshop Manual - 2006 - 2006

Factory Workshop Manual Make Chevrolet Model Trailblazer 2wd Engine and year V8-6.0L VIN H (2006) Please navigate through the PDF using the options provided by OnlyManuals.com on the sidebar. This manual was submitted by Anonymous Date 1st January 2018 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Accessory Delay Relay > Component Information > Locations Accessory Delay Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Accessory Delay Relay > Component Information > Locations > Page 8 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Accessory Delay Relay > Component Information > Locations > Page 9 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Accessory Delay Relay > Component Information > Locations > Page 10 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Locations Steering Column Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions Alarm Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 16 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 17 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 18 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 19 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 20 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 21 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 22 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 23 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 24 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 25 Alarm Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 26 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 27 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 28 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 29 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 30 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 31 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 32 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 33 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 34 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 35 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 36 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 37 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 38 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 39 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 40 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 41 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 42 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 43 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 44 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 45 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 46 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 47 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 48 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 49 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 50 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 51 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 52 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 53 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 54 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 55 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 56 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 57 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 58 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 59 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 60 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 61 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 62 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 63 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 64 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 65 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 66 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 67 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 68 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 69 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 70 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 71 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 72 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 73 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 74 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 75 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 76 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 77 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 78 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 79 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 80 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 81 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 82 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 83 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 84 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 85 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 86 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 87 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 88 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Diagram Information and Instructions > Page 89 Theft Deterrent Control Module Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Diagrams > Page 90 Alarm Module: Service and Repair THEFT DETERRENT CONTROL MODULE REPLACEMENT REMOVAL PROCEDURE 1. Disable the SIR system. Refer to SIR Disabling and Enabling. CAUTION: Refer to SIR Caution. 2. Remove the upper and lower trim covers. 3. Remove the lock cylinder. 4. Disconnect the connector from the theft deterrent control module. 5. If necessary, disconnect the connector from the ignition lock cylinder case (1). 6. Remove the theft deterrent control module (2) from the ignition lock cylinder case assembly (1). INSTALLATION PROCEDURE 1. Install the theft deterrent control module (2) onto the ignition lock cylinder case assembly (1). 2. Connect the connector to the theft deterrent control module. CAUTION: Refer to SIR Inflator Module Coil Caution. 3. If necessary, connect the connector to the ignition lock cylinder case. 4. Install the lock cylinder. 5. Install the upper and lower trim covers. 6. Enable the SIR system. Refer to SIR Disabling and Enabling. 7. Program the theft deterrent control module. Refer to Programming Theft Deterrent System Components. 8. Refer to Control Module References for programming and setup information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > Recalls: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) Technical Service Bulletin # 10037 Date: 100420 Campaign - Unwanted Repeat Calls to OnStar(R) CUSTOMER SATISFACTION Bulletin No.: 10037 Date: April 20, 2010 Subject: 10037 - Unwanted Repeat Calls to OnStar(R) Models: 2003 Buick LeSabre 2004-2006 Buick Rendezvous 2005 Buick LeSabre, Terraza 2005-2006 Buick LaCrosse/Allure 2006-2008 Buick Lucerne 2008 Buick LaCrosse/Allure 2008-2009 Buick Enclave 2003 Cadillac CTS 2004 Cadillac Escalade 2004-2005 Cadillac CTS-V, Deville 2005 Cadillac Escalade ESV, SRX 2005-2006 Cadillac STS 2005-2008 Cadillac CTS 2006-2008 Cadillac DTS 2007 Cadillac Escalade, Escalade EXT 2007-2008 Cadillac Escalade ESV 2008 Cadillac SRX, STS 2002 Chevrolet Impala 2003-2008 Chevrolet Suburban 2003-2009 Chevrolet Silverado 2004-2008 Chevrolet Impala 2005 Chevrolet Colorado, Corvette, Malibu 2005-2006 Chevrolet Uplander 2005-2008 Chevrolet Avalanche, Tahoe, TrailBlazer 2006 Chevrolet HHR, Monte Carlo 2006-2008 Chevrolet Equinox 2007-2008 Chevrolet Corvette 2008 Chevrolet HHR 2008-2009 Chevrolet Cobalt, Colorado, Malibu, Uplander 2003 GMC Envoy XL, Sierra, Yukon XL 2004-2008 GMC Yukon 2005-2009 GMC Sierra 2005-2008 GMC Yukon XL 2006-2008 GMC Envoy 2007 GMC Canyon 2007-2009 GMC Acadia 2006 HUMMER H2 2006-2008 HUMMER H3 2008 HUMMER H2 2003 Oldsmobile Silhouette 2005 Montana SV6 2005-2008 Pontiac Grand Prix 2006 Pontiac G6, Vibe 2007 Pontiac Montana SV6 2007-2008 Pontiac Solstice 2008 Pontiac G6, Torrent 2008-2009 Pontiac G5, G8 2009 Pontiac G3, Montana SV6 2005-2007 Saturn ION 2006-2009Saturn VUE 2007-2008 Saturn AURA, OUTLOOK, SKY Equipped with OnStar(R) (RPO UE1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > Recalls: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 99 THIS PROGRAM IS IN EFFECT UNTIL APRIL 30, 2011. Condition Certain 2002-2009 model year vehicles equipped with OnStar(R) may have a condition in which the vehicle's OnStar(R) system repeatedly makes incomplete calls to OnStar(R) without the vehicle's occupant(s) input or knowledge. Customer initiated Blue Button call, Emergency calls, and Automatic Crash Notification calls will also fail to establish a data connection with the OnStar(R) Call Center. Eventually, the customer's call will connect as a voice only line and the customer will be able to talk with an OnStar(R) advisor; however, the advisor will not get crucial customer data such as vehicle identification and location. Correction Dealers/retailers are to replace the OnStar(R) module (VCIM). Vehicles Involved Involved are certain 2002-2009 model year vehicles equipped with OnStar(R), and built within these VIN breakpoints: Note: Some model years/models have only one vehicle involved. Important Dealers/retailers are to confirm vehicle eligibility prior to beginning repairs by using GMVIS (dealers/retailers using WINS) or the Investigate Vehicle History link (dealers/retailers using GWM). Not all vehicles within the above breakpoints may be involved. For dealers/retailers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided to dealers/retailers through the GM GlobalConnect Recall Reports. Dealers/retailers will not have a report available if they have no involved vehicles currently assigned. The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program. Parts Information US: OnStar(R) modules required for this program are to be obtained by contacting Autocraft Electronics via the web at www.autocraft.com, and selecting the catalog item that contains bulletin number 10037 (or PIC 4893B), or by calling 1-800-336-3998. Dealer must provide the VIN, R.O. number, and the current vehicle mileage. Canada: OnStar(R) modules required for this program are to be obtained by contacting MASS Electronics at 1-877-410-6277. Dealer must provide the VIN, R.O. number, and the current vehicle mileage. DO NOT ORDER ONSTAR(R) MODULES FROM GENERAL MOTORS CUSTOMER CARE AND AFTERSALES (GMCC&A;), SATURN SERVICE PARTS OPERATION (SSPO), OR THE TECHNICAL ASSISTANCE CENTER (TAC). Courtesy Transportation The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranties. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers/retailers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines. Claim Information 1. Submit a claim using the table below. 2. Courtesy Transportation - For dealers/retailers using WINS, submit using normal labor code; for dealers/retailers using GWM - submit as Net Item under the repair labor code. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > Recalls: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 100 * Dealers using WINs: Add 0.2 hours to the labor time for administrative allowance for the module exchange. Dealers using GWM: Submit 0.2 hours administrative allowance under "Administration Time" for the module exchange. ** The $25 represents the additional net amount allowed for the module exchange. *** Dealers are to claim only administrative allowance of 0.2 hours when the module is replaced by Masscomp's Mobile Unit. Dealers using WINS should submit the 0.2 hours administrative allowance in labor time. Dealer using GWM should submit the 0.2 hours administrative allowance under Administrative Time. Customer Notification OnStar will notify customers of this program on their vehicle. Dealer Program Responsibility All unsold new vehicles in dealers'/retailers' possession and subject to this program must be held and inspected/repaired per the service procedure of this program bulletin before customers take possession of these vehicles. Dealers/retailers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, through April 30, 2011. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer/retailer listing, are to be contacted by the dealer/retailer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > Recalls: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 101 In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your dealership/facility for service through April 30, 2011, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle. Disclaimer Service Procedure Service Procedure Note Do NOT replace the inside rear view mirror in tandem with this concern. The mirror has no bearing on this specific issue. 1. Remove the OnStar(R) module (referred to as the Communication Interface Module (CIM) or Vehicle Communication Interface Module (VCIM) in SI). Refer to SI for module removal instructions. Note Inform customer that all Bluetooth devices must be paired with the new VCIM. Bluetooth devices that have not been paired to the new VCIM will not function properly. 2. Install the new OnStar(R) module (referred to as the Communication Interface Module (CIM) or Vehicle Communication Interface Module (VCIM) in SI). Refer to SI for module installation instructions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Torque Converter Clutch: All Technical Service Bulletins A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Bulletin No.: 06-07-30-007A Date: February 20, 2007 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) On, Diagnostic Trouble Code (DTC) P0894, Harsh 1-2 Shift with 4L60-E, 4L65-E, 4L70-E Automatic Transmission (Test and Replace Torque Converter Clutch (TCC) Enable Solenoid/Harness, Auto Trans Wiring) Models: 2006 Cadillac Escalade Models 2006 Chevrolet Light Duty Trucks 2006 Chevrolet Express Vans 2006 GMC Light Duty Trucks 2006 GMC Savana Vans 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E / 4L65-E / 4L70-E (RPOs M30, M32, M70) Automatic Transmission Supercede: This bulletin is being revised to add part number for vehicles with Input Speed Sensor (ISS). Please discard Corporate Bulletin Number 06-07-30-007 (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a harsh 1-2 shift with the MIL illuminated. Diagnosis with a scan tool may reveal a DTC P0894. Cause This condition may be caused by a leaking TCC enable solenoid. The TCC enable solenoid is part of the automatic transmission wiring harness. Correction Follow the diagnosis and repair procedure below for a DTC P0894. With a scan tool, verify the presence of DTC P0894. Remove the TCC Enable solenoid / automatic transmission wiring harness. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 107 Typically if the TCC enable solenoid is found to have a crack/fracture (2), it will be located parallel to the mold seam (1) as shown above. Engineering investigation shows that TCC enable solenoids that are brown in color may exhibit the cracking / fracture condition. Engineering investigation shows that TCC enable solenoids that are off-white in color do not exhibit the cracking / fracture condition. Air check the TCC enable solenoid using J 44246 solenoid testing kit. Install the TCC enable solenoid into bore # 2 of J 44246 as shown above. While air is being applied to the solenoid through J 44246, coat the outside of the solenoid body with transmission fluid to help expose a possible vertical crack in the molded part of the solenoid body. This crack may be very small and not visible without the use of ATF. Complete instructions for the Shift Solenoid Leak Test can be found in SI Document ID # 856531. If NO visual leaks are found in the TCC enable solenoid, refer to DTC P0894 in the appropriate SI Document. If visual leaks are found in the TCC enable solenoid, continue with the next step. Replace the TCC enable solenoid. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Road test the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 108 Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Communications Control Module: > 06-07-30-007A > Feb > 07 > Recalls for Communications Control Module: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) Technical Service Bulletin # 10037 Date: 100420 Campaign - Unwanted Repeat Calls to OnStar(R) CUSTOMER SATISFACTION Bulletin No.: 10037 Date: April 20, 2010 Subject: 10037 - Unwanted Repeat Calls to OnStar(R) Models: 2003 Buick LeSabre 2004-2006 Buick Rendezvous 2005 Buick LeSabre, Terraza 2005-2006 Buick LaCrosse/Allure 2006-2008 Buick Lucerne 2008 Buick LaCrosse/Allure 2008-2009 Buick Enclave 2003 Cadillac CTS 2004 Cadillac Escalade 2004-2005 Cadillac CTS-V, Deville 2005 Cadillac Escalade ESV, SRX 2005-2006 Cadillac STS 2005-2008 Cadillac CTS 2006-2008 Cadillac DTS 2007 Cadillac Escalade, Escalade EXT 2007-2008 Cadillac Escalade ESV 2008 Cadillac SRX, STS 2002 Chevrolet Impala 2003-2008 Chevrolet Suburban 2003-2009 Chevrolet Silverado 2004-2008 Chevrolet Impala 2005 Chevrolet Colorado, Corvette, Malibu 2005-2006 Chevrolet Uplander 2005-2008 Chevrolet Avalanche, Tahoe, TrailBlazer 2006 Chevrolet HHR, Monte Carlo 2006-2008 Chevrolet Equinox 2007-2008 Chevrolet Corvette 2008 Chevrolet HHR 2008-2009 Chevrolet Cobalt, Colorado, Malibu, Uplander 2003 GMC Envoy XL, Sierra, Yukon XL 2004-2008 GMC Yukon 2005-2009 GMC Sierra 2005-2008 GMC Yukon XL 2006-2008 GMC Envoy 2007 GMC Canyon 2007-2009 GMC Acadia 2006 HUMMER H2 2006-2008 HUMMER H3 2008 HUMMER H2 2003 Oldsmobile Silhouette 2005 Montana SV6 2005-2008 Pontiac Grand Prix 2006 Pontiac G6, Vibe 2007 Pontiac Montana SV6 2007-2008 Pontiac Solstice 2008 Pontiac G6, Torrent 2008-2009 Pontiac G5, G8 2009 Pontiac G3, Montana SV6 2005-2007 Saturn ION 2006-2009Saturn VUE 2007-2008 Saturn AURA, OUTLOOK, SKY Equipped with OnStar(R) (RPO UE1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Communications Control Module: > 06-07-30-007A > Feb > 07 > Recalls for Communications Control Module: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 118 THIS PROGRAM IS IN EFFECT UNTIL APRIL 30, 2011. Condition Certain 2002-2009 model year vehicles equipped with OnStar(R) may have a condition in which the vehicle's OnStar(R) system repeatedly makes incomplete calls to OnStar(R) without the vehicle's occupant(s) input or knowledge. Customer initiated Blue Button call, Emergency calls, and Automatic Crash Notification calls will also fail to establish a data connection with the OnStar(R) Call Center. Eventually, the customer's call will connect as a voice only line and the customer will be able to talk with an OnStar(R) advisor; however, the advisor will not get crucial customer data such as vehicle identification and location. Correction Dealers/retailers are to replace the OnStar(R) module (VCIM). Vehicles Involved Involved are certain 2002-2009 model year vehicles equipped with OnStar(R), and built within these VIN breakpoints: Note: Some model years/models have only one vehicle involved. Important Dealers/retailers are to confirm vehicle eligibility prior to beginning repairs by using GMVIS (dealers/retailers using WINS) or the Investigate Vehicle History link (dealers/retailers using GWM). Not all vehicles within the above breakpoints may be involved. For dealers/retailers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided to dealers/retailers through the GM GlobalConnect Recall Reports. Dealers/retailers will not have a report available if they have no involved vehicles currently assigned. The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program. Parts Information US: OnStar(R) modules required for this program are to be obtained by contacting Autocraft Electronics via the web at www.autocraft.com, and selecting the catalog item that contains bulletin number 10037 (or PIC 4893B), or by calling 1-800-336-3998. Dealer must provide the VIN, R.O. number, and the current vehicle mileage. Canada: OnStar(R) modules required for this program are to be obtained by contacting MASS Electronics at 1-877-410-6277. Dealer must provide the VIN, R.O. number, and the current vehicle mileage. DO NOT ORDER ONSTAR(R) MODULES FROM GENERAL MOTORS CUSTOMER CARE AND AFTERSALES (GMCC&A;), SATURN SERVICE PARTS OPERATION (SSPO), OR THE TECHNICAL ASSISTANCE CENTER (TAC). Courtesy Transportation The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranties. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers/retailers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines. Claim Information 1. Submit a claim using the table below. 2. Courtesy Transportation - For dealers/retailers using WINS, submit using normal labor code; for dealers/retailers using GWM - submit as Net Item under the repair labor code. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Communications Control Module: > 06-07-30-007A > Feb > 07 > Recalls for Communications Control Module: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 119 * Dealers using WINs: Add 0.2 hours to the labor time for administrative allowance for the module exchange. Dealers using GWM: Submit 0.2 hours administrative allowance under "Administration Time" for the module exchange. ** The $25 represents the additional net amount allowed for the module exchange. *** Dealers are to claim only administrative allowance of 0.2 hours when the module is replaced by Masscomp's Mobile Unit. Dealers using WINS should submit the 0.2 hours administrative allowance in labor time. Dealer using GWM should submit the 0.2 hours administrative allowance under Administrative Time. Customer Notification OnStar will notify customers of this program on their vehicle. Dealer Program Responsibility All unsold new vehicles in dealers'/retailers' possession and subject to this program must be held and inspected/repaired per the service procedure of this program bulletin before customers take possession of these vehicles. Dealers/retailers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, through April 30, 2011. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer/retailer listing, are to be contacted by the dealer/retailer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Communications Control Module: > 06-07-30-007A > Feb > 07 > Recalls for Communications Control Module: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 120 In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your dealership/facility for service through April 30, 2011, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle. Disclaimer Service Procedure Service Procedure Note Do NOT replace the inside rear view mirror in tandem with this concern. The mirror has no bearing on this specific issue. 1. Remove the OnStar(R) module (referred to as the Communication Interface Module (CIM) or Vehicle Communication Interface Module (VCIM) in SI). Refer to SI for module removal instructions. Note Inform customer that all Bluetooth devices must be paired with the new VCIM. Bluetooth devices that have not been paired to the new VCIM will not function properly. 2. Install the new OnStar(R) module (referred to as the Communication Interface Module (CIM) or Vehicle Communication Interface Module (VCIM) in SI). Refer to SI for module installation instructions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Torque Converter Clutch: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) Technical Service Bulletin # 10037 Date: 100420 Campaign - Unwanted Repeat Calls to OnStar(R) CUSTOMER SATISFACTION Bulletin No.: 10037 Date: April 20, 2010 Subject: 10037 - Unwanted Repeat Calls to OnStar(R) Models: 2003 Buick LeSabre 2004-2006 Buick Rendezvous 2005 Buick LeSabre, Terraza 2005-2006 Buick LaCrosse/Allure 2006-2008 Buick Lucerne 2008 Buick LaCrosse/Allure 2008-2009 Buick Enclave 2003 Cadillac CTS 2004 Cadillac Escalade 2004-2005 Cadillac CTS-V, Deville 2005 Cadillac Escalade ESV, SRX 2005-2006 Cadillac STS 2005-2008 Cadillac CTS 2006-2008 Cadillac DTS 2007 Cadillac Escalade, Escalade EXT 2007-2008 Cadillac Escalade ESV 2008 Cadillac SRX, STS 2002 Chevrolet Impala 2003-2008 Chevrolet Suburban 2003-2009 Chevrolet Silverado 2004-2008 Chevrolet Impala 2005 Chevrolet Colorado, Corvette, Malibu 2005-2006 Chevrolet Uplander 2005-2008 Chevrolet Avalanche, Tahoe, TrailBlazer 2006 Chevrolet HHR, Monte Carlo 2006-2008 Chevrolet Equinox 2007-2008 Chevrolet Corvette 2008 Chevrolet HHR 2008-2009 Chevrolet Cobalt, Colorado, Malibu, Uplander 2003 GMC Envoy XL, Sierra, Yukon XL 2004-2008 GMC Yukon 2005-2009 GMC Sierra 2005-2008 GMC Yukon XL 2006-2008 GMC Envoy 2007 GMC Canyon 2007-2009 GMC Acadia 2006 HUMMER H2 2006-2008 HUMMER H3 2008 HUMMER H2 2003 Oldsmobile Silhouette 2005 Montana SV6 2005-2008 Pontiac Grand Prix 2006 Pontiac G6, Vibe 2007 Pontiac Montana SV6 2007-2008 Pontiac Solstice 2008 Pontiac G6, Torrent 2008-2009 Pontiac G5, G8 2009 Pontiac G3, Montana SV6 2005-2007 Saturn ION 2006-2009Saturn VUE 2007-2008 Saturn AURA, OUTLOOK, SKY Equipped with OnStar(R) (RPO UE1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Torque Converter Clutch: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 126 THIS PROGRAM IS IN EFFECT UNTIL APRIL 30, 2011. Condition Certain 2002-2009 model year vehicles equipped with OnStar(R) may have a condition in which the vehicle's OnStar(R) system repeatedly makes incomplete calls to OnStar(R) without the vehicle's occupant(s) input or knowledge. Customer initiated Blue Button call, Emergency calls, and Automatic Crash Notification calls will also fail to establish a data connection with the OnStar(R) Call Center. Eventually, the customer's call will connect as a voice only line and the customer will be able to talk with an OnStar(R) advisor; however, the advisor will not get crucial customer data such as vehicle identification and location. Correction Dealers/retailers are to replace the OnStar(R) module (VCIM). Vehicles Involved Involved are certain 2002-2009 model year vehicles equipped with OnStar(R), and built within these VIN breakpoints: Note: Some model years/models have only one vehicle involved. Important Dealers/retailers are to confirm vehicle eligibility prior to beginning repairs by using GMVIS (dealers/retailers using WINS) or the Investigate Vehicle History link (dealers/retailers using GWM). Not all vehicles within the above breakpoints may be involved. For dealers/retailers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided to dealers/retailers through the GM GlobalConnect Recall Reports. Dealers/retailers will not have a report available if they have no involved vehicles currently assigned. The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program. Parts Information US: OnStar(R) modules required for this program are to be obtained by contacting Autocraft Electronics via the web at www.autocraft.com, and selecting the catalog item that contains bulletin number 10037 (or PIC 4893B), or by calling 1-800-336-3998. Dealer must provide the VIN, R.O. number, and the current vehicle mileage. Canada: OnStar(R) modules required for this program are to be obtained by contacting MASS Electronics at 1-877-410-6277. Dealer must provide the VIN, R.O. number, and the current vehicle mileage. DO NOT ORDER ONSTAR(R) MODULES FROM GENERAL MOTORS CUSTOMER CARE AND AFTERSALES (GMCC&A;), SATURN SERVICE PARTS OPERATION (SSPO), OR THE TECHNICAL ASSISTANCE CENTER (TAC). Courtesy Transportation The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranties. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers/retailers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines. Claim Information 1. Submit a claim using the table below. 2. Courtesy Transportation - For dealers/retailers using WINS, submit using normal labor code; for dealers/retailers using GWM - submit as Net Item under the repair labor code. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Torque Converter Clutch: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 127 * Dealers using WINs: Add 0.2 hours to the labor time for administrative allowance for the module exchange. Dealers using GWM: Submit 0.2 hours administrative allowance under "Administration Time" for the module exchange. ** The $25 represents the additional net amount allowed for the module exchange. *** Dealers are to claim only administrative allowance of 0.2 hours when the module is replaced by Masscomp's Mobile Unit. Dealers using WINS should submit the 0.2 hours administrative allowance in labor time. Dealer using GWM should submit the 0.2 hours administrative allowance under Administrative Time. Customer Notification OnStar will notify customers of this program on their vehicle. Dealer Program Responsibility All unsold new vehicles in dealers'/retailers' possession and subject to this program must be held and inspected/repaired per the service procedure of this program bulletin before customers take possession of these vehicles. Dealers/retailers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, through April 30, 2011. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer/retailer listing, are to be contacted by the dealer/retailer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Torque Converter Clutch: > 10037 > Apr > 10 > Campaign - Unwanted Repeat Calls to OnStar(R) > Page 128 In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your dealership/facility for service through April 30, 2011, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle. Disclaimer Service Procedure Service Procedure Note Do NOT replace the inside rear view mirror in tandem with this concern. The mirror has no bearing on this specific issue. 1. Remove the OnStar(R) module (referred to as the Communication Interface Module (CIM) or Vehicle Communication Interface Module (VCIM) in SI). Refer to SI for module removal instructions. Note Inform customer that all Bluetooth devices must be paired with the new VCIM. Bluetooth devices that have not been paired to the new VCIM will not function properly. 2. Install the new OnStar(R) module (referred to as the Communication Interface Module (CIM) or Vehicle Communication Interface Module (VCIM) in SI). Refer to SI for module installation instructions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 05-08-46-004C > Dec > 10 > OnStar(R) - Number Incorrect/Incorrectly Assigned Emergency Contact Module: Customer Interest OnStar(R) - Number Incorrect/Incorrectly Assigned INFORMATION Bulletin No.: 05-08-46-004C Date: December 23, 2010 Subject: OnStar(R) Phone Number Concerns (Phone Number Incorrect/Assigned to Another Vehicle/Phone) That Occur During Diagnosis of OnStar(R) System Models: 2000-2011 GM Passenger Cars and Trucks Equipped with OnStar(R) (RPO UE1) Supercede: This bulletin is being revised to update model years up to 2011. Please discard Corporate Bulletin Number 05-08-46-004B (Section 08 - Body and Accessories). During diagnosis of an OnStar(R) concern, the technician may be told that the OnStar(R) phone number is incorrect or tied to another vehicle and/or phone of some kind. To resolve these concerns, the Tech 2(R) with software version 22.005 (or higher), has the capability to change the OnStar(R) phone number. Service Procedure 1. With the Tech 2(R), build the vehicle to specifications within the Diagnostics area of the Tech 2(R). 2. For vehicles with physical-based diagnostics - under Body, go to the OnStar(R) section. Then select the Special Functions menu. For vehicles with functional-based diagnostics - under Body and Accessories, go to the Cellular Communication section. Select Module Setup and then Vehicle Communication Interface Module. 3. Locate the Program Phone Number prompt and select it. The original phone number will be displayed on the Tech 2(R) screen. 4. Contact the OnStar(R) team at the GM Technical Assistance Center (TAC) to obtain a new phone number. 5. Highlight the digits of the phone number one at a time and enter the new phone number using the number keys on the Tech 2(R). 6. Press the Soft key at the base of the screen for Done once these numbers have been changed on the screen. 7. Press the Soft key for Done again. The area code or new phone number has now been programmed into the phone. 8. Cycle the ignition to Off and open the driver's door. 9. Press the blue OnStar(R) button to make sure that a normal connection can be made to the OnStar(R) call center. If applicable, make sure the Hands-Free Calling (HFC) works properly by making a phone call. 10. If the system is working properly, fax or voicemail a case closing into the OnStar(R) team at TAC with the results. Dealers in Canada should submit case closing information through the GM infoNET. Please follow this diagnostic process thoroughly and complete each step. If the condition exhibited is resolved WITHOUT completing every step, the remaining steps do not need to be performed. If the procedure above does not resolve the condition, you must contact TAC for further assistance. This diagnostic approach was developed specifically for this condition and should not automatically be used for other vehicles with similar symptoms. Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 05-08-46-004C > Dec > 10 > OnStar(R) - Number Incorrect/Incorrectly Assigned > Page 137 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 05-08-46-001D > May > 08 > OnStar(R) - No Power/Inoperative/No LED Emergency Contact Module: Customer Interest OnStar(R) - No Power/Inoperative/No LED TECHNICAL Bulletin No.: 05-08-46-001D Date: May 02, 2008 Subject: OnStar(R) Generation 5 or 6 (Digital) System Inoperative/Has No Power, LED Light Not On (Remove/Reinstall OnStar(R) Fuse and Replace VCIM or Follow SI Diagnostics) Models Supercede: This bulletin is being revised to update the information on VCIM ordering instructions in step 3 of the Correction statement. Please discard Corporate Bulletin Number 05-08-46-001C (Section 08 - Body & Accessories). Condition Some customers may comment any or all of the following conditions: ^ The OnStar(R) system may be inoperative. ^ The OnStar(R) system may have no power. ^ The OnStar(R) LED light may not be on. The technician may also not be able to communicate with the OnStar(R) Vehicle Communication Interface Module (VCIM) with a Tech 2(R). Correction Notice: On 2006 Chevrolet Impala and Monte Carlo models, make sure the ignition is OFF and the vehicle has "RAP"ed out prior to removing the OnStar(R) fuse. Disconnecting power to the OnStar(R) module while the ignition is ON may discharge and permanently damage the OnStar(R) back-up battery. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 05-08-46-001D > May > 08 > OnStar(R) - No Power/Inoperative/No LED > Page 142 Important: This bulletin does NOT apply to 2006 vehicles built AFTER the VIN breakpoints listed above. Refer to applicable diagnostics in SI for those vehicles that exhibit this condition. Remove the OnStar(R) fuse from the fuse box, wait five minutes and reinstall the fuse. (For Saturn VUE vehicles, remove the "INT LTS" fuse from the I/P fuse block for five minutes, then reinstall the fuse.) If the OnStar(R) system DOES NOT return to normal functionality, then follow the diagnostics in SI for this condition. If the OnStar(R) system DOES return to normal functionality, perform the following steps: 1. Install the Tech 2(R) and determine what generation hardware and software ID is in the vehicle. 2. If the vehicle is equipped with Generation 5 hardware and a software version 146, the VCIM should have the B1000 reprogramming performed as described in Corporate Bulletin Number 04-08-46-004A. The system should be tested and if the concern returns, the VCIM should be replaced. 3. If Gen 5 with a software version OTHER than 146 or Gen 6 and above, the VCIM needs to be replaced and the system reconfigured. Refer to the current version of Corporate Bulletin 03-08-46-004 for details on how to order a new VCIM. Important: As with any OnStar(R) VCIM replacement, the OnStar(R) system must be reconfigured after replacement. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 02-08-46-006C > Jan > 08 > OnStar(R) - Incorrect GPS Position Reported During Call Emergency Contact Module: Customer Interest OnStar(R) - Incorrect GPS Position Reported During Call Bulletin No.: 02-08-46-006C Date: January 08, 2008 INFORMATION Subject: Incorrect OnStar(R) Global Positioning System (GPS) Location Reported During OnStar(R) Call Models: 2000-2008 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2008 Saab 9-7X with OnStar(R) Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 02-08-46-006B (Section 08 - Body and Accessories). A small number of the above-mentioned vehicles may exhibit a condition in which the vehicle reports an inaccurate location to the OnStar(R) Call Center. This condition can only be identified via a button press to the OnStar(R) Call Center by the customer. Call Center personnel will be able to identify this inaccurate location condition. Customers will then be notified through the mail by OnStar(R) if their vehicle exhibits this condition. Once this condition has been identified OnStar(R) will instruct the customer to return to the dealership to have this condition corrected. It is not necessary to reconfigure the vehicle after the following procedure. In order to correct this condition you must cycle power to the OnStar(R) system. This can be done by either removing the fuses powering the OnStar(R) system or disconnecting the OnStar(R) module (VCIM) from the vehicle. As a last resort you can disconnect the vehicle's battery. The power needs to be removed from the system for approximately 15 minutes. After completing this procedure the vehicle should be taken to an area with an unobstructed view of the sky. The vehicle should be kept running for approximately 10 minutes to allow the vehicle to reacquire the global positioning system (GPS). Then contact the OnStar(R) Call Center via the blue OnStar(R) button and ask the advisor to verify the GPS position. If the OnStar(R) advisor still has an inaccurate GPS location refer to the Navigation Systems and Cellular Communications sub-sections in the Service Manual in order to diagnose and repair the concern. If the normal diagnostics lead to module replacement you will need to contact Technical Assistance (TAC) and choose the OnStar(R) prompt. GM OnStar(R) TAC will assist in the diagnosis and if appropriate order a replacement part. Replacement parts are usually shipped out within 24 hours and a pre-paid return package label will be included for returning the faulty part. By returning the faulty part you will avoid a significant non-return core charge. Warranty Information (excluding Saab US Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab US Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 02-08-46-006C > Jan > 08 > OnStar(R) - Incorrect GPS Position Reported During Call > Page 147 For vehicles repaired under warranty use, the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 02-08-46-007C > Nov > 07 > OnStar(R) - Loss of GPS Signal/Hands Free Issues Emergency Contact Module: Customer Interest OnStar(R) - Loss of GPS Signal/Hands Free Issues Bulletin No.: 02-08-46-007C Date: November 19, 2007 INFORMATION Subject: Information on OnStar(R) System - Possible Loss of GPS Signal, Hands-Free Calling Minutes Expire Prematurely and/or Inability to Add Hands-Free Calling Minutes Models: 2001-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn) 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2008 Saab 9-7X with OnStar(R) System (RPO UE1) Supercede: This bulletin is being revised to add the 2008 model year, warranty information and to provide GPS signal recovery steps (under Dealer Action heading) to do PRIOR to determining if the VIU/VCIM needs replacement. Please discard Corporate Bulletin Number 02-08-46-007B (Section 08 - Body & Accessories). If the vehicle currently has analog-upgradable OnStar(R) hardware, then the customer should be made aware of the digital upgrade program per the latest version of Service Bulletin # 05-08-46-006. Any analog OnStar system that is not upgraded prior to the end of 2007 will be deactivated due to the upcoming phase-out of the analog cellular network in the U.S. and Canada. If the vehicle has recently been upgraded or has had a service replacement unit installed, this bulletin may not be applicable. Certain 2001-2008 model year vehicles equipped with OnStar(R) may exhibit a condition with the Global Positioning System (GPS) that causes inaccuracies in the GPS clock. The GPS system is internal to the OnStar(R) Vehicle Interface Unit (VIU) or the Vehicle Communication Interface Module (VCIM). This inaccuracy can result in a symptom where the OnStar(R) Call Center is unable to obtain an accurate GPS signal, hands-Free Calling minutes expire prematurely and/or the inability to add Hands-Free calling minutes. Customer Notification OnStar(R) will notify the customer by mail with instructions to contact their dealership service department. Dealer Action Not all vehicles will require VIU/VCIM replacement. The GPS signal in some vehicles may be recoverable. To determine if the signal is recoverable, simply connect the Tech2(R) and using the GPS information data display option, observe the GPS date and time. If the date/time stamps are equal to a date approximately 19 years in the future, the GPS clock has exceeded its capacity and the VIU/VCIM will need to be replaced. If the date/time stamp is in the past or near future, the GPS clock has simply generated an inaccurate value and may be recoverable by performing the following power-up reset. To initiate a power-up reset, battery voltage (batt. +) must be removed from the VIU/VCIM. The preferred methods, in order, of initiating the reset are outlined below. Remove the fuse that supplies Battery positive (Batt. +) voltage to the module (refer to the applicable Service Information schematics for the appropriate fuse). The next preferred method is to remove the connector to the OnStar(R) unit that Batt + is contained. The least preferable method is to remove the negative terminal of the vehicle battery. This will not only initiate the power-up reset, but it may also result in the loss of radio presets and other stored personalization information/settings in other modules as well. After initiating the power-up reset, the GPS data will be set to the defaulted date and time and will require an acquisition of the GPS signal in order to gain the proper date and time. Acquiring the GPS signal requires running the vehicle in an open/unobstructed view of the sky. First, contact OnStar(R) Technical Support by pressing the blue button. Allow the OnStar(R) Technical Advisor to activate the GPS recovery process. This should take approximately 10 minutes. Continue to Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 02-08-46-007C > Nov > 07 > OnStar(R) - Loss of GPS Signal/Hands Free Issues > Page 152 monitor the Tech2(R) for the current time and date. REMINDER - Keep in mind that the time displayed on the Tech2(R) is in Greenwich Mean Time (GMT) and the offset is based on the time zones relationship to GMT. If replacement of the VIU/VCIM is necessary, you MUST reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair. OnStar® VIU, Generations 2 and 3, will require the technician to press the blue OnStar® button to reconfigure the vehicle with an OnStar® advisor. OnStar(R) VCIM, Generations 4-7 will require the technician to reconfigure the vehicle with the use of the TIS2WEB and SPS applications (pass thru only), along with the Tech2(R). The configuration and set-up procedure is a two-step process that must be completed step-by-step without interruption or delay in between each step. This procedure enables an automated activation without a button press by the technician to the OnStar(R) Call Center. Following this procedure, it may take up to 24 hours for all OnStar(R) services to be fully activated. How to Order Parts If the OnStar(R) GPS date/time stamp is non-recoverable and the unit needs to be replaced, dealers in the U.S. should contact Autocraft Electronics select the catalog item that contains this bulletin number. Canadian dealers should contact MASS Electronics. Dealers DO NOT need to call the GM Technical Assistance Center (TAC) for replacement approval. Autocraft Electronics and MASS Electronics will be responsible for verifying that the subject vehicle is a candidate for a replacement VIU/VCIM. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > Customer Interest: > 02-08-46-007C > Nov > 07 > OnStar(R) - Loss of GPS Signal/Hands Free Issues > Page 153 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-004C > Dec > 10 > OnStar(R) - Number Incorrect/Incorrectly Assigned Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Number Incorrect/Incorrectly Assigned INFORMATION Bulletin No.: 05-08-46-004C Date: December 23, 2010 Subject: OnStar(R) Phone Number Concerns (Phone Number Incorrect/Assigned to Another Vehicle/Phone) That Occur During Diagnosis of OnStar(R) System Models: 2000-2011 GM Passenger Cars and Trucks Equipped with OnStar(R) (RPO UE1) Supercede: This bulletin is being revised to update model years up to 2011. Please discard Corporate Bulletin Number 05-08-46-004B (Section 08 - Body and Accessories). During diagnosis of an OnStar(R) concern, the technician may be told that the OnStar(R) phone number is incorrect or tied to another vehicle and/or phone of some kind. To resolve these concerns, the Tech 2(R) with software version 22.005 (or higher), has the capability to change the OnStar(R) phone number. Service Procedure 1. With the Tech 2(R), build the vehicle to specifications within the Diagnostics area of the Tech 2(R). 2. For vehicles with physical-based diagnostics - under Body, go to the OnStar(R) section. Then select the Special Functions menu. For vehicles with functional-based diagnostics - under Body and Accessories, go to the Cellular Communication section. Select Module Setup and then Vehicle Communication Interface Module. 3. Locate the Program Phone Number prompt and select it. The original phone number will be displayed on the Tech 2(R) screen. 4. Contact the OnStar(R) team at the GM Technical Assistance Center (TAC) to obtain a new phone number. 5. Highlight the digits of the phone number one at a time and enter the new phone number using the number keys on the Tech 2(R). 6. Press the Soft key at the base of the screen for Done once these numbers have been changed on the screen. 7. Press the Soft key for Done again. The area code or new phone number has now been programmed into the phone. 8. Cycle the ignition to Off and open the driver's door. 9. Press the blue OnStar(R) button to make sure that a normal connection can be made to the OnStar(R) call center. If applicable, make sure the Hands-Free Calling (HFC) works properly by making a phone call. 10. If the system is working properly, fax or voicemail a case closing into the OnStar(R) team at TAC with the results. Dealers in Canada should submit case closing information through the GM infoNET. Please follow this diagnostic process thoroughly and complete each step. If the condition exhibited is resolved WITHOUT completing every step, the remaining steps do not need to be performed. If the procedure above does not resolve the condition, you must contact TAC for further assistance. This diagnostic approach was developed specifically for this condition and should not automatically be used for other vehicles with similar symptoms. Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-004C > Dec > 10 > OnStar(R) - Number Incorrect/Incorrectly Assigned > Page 159 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 02-08-44-007D > May > 09 > OnStar(R) - Negative Impact of Cloth/Vinyl Roofs Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Negative Impact of Cloth/Vinyl Roofs INFORMATION Bulletin No.: 02-08-44-007D Date: May 12, 2009 Subject: Negative Impact of Dealer-Installed Cloth/Vinyl Roofs on XM Radio and/or OnStar(R) Systems Models: 2002-2009 Passenger Cars and Trucks (Including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7X with XM Radio (RPO U2K) and/or OnStar(R) (RPO UE1) .............................................................................................................................................................. .................................................................................. Supercede: This bulletin is being revised to include the 2009 model year. Please discard Corporate Bulletin Number 02-08-44-007C (Section 08 - Body and Accessories). .............................................................................................................................................................. .................................................................................. Dealers should not install a cloth or vinyl roof on vehicles that have been ordered with the XM radio option (RPO U2K) and/or OnStar(R) (RPO UE1). The performance of these systems may be negatively impacted by the installation of the cloth/vinyl roof. Additionally, water leaks may result from installing a cloth or vinyl roof on vehicles with roof-mounted antenna systems. Relocating the antenna to another spot on the vehicle exterior, in order to install a cloth or vinyl roof, is not advised either. The performance of the OnStar(R) and XM Radio antennas has been optimized for their current locations. Relocating the antennas may result in a performance degradation. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 06-08-46-008C > Sep > 08 > OnStar(R) - Analog/Digital System Information Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Analog/Digital System Information INFORMATION Bulletin No.: 06-08-46-008C Date: September 18, 2008 Subject: Information on OnStar(R) Dual-Mode (Analog/Digital) Systems Models Supercede: This bulletin is being revised to correct the model year range for the Chevrolet Impala and Monte Carlo and update the reference to GM Dealerworld. Please discard Corporate Bulletin Number 06-08-46-008B (Section 08 - Body and Accessories). All 2000-2003 model year vehicles equipped with OnStar® from the list above were built with Analog/Digital-Ready OnStar(R) Hardware. Some of these vehicles may have been upgraded to Dual-Mode (Analog/Digital). Certain 2004-2005 model year vehicles equipped with OnStar(R) from the list above may have been either: ^ Originally built at the factory with Dual-Mode (Analog/Digital) OnStar(R) Hardware with Dual-Mode (Analog/Digital) OnStar(R) Hardware OR ^ Upgraded to Dual-Mode (Analog/Digital) Hardware All 2006 model year and newer vehicles equipped with OnStar(R) were built at the factory with Dual-Mode (Analog/Digital) OnStar(R) Hardware. If a vehicle has Dual-Mode (Analog/Digital) OnStar(R) Hardware, then the system is capable of operating on both the analog and digital cellular Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 06-08-46-008C > Sep > 08 > OnStar(R) - Analog/Digital System Information > Page 168 networks, and will not require an upgrade in connection with the cellular industry's transition to the digital network. In order to verify the type of OnStar(R) Hardware in a vehicle, type the VIN into the VIN look-up tool, which is available at the OnStar(R) Online Enrollment website within GM GlobalConnect (for U.S. dealers) or InfoNet (for Canadian dealers). Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 08-08-46-004 > Aug > 08 > OnStar(R) - Aftermarket Device Interference Information Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Aftermarket Device Interference Information INFORMATION Bulletin No.: 08-08-46-004 Date: August 14, 2008 Subject: Information on Aftermarket Device Interference with OnStar(R) Diagnostic Services Models: 2009 and Prior GM Passenger Car and Truck (including Saturn) 2009 and Prior HUMMER H2, H3 Models 2009 and Prior Saab 9-7X with OnStar(R) (RPO UE1) This bulletin is being issued to provide dealer service personnel with information regarding aftermarket devices connected to the Diagnostic Link Connector (DLC) and the impact to OnStar(R) diagnostic probes and Vehicle Diagnostic e-mails. Certain aftermarket devices, when connected to the Diagnostic Link Connector, such as, but not limited to, Scan Tools, Trip Computers, Fuel Economy Analyzers and Insurance Tracking Devices, interfere with OnStar's ability to perform a diagnostic probe when requested (via a blue button call) by a subscriber. These devices also prohibit the ability to gather diagnostic and tire pressure data for a subscriber's scheduled OnStar(R) Vehicle Diagnostic (OVD) e-mail. These aftermarket devices utilize the Vehicles serial data bus to perform data requests and/or information gathering. When these devices are requesting data, OnStar(R) is designed not to interfere with any data request being made by these devices as required by OBD II regulations. The OnStar(R) advisor is unable to definitively detect the presence of these devices and will only be able to inform the caller or requester of the unsuccessful or incomplete probe and may in some cases refer the subscriber/requester to take the vehicle to a dealer for diagnosis of the concern. When performing a diagnostic check for an unsuccessful or incomplete OnStar(R) diagnostic probe, or for concerns regarding completeness of the OnStar(R) Vehicle Diagnostic (OVD) e-mail, verify that an aftermarket device was not present at the time of the requested probe. Regarding the OVD e-mail, if an aftermarket device is interfering (including a Scan Tool of any type), the e-mail will consistently display a "yellow" indication in diagnostics section for all vehicle systems except the OnStar(R) System and Tire Pressure data (not available on all vehicles) will not be displayed (i.e. section is collapsed). Successful diagnostic probes and complete OVD e-mails will resume following the removal or disconnecting of the off-board device. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-001D > May > 08 > OnStar(R) - No Power/Inoperative/No LED Emergency Contact Module: All Technical Service Bulletins OnStar(R) - No Power/Inoperative/No LED TECHNICAL Bulletin No.: 05-08-46-001D Date: May 02, 2008 Subject: OnStar(R) Generation 5 or 6 (Digital) System Inoperative/Has No Power, LED Light Not On (Remove/Reinstall OnStar(R) Fuse and Replace VCIM or Follow SI Diagnostics) Models Supercede: This bulletin is being revised to update the information on VCIM ordering instructions in step 3 of the Correction statement. Please discard Corporate Bulletin Number 05-08-46-001C (Section 08 - Body & Accessories). Condition Some customers may comment any or all of the following conditions: ^ The OnStar(R) system may be inoperative. ^ The OnStar(R) system may have no power. ^ The OnStar(R) LED light may not be on. The technician may also not be able to communicate with the OnStar(R) Vehicle Communication Interface Module (VCIM) with a Tech 2(R). Correction Notice: On 2006 Chevrolet Impala and Monte Carlo models, make sure the ignition is OFF and the vehicle has "RAP"ed out prior to removing the OnStar(R) fuse. Disconnecting power to the OnStar(R) module while the ignition is ON may discharge and permanently damage the OnStar(R) back-up battery. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-001D > May > 08 > OnStar(R) - No Power/Inoperative/No LED > Page 177 Important: This bulletin does NOT apply to 2006 vehicles built AFTER the VIN breakpoints listed above. Refer to applicable diagnostics in SI for those vehicles that exhibit this condition. Remove the OnStar(R) fuse from the fuse box, wait five minutes and reinstall the fuse. (For Saturn VUE vehicles, remove the "INT LTS" fuse from the I/P fuse block for five minutes, then reinstall the fuse.) If the OnStar(R) system DOES NOT return to normal functionality, then follow the diagnostics in SI for this condition. If the OnStar(R) system DOES return to normal functionality, perform the following steps: 1. Install the Tech 2(R) and determine what generation hardware and software ID is in the vehicle. 2. If the vehicle is equipped with Generation 5 hardware and a software version 146, the VCIM should have the B1000 reprogramming performed as described in Corporate Bulletin Number 04-08-46-004A. The system should be tested and if the concern returns, the VCIM should be replaced. 3. If Gen 5 with a software version OTHER than 146 or Gen 6 and above, the VCIM needs to be replaced and the system reconfigured. Refer to the current version of Corporate Bulletin 03-08-46-004 for details on how to order a new VCIM. Important: As with any OnStar(R) VCIM replacement, the OnStar(R) system must be reconfigured after replacement. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 00-08-46-004C > Jan > 08 > OnStar(R) - Re-establishing OnStar(R) Communications Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Re-establishing OnStar(R) Communications Bulletin No.: 00-08-46-004C Date: January 17, 2008 INFORMATION Subject: Re-establishing Communications with OnStar(R) Center After Battery Disconnect Models: 2000-2008 GM Passenger Cars and Trucks (Including Saturn and Saab) with Digital OnStar(R) (RPO UE1) Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 00-08-46-004B (Section 08 - Body and Accessories). When servicing any of the above models and a battery cable is disconnected or power to the OnStar(R) Vehicle Communication Interface Module (VCIM) is interrupted for any reason the following procedure must be performed to verify proper Global Positioning System (GPS) function. Never swap OnStar(R) Vehicle Communication Interface Modules (VCIM) from other vehicles. Transfer of OnStar(R) modules from other vehicles should not be done. Each OnStar(R) module has a unique identification number. The VCIM has a specific Station Identification (STID). This identification number is used by the National Cellular Telephone Network and OnStar(R) systems and is stored in General Motors Vehicle History files by VIN. After completing ALL repairs to the vehicle you must perform the following procedure: Move the vehicle into an open area of the service lot. Sit in the vehicle with the engine running and the radio turned on for five minutes. Press the OnStar(R) button in the vehicle. When the OnStar(R) advisor answers ask the advisor to verify the current location of the vehicle. If the vehicle location is different than the location the OnStar(R) advisor gives contact GM Technical Assistance (TAC) and choose the OnStar(R) prompt. GM OnStar(R) TAC will assist in the diagnosis of a failed VCIM and, if appropriate, order a replacement part. Replacement parts are usually shipped out within 24 hours, and a pre-paid return package label will be included for returning the faulty part. By returning the faulty part, you will avoid a non-return core charge. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 02-08-46-006C > Jan > 08 > OnStar(R) - Incorrect GPS Position Reported During Call Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Incorrect GPS Position Reported During Call Bulletin No.: 02-08-46-006C Date: January 08, 2008 INFORMATION Subject: Incorrect OnStar(R) Global Positioning System (GPS) Location Reported During OnStar(R) Call Models: 2000-2008 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2008 Saab 9-7X with OnStar(R) Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 02-08-46-006B (Section 08 - Body and Accessories). A small number of the above-mentioned vehicles may exhibit a condition in which the vehicle reports an inaccurate location to the OnStar(R) Call Center. This condition can only be identified via a button press to the OnStar(R) Call Center by the customer. Call Center personnel will be able to identify this inaccurate location condition. Customers will then be notified through the mail by OnStar(R) if their vehicle exhibits this condition. Once this condition has been identified OnStar(R) will instruct the customer to return to the dealership to have this condition corrected. It is not necessary to reconfigure the vehicle after the following procedure. In order to correct this condition you must cycle power to the OnStar(R) system. This can be done by either removing the fuses powering the OnStar(R) system or disconnecting the OnStar(R) module (VCIM) from the vehicle. As a last resort you can disconnect the vehicle's battery. The power needs to be removed from the system for approximately 15 minutes. After completing this procedure the vehicle should be taken to an area with an unobstructed view of the sky. The vehicle should be kept running for approximately 10 minutes to allow the vehicle to reacquire the global positioning system (GPS). Then contact the OnStar(R) Call Center via the blue OnStar(R) button and ask the advisor to verify the GPS position. If the OnStar(R) advisor still has an inaccurate GPS location refer to the Navigation Systems and Cellular Communications sub-sections in the Service Manual in order to diagnose and repair the concern. If the normal diagnostics lead to module replacement you will need to contact Technical Assistance (TAC) and choose the OnStar(R) prompt. GM OnStar(R) TAC will assist in the diagnosis and if appropriate order a replacement part. Replacement parts are usually shipped out within 24 hours and a pre-paid return package label will be included for returning the faulty part. By returning the faulty part you will avoid a significant non-return core charge. Warranty Information (excluding Saab US Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab US Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 02-08-46-006C > Jan > 08 > OnStar(R) - Incorrect GPS Position Reported During Call > Page 186 For vehicles repaired under warranty use, the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 02-08-46-007C > Nov > 07 > OnStar(R) - Loss of GPS Signal/Hands Free Issues Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Loss of GPS Signal/Hands Free Issues Bulletin No.: 02-08-46-007C Date: November 19, 2007 INFORMATION Subject: Information on OnStar(R) System - Possible Loss of GPS Signal, Hands-Free Calling Minutes Expire Prematurely and/or Inability to Add Hands-Free Calling Minutes Models: 2001-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn) 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2008 Saab 9-7X with OnStar(R) System (RPO UE1) Supercede: This bulletin is being revised to add the 2008 model year, warranty information and to provide GPS signal recovery steps (under Dealer Action heading) to do PRIOR to determining if the VIU/VCIM needs replacement. Please discard Corporate Bulletin Number 02-08-46-007B (Section 08 - Body & Accessories). If the vehicle currently has analog-upgradable OnStar(R) hardware, then the customer should be made aware of the digital upgrade program per the latest version of Service Bulletin # 05-08-46-006. Any analog OnStar system that is not upgraded prior to the end of 2007 will be deactivated due to the upcoming phase-out of the analog cellular network in the U.S. and Canada. If the vehicle has recently been upgraded or has had a service replacement unit installed, this bulletin may not be applicable. Certain 2001-2008 model year vehicles equipped with OnStar(R) may exhibit a condition with the Global Positioning System (GPS) that causes inaccuracies in the GPS clock. The GPS system is internal to the OnStar(R) Vehicle Interface Unit (VIU) or the Vehicle Communication Interface Module (VCIM). This inaccuracy can result in a symptom where the OnStar(R) Call Center is unable to obtain an accurate GPS signal, hands-Free Calling minutes expire prematurely and/or the inability to add Hands-Free calling minutes. Customer Notification OnStar(R) will notify the customer by mail with instructions to contact their dealership service department. Dealer Action Not all vehicles will require VIU/VCIM replacement. The GPS signal in some vehicles may be recoverable. To determine if the signal is recoverable, simply connect the Tech2(R) and using the GPS information data display option, observe the GPS date and time. If the date/time stamps are equal to a date approximately 19 years in the future, the GPS clock has exceeded its capacity and the VIU/VCIM will need to be replaced. If the date/time stamp is in the past or near future, the GPS clock has simply generated an inaccurate value and may be recoverable by performing the following power-up reset. To initiate a power-up reset, battery voltage (batt. +) must be removed from the VIU/VCIM. The preferred methods, in order, of initiating the reset are outlined below. Remove the fuse that supplies Battery positive (Batt. +) voltage to the module (refer to the applicable Service Information schematics for the appropriate fuse). The next preferred method is to remove the connector to the OnStar(R) unit that Batt + is contained. The least preferable method is to remove the negative terminal of the vehicle battery. This will not only initiate the power-up reset, but it may also result in the loss of radio presets and other stored personalization information/settings in other modules as well. After initiating the power-up reset, the GPS data will be set to the defaulted date and time and will require an acquisition of the GPS signal in order to gain the proper date and time. Acquiring the GPS signal requires running the vehicle in an open/unobstructed view of the sky. First, contact OnStar(R) Technical Support by pressing the blue button. Allow the OnStar(R) Technical Advisor to activate the GPS recovery process. This should take approximately 10 minutes. Continue to Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 02-08-46-007C > Nov > 07 > OnStar(R) - Loss of GPS Signal/Hands Free Issues > Page 191 monitor the Tech2(R) for the current time and date. REMINDER - Keep in mind that the time displayed on the Tech2(R) is in Greenwich Mean Time (GMT) and the offset is based on the time zones relationship to GMT. If replacement of the VIU/VCIM is necessary, you MUST reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair. OnStar® VIU, Generations 2 and 3, will require the technician to press the blue OnStar® button to reconfigure the vehicle with an OnStar® advisor. OnStar(R) VCIM, Generations 4-7 will require the technician to reconfigure the vehicle with the use of the TIS2WEB and SPS applications (pass thru only), along with the Tech2(R). The configuration and set-up procedure is a two-step process that must be completed step-by-step without interruption or delay in between each step. This procedure enables an automated activation without a button press by the technician to the OnStar(R) Call Center. Following this procedure, it may take up to 24 hours for all OnStar(R) services to be fully activated. How to Order Parts If the OnStar(R) GPS date/time stamp is non-recoverable and the unit needs to be replaced, dealers in the U.S. should contact Autocraft Electronics select the catalog item that contains this bulletin number. Canadian dealers should contact MASS Electronics. Dealers DO NOT need to call the GM Technical Assistance Center (TAC) for replacement approval. Autocraft Electronics and MASS Electronics will be responsible for verifying that the subject vehicle is a candidate for a replacement VIU/VCIM. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 02-08-46-007C > Nov > 07 > OnStar(R) - Loss of GPS Signal/Hands Free Issues > Page 192 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Language Change Information Bulletin No.: 05-08-46-009B Date: June 29, 2007 INFORMATION Subject: Language Change for OnStar(R) System (U.S. and Canada Only) Models: 2006-2008 GM Passenger Cars and Light Duty Trucks (including Saturn) 2006-2008 HUMMER H2, H3 2006-2008 Saab 9-7X with OnStar(R) (RPO UE1) Built After and Including VIN Breakpoints Listed Below (2006 MY Only) Attention: This bulletin only applies to vehicles equipped with OnStar(R) Generation 6.1 or later with a Station Identification (STID) Number in the following range: 16,000,000-17,000,000 or 20,000,000-21,999,999 or 23,500,001-26,000,000 Supercede: This bulletin is being revised to update the service procedure and add a Canadian procedure. Please discard Corporate Bulletin Numbers 05-08-46-009A and 05-08-46-008A (Section 08 - Body and Accessories). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 197 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 198 Built After and Including the VIN Breakpoints shown. The Generation (Gen) 6.1 OnStar(R) system found in these vehicles has the capability to change the default English voice recognition to French or Spanish. Changing the language of the OnStar(R) system will change the following features to the language you select: Voice recognition command prompts will be played in the language selected. The voice recognition system will only recognize commands given in the selected language. Once completed, this process completely changes all voice recognition and voice commands of the OnStar(R) system. The process will need to be repeated in its entirety to change to a different language, including English. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 199 Method 1 Method 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 200 Method 3 The Gen 6.1 version of OnStar(R) does not require the use of the Service Programming System (SPS) to change the voice recognition system. However, there are three ways to change the language. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 02-08-44-007D > May > 09 > OnStar(R) - Negative Impact of Cloth/Vinyl Roofs Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Negative Impact of Cloth/Vinyl Roofs INFORMATION Bulletin No.: 02-08-44-007D Date: May 12, 2009 Subject: Negative Impact of Dealer-Installed Cloth/Vinyl Roofs on XM Radio and/or OnStar(R) Systems Models: 2002-2009 Passenger Cars and Trucks (Including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7X with XM Radio (RPO U2K) and/or OnStar(R) (RPO UE1) .............................................................................................................................................................. .................................................................................. Supercede: This bulletin is being revised to include the 2009 model year. Please discard Corporate Bulletin Number 02-08-44-007C (Section 08 - Body and Accessories). .............................................................................................................................................................. .................................................................................. Dealers should not install a cloth or vinyl roof on vehicles that have been ordered with the XM radio option (RPO U2K) and/or OnStar(R) (RPO UE1). The performance of these systems may be negatively impacted by the installation of the cloth/vinyl roof. Additionally, water leaks may result from installing a cloth or vinyl roof on vehicles with roof-mounted antenna systems. Relocating the antenna to another spot on the vehicle exterior, in order to install a cloth or vinyl roof, is not advised either. The performance of the OnStar(R) and XM Radio antennas has been optimized for their current locations. Relocating the antennas may result in a performance degradation. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 06-08-46-008C > Sep > 08 > OnStar(R) - Analog/Digital System Information Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Analog/Digital System Information INFORMATION Bulletin No.: 06-08-46-008C Date: September 18, 2008 Subject: Information on OnStar(R) Dual-Mode (Analog/Digital) Systems Models Supercede: This bulletin is being revised to correct the model year range for the Chevrolet Impala and Monte Carlo and update the reference to GM Dealerworld. Please discard Corporate Bulletin Number 06-08-46-008B (Section 08 - Body and Accessories). All 2000-2003 model year vehicles equipped with OnStar® from the list above were built with Analog/Digital-Ready OnStar(R) Hardware. Some of these vehicles may have been upgraded to Dual-Mode (Analog/Digital). Certain 2004-2005 model year vehicles equipped with OnStar(R) from the list above may have been either: ^ Originally built at the factory with Dual-Mode (Analog/Digital) OnStar(R) Hardware with Dual-Mode (Analog/Digital) OnStar(R) Hardware OR ^ Upgraded to Dual-Mode (Analog/Digital) Hardware All 2006 model year and newer vehicles equipped with OnStar(R) were built at the factory with Dual-Mode (Analog/Digital) OnStar(R) Hardware. If a vehicle has Dual-Mode (Analog/Digital) OnStar(R) Hardware, then the system is capable of operating on both the analog and digital cellular Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 06-08-46-008C > Sep > 08 > OnStar(R) - Analog/Digital System Information > Page 210 networks, and will not require an upgrade in connection with the cellular industry's transition to the digital network. In order to verify the type of OnStar(R) Hardware in a vehicle, type the VIN into the VIN look-up tool, which is available at the OnStar(R) Online Enrollment website within GM GlobalConnect (for U.S. dealers) or InfoNet (for Canadian dealers). Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 08-08-46-004 > Aug > 08 > OnStar(R) - Aftermarket Device Interference Information Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Aftermarket Device Interference Information INFORMATION Bulletin No.: 08-08-46-004 Date: August 14, 2008 Subject: Information on Aftermarket Device Interference with OnStar(R) Diagnostic Services Models: 2009 and Prior GM Passenger Car and Truck (including Saturn) 2009 and Prior HUMMER H2, H3 Models 2009 and Prior Saab 9-7X with OnStar(R) (RPO UE1) This bulletin is being issued to provide dealer service personnel with information regarding aftermarket devices connected to the Diagnostic Link Connector (DLC) and the impact to OnStar(R) diagnostic probes and Vehicle Diagnostic e-mails. Certain aftermarket devices, when connected to the Diagnostic Link Connector, such as, but not limited to, Scan Tools, Trip Computers, Fuel Economy Analyzers and Insurance Tracking Devices, interfere with OnStar's ability to perform a diagnostic probe when requested (via a blue button call) by a subscriber. These devices also prohibit the ability to gather diagnostic and tire pressure data for a subscriber's scheduled OnStar(R) Vehicle Diagnostic (OVD) e-mail. These aftermarket devices utilize the Vehicles serial data bus to perform data requests and/or information gathering. When these devices are requesting data, OnStar(R) is designed not to interfere with any data request being made by these devices as required by OBD II regulations. The OnStar(R) advisor is unable to definitively detect the presence of these devices and will only be able to inform the caller or requester of the unsuccessful or incomplete probe and may in some cases refer the subscriber/requester to take the vehicle to a dealer for diagnosis of the concern. When performing a diagnostic check for an unsuccessful or incomplete OnStar(R) diagnostic probe, or for concerns regarding completeness of the OnStar(R) Vehicle Diagnostic (OVD) e-mail, verify that an aftermarket device was not present at the time of the requested probe. Regarding the OVD e-mail, if an aftermarket device is interfering (including a Scan Tool of any type), the e-mail will consistently display a "yellow" indication in diagnostics section for all vehicle systems except the OnStar(R) System and Tire Pressure data (not available on all vehicles) will not be displayed (i.e. section is collapsed). Successful diagnostic probes and complete OVD e-mails will resume following the removal or disconnecting of the off-board device. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 00-08-46-004C > Jan > 08 > OnStar(R) - Re-establishing OnStar(R) Communications Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Re-establishing OnStar(R) Communications Bulletin No.: 00-08-46-004C Date: January 17, 2008 INFORMATION Subject: Re-establishing Communications with OnStar(R) Center After Battery Disconnect Models: 2000-2008 GM Passenger Cars and Trucks (Including Saturn and Saab) with Digital OnStar(R) (RPO UE1) Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 00-08-46-004B (Section 08 - Body and Accessories). When servicing any of the above models and a battery cable is disconnected or power to the OnStar(R) Vehicle Communication Interface Module (VCIM) is interrupted for any reason the following procedure must be performed to verify proper Global Positioning System (GPS) function. Never swap OnStar(R) Vehicle Communication Interface Modules (VCIM) from other vehicles. Transfer of OnStar(R) modules from other vehicles should not be done. Each OnStar(R) module has a unique identification number. The VCIM has a specific Station Identification (STID). This identification number is used by the National Cellular Telephone Network and OnStar(R) systems and is stored in General Motors Vehicle History files by VIN. After completing ALL repairs to the vehicle you must perform the following procedure: Move the vehicle into an open area of the service lot. Sit in the vehicle with the engine running and the radio turned on for five minutes. Press the OnStar(R) button in the vehicle. When the OnStar(R) advisor answers ask the advisor to verify the current location of the vehicle. If the vehicle location is different than the location the OnStar(R) advisor gives contact GM Technical Assistance (TAC) and choose the OnStar(R) prompt. GM OnStar(R) TAC will assist in the diagnosis of a failed VCIM and, if appropriate, order a replacement part. Replacement parts are usually shipped out within 24 hours, and a pre-paid return package label will be included for returning the faulty part. By returning the faulty part, you will avoid a non-return core charge. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information Emergency Contact Module: All Technical Service Bulletins OnStar(R) - Language Change Information Bulletin No.: 05-08-46-009B Date: June 29, 2007 INFORMATION Subject: Language Change for OnStar(R) System (U.S. and Canada Only) Models: 2006-2008 GM Passenger Cars and Light Duty Trucks (including Saturn) 2006-2008 HUMMER H2, H3 2006-2008 Saab 9-7X with OnStar(R) (RPO UE1) Built After and Including VIN Breakpoints Listed Below (2006 MY Only) Attention: This bulletin only applies to vehicles equipped with OnStar(R) Generation 6.1 or later with a Station Identification (STID) Number in the following range: 16,000,000-17,000,000 or 20,000,000-21,999,999 or 23,500,001-26,000,000 Supercede: This bulletin is being revised to update the service procedure and add a Canadian procedure. Please discard Corporate Bulletin Numbers 05-08-46-009A and 05-08-46-008A (Section 08 - Body and Accessories). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 223 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 224 Built After and Including the VIN Breakpoints shown. The Generation (Gen) 6.1 OnStar(R) system found in these vehicles has the capability to change the default English voice recognition to French or Spanish. Changing the language of the OnStar(R) system will change the following features to the language you select: Voice recognition command prompts will be played in the language selected. The voice recognition system will only recognize commands given in the selected language. Once completed, this process completely changes all voice recognition and voice commands of the OnStar(R) system. The process will need to be repeated in its entirety to change to a different language, including English. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 225 Method 1 Method 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Emergency Contact Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Emergency Contact Module: > 05-08-46-009B > Jun > 07 > OnStar(R) - Language Change Information > Page 226 Method 3 The Gen 6.1 version of OnStar(R) does not require the use of the Service Programming System (SPS) to change the voice recognition system. However, there are three ways to change the language. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Locations Global Positioning System Module: Locations Vehicle Communication Interface Module (VCIM) - Short Wheelbase (SWB) Vehicle Communication Interface Module (VCIM) - Long Wheelbase (LWB) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Locations > Page 230 Global Positioning System Module: Diagrams Vehicle Communication Interface Module (VCIM) C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Locations > Page 231 Vehicle Communication Interface Module (VCIM) C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Service and Repair > Communication Interface Module Replacement (Trailblazer EXT, Envoy XL) Global Positioning System Module: Service and Repair Communication Interface Module Replacement (Trailblazer EXT, Envoy XL) COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER EXT, ENVOY XL) REMOVAL PROCEDURE 1. Fold and tumble the right second row seat to a cargo position. IMPORTANT: Do not exchange the vehicle communication interface module with other vehicles. Each vehicle communication interface module has a specific station identification (STID) and electronic serial number (ESN). These identification numbers are stored in the General Motors vehicle history files by VIN and used by OnStar(R) and the National Cellular Telephone Network. 2. Remove the protective cover (1) from the vehicle communication interface module (VCIM). 3. Remove the VCIM from the bracket by releasing the retaining tab (1). 4. Remove the electrical connectors from the VCIM. 5. Remove the VCIM from the vehicle. INSTALLATION PROCEDURE 1. If replacing the VCIM, record the 10-digit STID number, and the 11-digit ESN number from the labels on the new module. 2. Position the VCIM near the mounting location. 3. Install the quick connector to the VCIM. 4. Install the remaining electrical connectors to the VCIM. 5. Install the VCIM (1) to the bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Service and Repair > Communication Interface Module Replacement (Trailblazer EXT, Envoy XL) > Page 234 6. Ensure the retaining tab (1) is fully seated. 7. Install the protective cover (1) to the module. 8. Position the right second row seat to a passenger position. 9. Install the scan tool. Use the special functions menu in order to perform the OnStar(R) setup procedure for this vehicle. IMPORTANT: After replacing the vehicle communication interface module, you must reconfigure the OnStar(R) system. Failure to reconfigure the system will result in an additional customer visit for repair. In addition, pressing and holding the white dot button on the keypad will NOT reset this version of the OnStar(R) system. This action will cause a DTC to set. 10. Move the vehicle to an open area that is away from tall buildings and with a clear view of unobstructed sky. Allow the vehicle to run for 10 minutes. 11. Use the ID information menu on the scan tool to access the new station ID (STID) and the electronic serial number (ESN) from the new VCIM. 12. Press the blue OnStar(R) button to connect to the OnStar(R) Call Center and perform the following procedure: 1. Tell the advisor that this vehicle has received a new VCIM. 2. Ask the advisor to add the new STID and the ESN to update the customers account. 3. Follow any additional instructions from the OnStar(R) advisor. 4. Ask the advisor to activate the OnStar(R) Personal Calling feature, if available. 13. Refer to Control Module References for programming and setup information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Service and Repair > Communication Interface Module Replacement (Trailblazer EXT, Envoy XL) > Page 235 Global Positioning System Module: Service and Repair Communication Interface Module Replacement COMMUNICATION INTERFACE MODULE REPLACEMENT REMOVAL PROCEDURE 1. Position the right rear seat bottom to a cargo position. IMPORTANT: The vehicle communication interface module (VCIM) has a specific set of unique numbers that tie the module to each vehicle. These numbers, the 10-digit station identification and the 11-digit electronic serial number, are used by the National Cellular Network and OnStar(R) to identify the specific vehicle. Because these numbers are tied to the vehicle identification number of the vehicle, you must never exchange these parts with those of another vehicle. 2. Remove the protective cover from the VCIM. 3. Remove the module from the upper bracket by releasing the retaining tab. 4. Remove the electrical connectors from the VCIM. 5. Remove the VCIM from the vehicle. INSTALLATION PROCEDURE 1. If replacing the VCIM, record the 10-digit STID number, and the 11-digit ESN number from the labels on the new module. 2. Install the module to the upper bracket ensuring the retaining tab is fully seated. 3. Connect the 2 electrical connectors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Global Positioning System Module > Component Information > Service and Repair > Communication Interface Module Replacement (Trailblazer EXT, Envoy XL) > Page 236 Tighten the module thumb screw to a maximum of 0.2 N.m (2 lb in). NOTE: In order to avoid damage to the circuit board, do NOT over-tighten the thumb screws. Using your fingers, apply only a light pressure. 4. Install the protective cover to the module. 5. Position the right rear seat bottom to a passenger position. 6. Install the scan tool. Use the special functions menu in order to perform the OnStar(R) setup procedure for this vehicle. IMPORTANT: After replacing the vehicle communication interface module, you must reconfigure the OnStar(R) system. Failure to reconfigure the system will result in an additional customer visit for repair. In addition, pressing and holding the white dot button on the keypad will NOT reset this version of the OnStar(R) system. This action will cause a DTC to set. 7. Move the vehicle to an open area that is away from tall buildings and with a clear view of unobstructed sky. Allow the vehicle to run for 10 minutes. 8. Use the ID information menu on the scan tool to access the new station ID (STID) and the electronic serial number (ESN) from the new VCIM. 9. Press the blue OnStar(R) button to connect to the OnStar(R) Call Center and perform the following procedure: 1. Tell the advisor that this vehicle has received a new VCIM. 2. Ask the advisor to add the new STID and the ESN to update the customer's account. 3. Follow any additional instructions from the OnStar(R) advisor. 4. Ask the advisor to activate the OnStar(R) Personal Calling feature, if available. 10. Refer to Control Module References for programming and setup information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer Interest for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules Relay Module: Customer Interest Electrical - MIL ON/DTC's Set By Various Control Modules TECHNICAL Bulletin No.: 09-06-03-004D Date: December 08, 2010 Subject: Intermittent No Crank/No Start, No Module Communication, MIL, Warning Lights, Vehicle Messages or DTCs Set by Various Control Modules - Diagnosing and Repairing Fretting Corrosion (Disconnect Affected Connector and Apply Dielectric Lubricant) Models: 2011 and Prior GM Passenger Cars and Trucks Attention: This repair can be applied to ANY electrical connection including, but not limited to: lighting, body electrical, in-line connections, powertrain control sensors, etc. DO NOT over apply lubricant to the point where it prevents the full engagement of sealed connectors. A light coating on the terminal surfaces is sufficient to correct the condition. Supercede: This bulletin is being revised to update the Attention statement and add the 2011 model year. Please discard Corporate Bulletin Number 09-06-03-004C (Section 06 Engine/Propulsion System). Condition Some customers may comment on any of the following conditions: - An intermittent no crank/no start - Intermittent malfunction indicator lamp (MIL) illumination - Intermittent service lamp illumination - Intermittent service message(s) being displayed The technician may determine that he is unable to duplicate the intermittent condition. Cause This condition may be caused by a buildup of nonconductive insulating oxidized debris known as fretting corrosion, occurring between two electrical contact surfaces of the connection or connector. This may be caused by any of the following conditions: - Vibration - Thermal cycling - Poor connection/terminal retention - Micro motion - A connector, component or wiring harness not properly secured resulting in movement On low current signal circuits this condition may cause high resistance, resulting in intermittent connections. On high current power circuits this condition may cause permanent increases in the resistance and may cause a device to become inoperative. Representative List of Control Modules and Components The following is only a representative list of control modules and components that may be affected by this connection or connector condition and DOES NOT include every possible module or component for every vehicle. - Blower Control Module - Body Control Module (BCM) - Communication Interface Module (CIM) - Cooling Fan Control Module - Electronic Brake Control Module (EBCM) - Electronic Brake and Traction Control Module (EBTCM) - Electronic Suspension Control (ESC) Module - Engine Control Module (ECM) - Heating, Ventilation and Air Conditioning (HVAC) Control Module Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer Interest for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 245 - HVAC Actuator - Inflatable Restraint Sensing and Diagnostic Module (SDM) - Any AIR BAG module - Seatbelt Lap Anchor Pretensioner - Seatbelt Retractor Pretensioner - An SIR system connection or connector condition resulting in the following DTCs being set: B0015, B0016, B0019, B0020, B0022, or B0023 - Powertrain Control Module (PCM) - Remote Control Door Lock Receiver (RCDLR) - Transmission Control Module (TCM) Correction Important DO NOT replace the control module, wiring or component for the following conditions: - The condition is intermittent and cannot be duplicated. - The condition is present and by disconnecting and reconnecting the connector the condition can no longer be duplicated. Use the following procedure to correct the conditions listed above. 1. Install a scan tool and perform the Diagnostic System Check - Vehicle. Retrieve and record any existing history or current DTCs from all of the control modules (refer to SI). ‹› If any DTC(s) are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). ‹› If DTCs are not set, refer to Symptoms - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). 2. When identified, use the appropriate DTC Diagnostics, Symptoms, Schematics, Component Connector End Views and Component Locator documents to locate and disconnect the affected harness connector(s) which are causing the condition. Note Fretting corrosion looks like little dark smudges on electrical terminals and appear where the actual electrical contact is being made. In less severe cases it may be unable to be seen or identified without the use of a magnifying glass. Important DO NOT apply an excessive amount of dielectric lubricant to the connectors as shown, as hydrolock may result when attempting to mate the connectors. Use ONLY a clean nylon brush that is dedicated to the repair of the conditions in this bulletin. 3. With a one-inch nylon bristle brush, apply dielectric lubricant to both the module/component side and the harness side of the affected connector(s). 4. Reconnect the affected connector(s) and wipe away any excess lubricant that may be present. 5. Attempt to duplicate the condition by using the following information: - DTC Diagnostic Procedure - Circuit/System Description - Conditions for Running the DTC - Conditions for Setting the DTC - Diagnostic Aids - Circuit/System Verification ‹› If the condition cannot be duplicated, the repair is complete. ‹› If the condition can be duplicated, then follow the appropriate DTC, Symptom or Circuit/System Testing procedure (refer to SI). Repair Order Documentation Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer Interest for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 246 Important The following information MUST be documented on the repair order. Failure to do so may result in a chargeback. - Customer vehicle condition. - Was a Service Lamp or Service Message illuminated? If yes, specify which Service Lamp or Service Message. - Was a DTC(s) set? If yes, specify which DTC(s) were set. - After following the procedure contained within this bulletin, could the condition be duplicated? ‹› If the condition was not duplicated, then document the affected module/component connector name and number on the repair order. - If the condition was duplicated after the procedure contained within this bulletin was followed, and additional diagnosis led to the replacement of a module or component, the SI Document ID Number MUST be written on the repair order. Parts Information Alternate Distributor For All of North America Note NyoGel(R) 760G Lubricant* is equivalent to GMSPO P/N 12377900, and P/N 10953529 (Canada), specified for use to correct the condition in this bulletin. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to: Warranty Information (Saab Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > Customer Interest for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 247 For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to refer to the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules Relay Module: All Technical Service Bulletins Electrical - MIL ON/DTC's Set By Various Control Modules TECHNICAL Bulletin No.: 09-06-03-004D Date: December 08, 2010 Subject: Intermittent No Crank/No Start, No Module Communication, MIL, Warning Lights, Vehicle Messages or DTCs Set by Various Control Modules - Diagnosing and Repairing Fretting Corrosion (Disconnect Affected Connector and Apply Dielectric Lubricant) Models: 2011 and Prior GM Passenger Cars and Trucks Attention: This repair can be applied to ANY electrical connection including, but not limited to: lighting, body electrical, in-line connections, powertrain control sensors, etc. DO NOT over apply lubricant to the point where it prevents the full engagement of sealed connectors. A light coating on the terminal surfaces is sufficient to correct the condition. Supercede: This bulletin is being revised to update the Attention statement and add the 2011 model year. Please discard Corporate Bulletin Number 09-06-03-004C (Section 06 Engine/Propulsion System). Condition Some customers may comment on any of the following conditions: - An intermittent no crank/no start - Intermittent malfunction indicator lamp (MIL) illumination - Intermittent service lamp illumination - Intermittent service message(s) being displayed The technician may determine that he is unable to duplicate the intermittent condition. Cause This condition may be caused by a buildup of nonconductive insulating oxidized debris known as fretting corrosion, occurring between two electrical contact surfaces of the connection or connector. This may be caused by any of the following conditions: - Vibration - Thermal cycling - Poor connection/terminal retention - Micro motion - A connector, component or wiring harness not properly secured resulting in movement On low current signal circuits this condition may cause high resistance, resulting in intermittent connections. On high current power circuits this condition may cause permanent increases in the resistance and may cause a device to become inoperative. Representative List of Control Modules and Components The following is only a representative list of control modules and components that may be affected by this connection or connector condition and DOES NOT include every possible module or component for every vehicle. - Blower Control Module - Body Control Module (BCM) - Communication Interface Module (CIM) - Cooling Fan Control Module - Electronic Brake Control Module (EBCM) - Electronic Brake and Traction Control Module (EBTCM) - Electronic Suspension Control (ESC) Module - Engine Control Module (ECM) - Heating, Ventilation and Air Conditioning (HVAC) Control Module Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 253 - HVAC Actuator - Inflatable Restraint Sensing and Diagnostic Module (SDM) - Any AIR BAG module - Seatbelt Lap Anchor Pretensioner - Seatbelt Retractor Pretensioner - An SIR system connection or connector condition resulting in the following DTCs being set: B0015, B0016, B0019, B0020, B0022, or B0023 - Powertrain Control Module (PCM) - Remote Control Door Lock Receiver (RCDLR) - Transmission Control Module (TCM) Correction Important DO NOT replace the control module, wiring or component for the following conditions: - The condition is intermittent and cannot be duplicated. - The condition is present and by disconnecting and reconnecting the connector the condition can no longer be duplicated. Use the following procedure to correct the conditions listed above. 1. Install a scan tool and perform the Diagnostic System Check - Vehicle. Retrieve and record any existing history or current DTCs from all of the control modules (refer to SI). ‹› If any DTC(s) are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). ‹› If DTCs are not set, refer to Symptoms - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). 2. When identified, use the appropriate DTC Diagnostics, Symptoms, Schematics, Component Connector End Views and Component Locator documents to locate and disconnect the affected harness connector(s) which are causing the condition. Note Fretting corrosion looks like little dark smudges on electrical terminals and appear where the actual electrical contact is being made. In less severe cases it may be unable to be seen or identified without the use of a magnifying glass. Important DO NOT apply an excessive amount of dielectric lubricant to the connectors as shown, as hydrolock may result when attempting to mate the connectors. Use ONLY a clean nylon brush that is dedicated to the repair of the conditions in this bulletin. 3. With a one-inch nylon bristle brush, apply dielectric lubricant to both the module/component side and the harness side of the affected connector(s). 4. Reconnect the affected connector(s) and wipe away any excess lubricant that may be present. 5. Attempt to duplicate the condition by using the following information: - DTC Diagnostic Procedure - Circuit/System Description - Conditions for Running the DTC - Conditions for Setting the DTC - Diagnostic Aids - Circuit/System Verification ‹› If the condition cannot be duplicated, the repair is complete. ‹› If the condition can be duplicated, then follow the appropriate DTC, Symptom or Circuit/System Testing procedure (refer to SI). Repair Order Documentation Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 254 Important The following information MUST be documented on the repair order. Failure to do so may result in a chargeback. - Customer vehicle condition. - Was a Service Lamp or Service Message illuminated? If yes, specify which Service Lamp or Service Message. - Was a DTC(s) set? If yes, specify which DTC(s) were set. - After following the procedure contained within this bulletin, could the condition be duplicated? ‹› If the condition was not duplicated, then document the affected module/component connector name and number on the repair order. - If the condition was duplicated after the procedure contained within this bulletin was followed, and additional diagnosis led to the replacement of a module or component, the SI Document ID Number MUST be written on the repair order. Parts Information Alternate Distributor For All of North America Note NyoGel(R) 760G Lubricant* is equivalent to GMSPO P/N 12377900, and P/N 10953529 (Canada), specified for use to correct the condition in this bulletin. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to: Warranty Information (Saab Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Relay Module: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 255 For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to refer to the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label Door Lock Relay: Locations Fuse Block - Rear (Short Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 261 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 262 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 263 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 264 Door Lock Relay: Locations Fuse Block - Rear (Long Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 265 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 266 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Lock Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 267 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) Door Module: Diagrams Driver Door Module (DDM) Driver Door Module (DDM) C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) > Page 272 Driver Door Module (DDM) C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) > Page 273 Driver Door Module (DDM) C3 (Outside Rearview Mirror - Driver) (With RPO Code DS3/DL2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) > Page 274 Driver Door Module (DDM) C4 (Memory Seat Switch - Driver) (Without Memory) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) > Page 275 Driver Door Module (DDM) C5 (Outside Rearview Mirror Switch) (With RPO Code DS3/DL2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) > Page 276 Door Module: Diagrams Front Passenger Door Module (FPDM) Front Passenger Door Module (FPDM) C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) > Page 277 Front Passenger Door Module (FPDM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Door Module > Component Information > Diagrams > Driver Door Module (DDM) > Page 278 Front Passenger Door Module (FPDM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Memory Positioning Module > Component Information > Diagrams Memory Positioning Module: Diagrams Memory Seat Module - Driver C1 (w/Memory) Memory Seat Module - Driver C2 (w/Memory) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Memory Positioning Module > Component Information > Diagrams > Page 282 Memory Seat Module - Driver C3 (w/Memory) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Memory Positioning Module > Component Information > Diagrams > Page 283 Memory Seat Module - Driver C4 (w/Memory) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Memory Positioning Module > Component Information > Diagrams > Page 284 Memory Positioning Module: Service and Repair MEMORY SEAT CONTROL MODULE REPLACEMENT REMOVAL PROCEDURE 1. Remove the 3 seat switch bezel screws. 2. Remove 4/ nuts that attach the seat pan to the seat assembly. 3. Remove the clip from the front outboard seat pan stud. Discard the clip. 4. Lift the seat pan up in order to allow access to the seat control module retaining screw. 5. Remove the seat control module retaining screw. 6. Disconnect the electrical connectors from the seat control module as necessary. 7. Remove the seat control module from the seat assembly. INSTALLATION PROCEDURE 1. Align and install the locating tabs on the seat control module with the seat pan. 2. Connect the electrical connectors to the seat control module as necessary. 3. Install the screw that retains the seat control module to the seat pan. NOTE: Refer to Fastener Notice . Tighten the screw to 3 N.m (26 lb in). 4. Install the seat pan to the seat assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Memory Positioning Module > Component Information > Diagrams > Page 285 5. Install the nuts which retain the seat pan to the seat assembly. Tighten the nuts to 25 N.m (18 lb ft). 6. Install the 3 seat switch bezel screws. 7. Calibrate the seat. Refer to Memory Seat Calibration Procedure . 8. Refer to Control Module References for programming and setup information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Pedal Positioning Relay > Component Information > Locations Lower LF Of The Passenger Compartment - Pedal Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Pedal Positioning Relay > Component Information > Locations > Page 289 Electronic Adjustable Pedals (EAP) Relay Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Technical Service Bulletins > Recalls for Power Seat Control Module: > 06022 > Mar > 06 > Campaign - Driver's Seat Module Programming Power Seat Control Module: Recalls Campaign - Driver's Seat Module Programming Subject: Product Enhancement for Inventory and Customer Vehicles - Drivers Seat Module Reprogram-Expires with Base Warranty # 06022 - (03/23/2006) Models: 2006 Buick Rainier 2006 Chevrolet TrailBlazer, TrailBlazer EXT 2006 GMC Envoy, Envoy XL 2006 Saab 9-7X with Memory Seats (RPO AAB/YC5/YC6) and OnStar(R) (RPO UEI) THIS PRODUCT ENHANCEMENT INCLUDES VEHICLES IN DEALER INVENTORY AND CUSTOMER VEHICLES THAT RETURN FOR ANY TYPE OF SERVICE, AND WILL EXPIRE AT THE END OF THE INVOLVED VEHICLE'S NEW VEHICLE LIMITED WARRANTY PERIOD. Purpose This bulletin provides a service procedure to reprogram the driver's seat module on certain 2006 Buick Rainier; Chevrolet TrailBlazer and TrailBlazer EXT; GMC Envoy and Envoy XL, and Saab 9 7X vehicles equipped with memory seats (RPO AAB/YC5/YC6) and OnStar(R) (RPO UE1). On rare occasions, at vehicle start-up, these vehicles may have an extended bulb check and the XM Satellite Radio may take a few seconds longer to activate. The heated seats, door locks, and power windows may also be inoperative until the key is removed from the ignition. This reprogramming should be completed as soon as possible on involved vehicles currently in dealership/retailer inventory and customer vehicles that return to the dealer/retailer for any type of service during the New Vehicle Limited Warranty coverage period. Vehicles Involved Service Procedure Notice: Before reprogramming, please check the battery condition to prevent a reprogram error of the driver's seat module due to battery discharge. Battery voltage must be between 12 and 16 volts during reprogramming. If the vehicle battery is not fully charged, use jumper cables from an additional battery. Be sure to turn off or disable any system that may put a load on the battery such as automatic headlamps, daytime running lamps, interior lights, heating, ventilation, and air conditioning (HVAC) system, radio, engine cooling fan, etc. A programming failure or control module damage Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Technical Service Bulletins > Recalls for Power Seat Control Module: > 06022 > Mar > 06 > Campaign - Driver's Seat Module Programming > Page 298 may occur if battery voltage guidelines are not observed. The ignition switch must be in the proper position. The Tech 2(R) prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure unless instructed to do so. Make certain all tool connections are secure, including the following components and circuits: ^ The control module serial data link tester ^ The RS-232 communication cable port ^ The connection at the data link connector (DLC) ^ The voltage supply circuits DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur. DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date. Program the driver's seat module (DSM) to the latest calibration part number. Be sure to use the Pass Thru programming method using both the Tech 2(R) with CANDi module and the TIS terminal. Important: Use data version 2.5 or later, broadcast to dealers on February 20, 2006 (US), February 22, 2006 (Canada), and on TIS CD-ROM Version 3.0/2006, mailed to dealers beginning March 15, 2006. To complete this service procedure, the Tech 2(R) must also be updated to release 26.002 or greater. If you cannot access the calibration, call the Techline Customer Support Center. 1. Connect the Tech 2(R) to the vehicle and the TIS terminal. 2. Turn the ignition to ON with the engine OFF. 3. After all warning chimes inside the vehicle have stopped, turn on the Tech 2(R). 4. On the TIS terminal, go into SPS Programming. 5. Select Pass Thru Programming. 6. Follow the instructions on the TIS terminal, when you get to the Supported Controllers Screen, do the following: 6.1 Scroll down in the top box and select DSM, Drivers Seat Module. 6.2 In the middle box, select Program ECU. 6.3 In the lower box, select Normal. 6.4. Select Next. 7. Select the correct option for heated or non heated seats. 8. When the calibration screen comes up, select the latest, and select Next. 9. Follow the on-screen prompts until programming is completed. 10. When programming is complete, do the following: 10.1. Turn the Tech 2(R) off. 10.2 Turn the ignition switch to OFF. 11. Wait 30 seconds. 12. Turn the ignition switch to ON with the engine OFF. Important: The next steps must be performed in order to dear DTCs set during programming. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Technical Service Bulletins > Recalls for Power Seat Control Module: > 06022 > Mar > 06 > Campaign - Driver's Seat Module Programming > Page 299 13. Turn the Tech 2(R) on. 14. Go into Diagnostics and check for DTC codes. 15. Clear all codes. 16. The programming is complete. Claim Information -- GM and Saab Canada Only Claim Information -- Saab US Only Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Seat Control Module: > 06022 > Mar > 06 > Campaign - Driver's Seat Module Programming Power Seat Control Module: All Technical Service Bulletins Campaign - Driver's Seat Module Programming Subject: Product Enhancement for Inventory and Customer Vehicles - Drivers Seat Module Reprogram-Expires with Base Warranty # 06022 - (03/23/2006) Models: 2006 Buick Rainier 2006 Chevrolet TrailBlazer, TrailBlazer EXT 2006 GMC Envoy, Envoy XL 2006 Saab 9-7X with Memory Seats (RPO AAB/YC5/YC6) and OnStar(R) (RPO UEI) THIS PRODUCT ENHANCEMENT INCLUDES VEHICLES IN DEALER INVENTORY AND CUSTOMER VEHICLES THAT RETURN FOR ANY TYPE OF SERVICE, AND WILL EXPIRE AT THE END OF THE INVOLVED VEHICLE'S NEW VEHICLE LIMITED WARRANTY PERIOD. Purpose This bulletin provides a service procedure to reprogram the driver's seat module on certain 2006 Buick Rainier; Chevrolet TrailBlazer and TrailBlazer EXT; GMC Envoy and Envoy XL, and Saab 9 7X vehicles equipped with memory seats (RPO AAB/YC5/YC6) and OnStar(R) (RPO UE1). On rare occasions, at vehicle start-up, these vehicles may have an extended bulb check and the XM Satellite Radio may take a few seconds longer to activate. The heated seats, door locks, and power windows may also be inoperative until the key is removed from the ignition. This reprogramming should be completed as soon as possible on involved vehicles currently in dealership/retailer inventory and customer vehicles that return to the dealer/retailer for any type of service during the New Vehicle Limited Warranty coverage period. Vehicles Involved Service Procedure Notice: Before reprogramming, please check the battery condition to prevent a reprogram error of the driver's seat module due to battery discharge. Battery voltage must be between 12 and 16 volts during reprogramming. If the vehicle battery is not fully charged, use jumper cables from an additional battery. Be sure to turn off or disable any system that may put a load on the battery such as automatic headlamps, daytime running lamps, interior lights, heating, ventilation, and air conditioning (HVAC) system, radio, engine cooling fan, etc. A programming failure or control module damage Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Seat Control Module: > 06022 > Mar > 06 > Campaign - Driver's Seat Module Programming > Page 305 may occur if battery voltage guidelines are not observed. The ignition switch must be in the proper position. The Tech 2(R) prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure unless instructed to do so. Make certain all tool connections are secure, including the following components and circuits: ^ The control module serial data link tester ^ The RS-232 communication cable port ^ The connection at the data link connector (DLC) ^ The voltage supply circuits DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur. DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date. Program the driver's seat module (DSM) to the latest calibration part number. Be sure to use the Pass Thru programming method using both the Tech 2(R) with CANDi module and the TIS terminal. Important: Use data version 2.5 or later, broadcast to dealers on February 20, 2006 (US), February 22, 2006 (Canada), and on TIS CD-ROM Version 3.0/2006, mailed to dealers beginning March 15, 2006. To complete this service procedure, the Tech 2(R) must also be updated to release 26.002 or greater. If you cannot access the calibration, call the Techline Customer Support Center. 1. Connect the Tech 2(R) to the vehicle and the TIS terminal. 2. Turn the ignition to ON with the engine OFF. 3. After all warning chimes inside the vehicle have stopped, turn on the Tech 2(R). 4. On the TIS terminal, go into SPS Programming. 5. Select Pass Thru Programming. 6. Follow the instructions on the TIS terminal, when you get to the Supported Controllers Screen, do the following: 6.1 Scroll down in the top box and select DSM, Drivers Seat Module. 6.2 In the middle box, select Program ECU. 6.3 In the lower box, select Normal. 6.4. Select Next. 7. Select the correct option for heated or non heated seats. 8. When the calibration screen comes up, select the latest, and select Next. 9. Follow the on-screen prompts until programming is completed. 10. When programming is complete, do the following: 10.1. Turn the Tech 2(R) off. 10.2 Turn the ignition switch to OFF. 11. Wait 30 seconds. 12. Turn the ignition switch to ON with the engine OFF. Important: The next steps must be performed in order to dear DTCs set during programming. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Seat Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Seat Control Module: > 06022 > Mar > 06 > Campaign - Driver's Seat Module Programming > Page 306 13. Turn the Tech 2(R) on. 14. Go into Diagnostics and check for DTC codes. 15. Clear all codes. 16. The programming is complete. Claim Information -- GM and Saab Canada Only Claim Information -- Saab US Only Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Trunk / Liftgate Control Module > Component Information > Technical Service Bulletins > Body Controls - Liftgate Module Diagnostic Information Power Trunk / Liftgate Control Module: Technical Service Bulletins Body Controls - Liftgate Module Diagnostic Information Bulletin No.: 06-08-66-014 Date: November 06, 2006 INFORMATION Subject: Diagnostic Information When Servicing Liftgate Module Models: 2006 Buick Rainier 2006 Chevrolet TrailBlazer 2006 GMC Envoy Technicians should be aware that 2004 liftgate modules (LGM) may be found in some 2006 model year vehicles. The supplier modified the software to work on the 2006 model year vehicles with the 2004 model year hardware. This bulletin is to instruct Technicians of the recommended actions to take to diagnose this part in service. If a vehicle comes in for service, the Technician may replace the component with the appropriate current service part number. The Tech 2(R) will be able to read the base part number when an LGM needs programming and will be able to determine the part installed. Do not attempt to reprogram a 2004 MY LGM with a 2006 MY calibration. Doing so may cause the following conditions: Improper communication Rear Wiper Delay 1 Delay 2 will not work properly. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Trunk / Liftgate Control Module > Component Information > Technical Service Bulletins > Page 311 Power Trunk / Liftgate Control Module: Diagrams Liftgate Module (LGM) C1 Liftgate Module (LGM) C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Trunk / Liftgate Control Module > Component Information > Technical Service Bulletins > Page 312 Liftgate Module (LGM) C3 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Power Trunk / Liftgate Control Module > Component Information > Technical Service Bulletins > Page 313 Power Trunk / Liftgate Control Module: Service and Repair LIFTGATE CONTROL MODULE REPLACEMENT REMOVAL PROCEDURE 1. Remove the liftgate trim panel. 2. Disconnect the electrical connectors (3) from the module as necessary. 3. Remove the bolts that retain the module to the liftgate. 4. Remove the module from the liftgate. INSTALLATION PROCEDURE 1. Install the module to the liftgate. 2. Install the bolts that retain the module to the liftgate. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolts to 10 N.m (89 lb in). 3. Connect the electrical connectors (3) as necessary. 4. Install the liftgate trim panel. 5. Program the liftgate control module. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set Electronic Brake Control Module: Customer Interest Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set TECHNICAL Bulletin No.: 04-05-25-002E Date: March 11, 2009 Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) Models Supercede: This bulletin is being revised to add step 2 to the procedure and update the Parts and Warranty Information. Please discard Corporate Bulletin Number 04-05-25-002D (Section 05 - Brakes). Condition Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module. Cause A poor connection at the EBCM ground is causing unnecessary replacement of brake modules. Important: The EBCM ground is different for each application. Refer to the list below for the proper ground reference: ^ Midsize Utilities = Ground 304 ^ SSR = Ground 400 ^ Fullsize Trucks and Utilities = Ground 110 Correction Important: Do not replace the brake module to correct this condition. Perform the following repair before further diagnosis of the EBCM. Perform the following steps to improve the connection of the EBCM Ground: 1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire. 2. If the original fastener has a welded on nut, remove the nut from the frame, and if required, enlarge the bolt hole to accommodate the new bolt and nut. 3. Clean the area, front and back, using a tool such as a *3M(TM) Scotch-Brite Roloc disc or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set > Page 323 4. Install the ground, then the washer and then the bolt to the frame. Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish. 5. Install a washer and nut to the back side of the frame. Tighten Tighten the nut to 9 Nm (79 lb in). 6. Cover the front and back side of the repair area using Rubberized Undercoating. An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 Electronic Brake Control Module: Customer Interest ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 TECHNICAL Bulletin No.: 08-05-25-005 Date: October 01, 2008 Subject: Intermittent StabiliTrak(R) Indicator Light Blinking, StabiliTrak(R) Active Message Displayed, DTC C0196 Set (Reprogram Electronic Brake Control Module (EBCM)) Models: 2006-2007 Buick Rainier 2006-2009 Chevrolet TrailBlazer Models 2006-2009 GMC Envoy Models 2006-2009 Saab 97X 2006-2009 Isuzu Ascender Models This bulletin provides information on two different conditions. Condition # 1 Some customers may comment on a Service StabiliTrak(R) indicator light along with a Service StabiliTrak(R) message displayed in the DIC. Upon investigation, the technician may find DTC C0196 set in history. Condition # 2 Some customers may comment on a blinking StabiliTrak(R) indicator light along with a StabiliTrak Active message displayed in the DIC during normal driving conditions. No DTCs will be found with this concern. Cause This condition may be caused by a software anomaly within the electronic brake control module (EBCM) that allowed the yaw offset to be falsely learned. Correction Important: From the controller list, select "VSES Vehicle Stability Enhancement System Control Module". If routine diagnosis using SI does not reveal any obvious cause, reprogram the EBCM using SPS with the latest software available on TIS2WEB. Refer to the Service Programming System (SPS) procedures in SI. As always, make sure your Tech 2(R) is updated with the latest software version. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 > Page 328 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 07-08-49-006 > May > 07 > Brakes - StabiliTrak(R) Light On/DTC C0244 Electronic Brake Control Module: Customer Interest Brakes - StabiliTrak(R) Light On/DTC C0244 Bulletin No.: 07-08-49-006 Date: May 07, 2007 TECHNICAL Subject: Intermittent StabiliTrak(R) Service/Indicator Light On, Service StabiliTrak(R) Message Displayed, EBCM DTC C0244 Set (Reprogram Engine Control Module (ECM)) Models: 2006 Chevrolet TrailBlazer SS with 6.0L Engine (VIN H - RPO LS2) Condition Some customers may comment on an intermittent StabiliTrak(R) light being illuminated or a Service StabiliTrak(R) message displayed. Upon investigation, the technician may find EBCM DTC C0244 set in history. This condition may be induced during wide open throttle acceleration from a stop or when accelerating onto an express way during low ambient temperatures. Cause This condition may be caused by the ECM sending out an invalid torque request signal. Correction A new calibration has been released to correct this condition. Reprogram the ECM using SPS. This new service calibration is available on TIS2WEB. Be sure to select the correct calibration part number with the description that states - to prevent C0244 at low ambient temperatures. Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set Electronic Brake Control Module: All Technical Service Bulletins Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set TECHNICAL Bulletin No.: 04-05-25-002E Date: March 11, 2009 Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) Models Supercede: This bulletin is being revised to add step 2 to the procedure and update the Parts and Warranty Information. Please discard Corporate Bulletin Number 04-05-25-002D (Section 05 - Brakes). Condition Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module. Cause A poor connection at the EBCM ground is causing unnecessary replacement of brake modules. Important: The EBCM ground is different for each application. Refer to the list below for the proper ground reference: ^ Midsize Utilities = Ground 304 ^ SSR = Ground 400 ^ Fullsize Trucks and Utilities = Ground 110 Correction Important: Do not replace the brake module to correct this condition. Perform the following repair before further diagnosis of the EBCM. Perform the following steps to improve the connection of the EBCM Ground: 1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire. 2. If the original fastener has a welded on nut, remove the nut from the frame, and if required, enlarge the bolt hole to accommodate the new bolt and nut. 3. Clean the area, front and back, using a tool such as a *3M(TM) Scotch-Brite Roloc disc or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set > Page 338 4. Install the ground, then the washer and then the bolt to the frame. Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish. 5. Install a washer and nut to the back side of the frame. Tighten Tighten the nut to 9 Nm (79 lb in). 6. Cover the front and back side of the repair area using Rubberized Undercoating. An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 Electronic Brake Control Module: All Technical Service Bulletins ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 TECHNICAL Bulletin No.: 08-05-25-005 Date: October 01, 2008 Subject: Intermittent StabiliTrak(R) Indicator Light Blinking, StabiliTrak(R) Active Message Displayed, DTC C0196 Set (Reprogram Electronic Brake Control Module (EBCM)) Models: 2006-2007 Buick Rainier 2006-2009 Chevrolet TrailBlazer Models 2006-2009 GMC Envoy Models 2006-2009 Saab 97X 2006-2009 Isuzu Ascender Models This bulletin provides information on two different conditions. Condition # 1 Some customers may comment on a Service StabiliTrak(R) indicator light along with a Service StabiliTrak(R) message displayed in the DIC. Upon investigation, the technician may find DTC C0196 set in history. Condition # 2 Some customers may comment on a blinking StabiliTrak(R) indicator light along with a StabiliTrak Active message displayed in the DIC during normal driving conditions. No DTCs will be found with this concern. Cause This condition may be caused by a software anomaly within the electronic brake control module (EBCM) that allowed the yaw offset to be falsely learned. Correction Important: From the controller list, select "VSES Vehicle Stability Enhancement System Control Module". If routine diagnosis using SI does not reveal any obvious cause, reprogram the EBCM using SPS with the latest software available on TIS2WEB. Refer to the Service Programming System (SPS) procedures in SI. As always, make sure your Tech 2(R) is updated with the latest software version. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 > Page 343 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 07-08-49-006 > May > 07 > Brakes - StabiliTrak(R) Light On/DTC C0244 Electronic Brake Control Module: All Technical Service Bulletins Brakes - StabiliTrak(R) Light On/DTC C0244 Bulletin No.: 07-08-49-006 Date: May 07, 2007 TECHNICAL Subject: Intermittent StabiliTrak(R) Service/Indicator Light On, Service StabiliTrak(R) Message Displayed, EBCM DTC C0244 Set (Reprogram Engine Control Module (ECM)) Models: 2006 Chevrolet TrailBlazer SS with 6.0L Engine (VIN H - RPO LS2) Condition Some customers may comment on an intermittent StabiliTrak(R) light being illuminated or a Service StabiliTrak(R) message displayed. Upon investigation, the technician may find EBCM DTC C0244 set in history. This condition may be induced during wide open throttle acceleration from a stop or when accelerating onto an express way during low ambient temperatures. Cause This condition may be caused by the ECM sending out an invalid torque request signal. Correction A new calibration has been released to correct this condition. Reprogram the ECM using SPS. This new service calibration is available on TIS2WEB. Be sure to select the correct calibration part number with the description that states - to prevent C0244 at low ambient temperatures. Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 348 Electronic Brake Control Module: Locations Antilock Brake System Component Views Electronic Brake Control Module 2 - Electronic Brake Control Module (EBCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 349 Electronic Brake Control Module: Diagrams Electronic Brake Control Module (EBCM) Electronic Brake Control Module (EBCM) Electronic Brake Control Module (EBCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 350 Electronic Brake Control Module (EBCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 351 Electronic Brake Control Module: Service and Repair Electronic Brake Control Module Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Auxiliary Water Pump Relay > Component Information > Diagrams > HVAC System - Manual Auxiliary Water Pump Relay 1 (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Auxiliary Water Pump Relay > Component Information > Diagrams > HVAC System - Manual > Page 357 Auxiliary Water Pump Relay 1 (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions Radiator Cooling Fan Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 362 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 363 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 364 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 365 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 366 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 367 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 368 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 369 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 370 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 371 Radiator Cooling Fan Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 372 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 373 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 374 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 375 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 376 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 377 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 378 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 379 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 380 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 381 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 382 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 383 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 384 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 385 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 386 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 387 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 388 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 389 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 390 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 391 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 392 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 393 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 394 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 395 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 396 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 397 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 398 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 399 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 400 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 401 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 402 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 403 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 404 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 405 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 406 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 407 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 408 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 409 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 410 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 411 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 412 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 413 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 414 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 415 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 416 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 417 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 418 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 419 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 420 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 421 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 422 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 423 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 424 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 425 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 426 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 427 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 428 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 429 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 430 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 431 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 432 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 433 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 434 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations Radiator Cooling Fan Motor Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 438 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 439 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 440 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions Radiator Cooling Fan Motor Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 443 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 444 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 445 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 446 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 447 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 448 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 449 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 450 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 451 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 452 Radiator Cooling Fan Motor Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 453 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 454 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 455 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 456 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 457 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 458 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 459 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 460 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 461 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 462 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 463 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 464 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 465 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 466 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 467 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 468 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 469 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 470 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 471 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 472 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 473 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 474 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 475 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 476 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 477 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 478 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 479 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 480 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 481 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 482 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 483 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 484 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 485 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 486 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 487 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 488 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 489 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 490 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 491 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 492 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 493 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 494 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 495 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 496 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 497 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 498 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 499 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 500 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 501 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 502 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 503 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 504 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 505 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 506 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 507 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 508 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 509 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 510 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 511 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 512 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 513 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 514 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 515 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Page 516 Radiator Cooling Fan Motor Relay: Service and Repair Cooling Fan Relay Replacement ^ Tools Required J 43244 Relay Puller Pliers Removal Procedure 1. Remove the underhood electrical center cover. 2. Using the J 43244, remove the cooling fan relay (3). Installation Procedure Notice: Installation of the proper relay is critical. If an enhanced relay - equipped with a diode - is installed into a position requiring a standard relay - equipped without a diode - excessive current will damage any components associated with the relay or its associated circuits. 1. Install the cooling fan relay (3). 2. Install the underhood electrical center cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Auxiliary Water Pump Relay > Component Information > Diagrams > HVAC System - Manual Auxiliary Water Pump Relay 1 (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Auxiliary Water Pump Relay > Component Information > Diagrams > HVAC System - Manual > Page 522 Auxiliary Water Pump Relay 1 (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations Blower Motor Relay: Locations Manual HVAC The blower motor relay is in the Blower Motor Resistor Assembly. Instrument Panel Carrier Automatic HVAC The automatic HVAC does not use a blower motor relay. The blower motor is controlled by the Blower Motor Control Module. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 526 Instrument Panel Carrier Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions Blower Motor Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 529 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 530 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 531 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 532 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 533 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 534 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 535 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 536 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 537 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 538 Blower Motor Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 539 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 540 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 541 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 542 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 543 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 544 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 545 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 546 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 547 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 548 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 549 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 550 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 551 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 552 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 553 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 554 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 555 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 556 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 557 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 558 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 559 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 560 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 561 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 562 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 563 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 564 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 565 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 566 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 567 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 568 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 569 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 570 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 571 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 572 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 573 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 574 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 575 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 576 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 577 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 578 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 579 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 580 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 581 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 582 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 583 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 584 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 585 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 586 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 587 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 588 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 589 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 590 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 591 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 592 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 593 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 594 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 595 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 596 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 597 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 598 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 599 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 600 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 601 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Diagrams > Page 602 Blower Motor Relay: Service and Repair BLOWER MOTOR RELAY REPLACEMENT REMOVAL PROCEDURE 1. Remove the cover of the under hood fuse block. 2. Remove the blower motor relay (1) from the under hood fuse block (2). INSTALLATION PROCEDURE 1. Install the blower motor relay (1) to the under hood fuse block. 2. Install the cover of the under hood fuse block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations Compressor Clutch Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 606 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 607 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 608 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 609 Compressor Clutch Relay: Service and Repair COMPRESSOR RELAY REPLACEMENT REMOVAL PROCEDURE 1. Remove the protective cover from the underhood fuse block. 2. Remove the compressor relay (1) from the underhood fuse block (2). INSTALLATION PROCEDURE 1. Install the compressor relay (1) to the underhood fuse block (2). 2. Install the protective hood to the underhood fuse block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Technical Service Bulletins > Customer Interest for Control Module HVAC: > 05-01-39-002A > Mar > 06 > A/C - Musty Odors On Start Up Control Module HVAC: Customer Interest A/C - Musty Odors On Start Up Bulletin No.: 05-01-39-002A Date: March 17, 2006 TECHNICAL Subject: Musty Odor from HVAC System (Reprogram HVAC Control Module to Enable Afterblow Function) Models: 2004-2006 Buick Rainier 2003-2006 Chevrolet TrailBlazer, TrailBlazer EXT 2003-2006 GMC Envoy, Envoy XL 2004-2005 GMC Envoy XUV 2003-2004 Oldsmobile Bravada with Automatic Temperature Control HVAC System (RPO CJ2) Supercede: This bulletin is being revised to add the 2006 model year and update the calibration release date. Please discard Corporate Bulletin Number 05-01-39-002 (Section 01 - HVAC). Condition Some customers may comment on a musty odor from the Heating, Ventilation and Air Conditioning (HVAC) system. This condition occurs most often on initial start up after the vehicle was driven on a hot humid day. Cause This condition may be caused by condensate build-up on the evaporator core, which does not evaporate by itself in high humidity conditions. Correction Important: The afterblow function should not be enabled until after the purpose and operation of it is explained to your customer and they approve of the change. Once the afterblow function is enabled there are no calibrations currently released to disable it. Technicians are to reprogram the HVAC Control Module with an updated software calibration that will enable the afterblow function. The new calibration will be released beginning with TIS satellite data update version 2.0, which was made available February 5, 2006. The blower motor will turn on approximately 10 minutes after the vehicle is shut off. The blower motor will run continuously for 10 minutes at a 30% duty cycle. The afterblow function will only activate if the air conditioning compressor was engaged during conditions of high ambient temperature. If the vehicle is started within 10 minutes of the last key off, the afterblow function from the previous key cycle will be cancelled. Technicians should not attempt to reprogram a vehicle with a Manual Temperature Control HVAC system (RPO CJ3). Technicians should perform this HVAC Control Module reprogram instead of installing the Electronic Evaporator Dryer Module Kit referred to in the Air Conditioning Odor bulletin, Corporate Bulletin Number 99-01-39-004A. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Technical Service Bulletins > Customer Interest for Control Module HVAC: > 05-01-39-002A > Mar > 06 > A/C - Musty Odors On Start Up > Page 618 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Control Module HVAC: > 05-01-39-002A > Mar > 06 > A/C - Musty Odors On Start Up Control Module HVAC: All Technical Service Bulletins A/C - Musty Odors On Start Up Bulletin No.: 05-01-39-002A Date: March 17, 2006 TECHNICAL Subject: Musty Odor from HVAC System (Reprogram HVAC Control Module to Enable Afterblow Function) Models: 2004-2006 Buick Rainier 2003-2006 Chevrolet TrailBlazer, TrailBlazer EXT 2003-2006 GMC Envoy, Envoy XL 2004-2005 GMC Envoy XUV 2003-2004 Oldsmobile Bravada with Automatic Temperature Control HVAC System (RPO CJ2) Supercede: This bulletin is being revised to add the 2006 model year and update the calibration release date. Please discard Corporate Bulletin Number 05-01-39-002 (Section 01 - HVAC). Condition Some customers may comment on a musty odor from the Heating, Ventilation and Air Conditioning (HVAC) system. This condition occurs most often on initial start up after the vehicle was driven on a hot humid day. Cause This condition may be caused by condensate build-up on the evaporator core, which does not evaporate by itself in high humidity conditions. Correction Important: The afterblow function should not be enabled until after the purpose and operation of it is explained to your customer and they approve of the change. Once the afterblow function is enabled there are no calibrations currently released to disable it. Technicians are to reprogram the HVAC Control Module with an updated software calibration that will enable the afterblow function. The new calibration will be released beginning with TIS satellite data update version 2.0, which was made available February 5, 2006. The blower motor will turn on approximately 10 minutes after the vehicle is shut off. The blower motor will run continuously for 10 minutes at a 30% duty cycle. The afterblow function will only activate if the air conditioning compressor was engaged during conditions of high ambient temperature. If the vehicle is started within 10 minutes of the last key off, the afterblow function from the previous key cycle will be cancelled. Technicians should not attempt to reprogram a vehicle with a Manual Temperature Control HVAC system (RPO CJ3). Technicians should perform this HVAC Control Module reprogram instead of installing the Electronic Evaporator Dryer Module Kit referred to in the Air Conditioning Odor bulletin, Corporate Bulletin Number 99-01-39-004A. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Control Module HVAC: > 05-01-39-002A > Mar > 06 > A/C - Musty Odors On Start Up > Page 624 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Technical Service Bulletins > Page 625 Instrument Panel Carrier Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions Control Module HVAC: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 628 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 629 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 630 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 631 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 632 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 633 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 634 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 635 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 636 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 637 Control Module HVAC: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 638 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 639 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 640 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 641 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 642 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 643 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 644 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 645 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 646 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 647 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 648 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 649 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 650 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 651 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 652 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 653 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 654 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 655 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 656 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 657 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 658 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 659 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 660 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 661 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 662 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 663 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 664 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 665 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 666 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 667 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 668 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 669 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 670 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 671 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 672 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 673 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 674 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 675 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 676 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 677 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 678 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 679 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 680 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 681 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 682 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 683 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 684 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 685 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 686 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 687 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 688 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 689 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 690 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 691 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 692 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 693 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 694 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 695 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 696 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 697 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 698 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 699 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 700 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 701 Control Module HVAC: Connector Views Blower Motor Control Module Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Diagrams > Diagram Information and Instructions > Page 702 Blower Motor Control Processor - Auxiliary (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Service and Repair > Blower Motor Control Processor Control Module HVAC: Service and Repair Blower Motor Control Processor BLOWER MOTOR CONTROL PROCESSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the right closeout panel. 2. Disconnect the electrical connector from the blower motor. 3. Disconnect the electrical connector (3) from the blower motor control processor (1). 4. Remove the blower motor control processor mounting screws (2). 5. Remove the blower motor control processor (1). INSTALLATION PROCEDURE 1. Install the blower motor control processor (1). 2. Install the blower motor control processor mounting screws (2). Tighten the screws to 1.9 N.m (17 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 3. Connect the electrical connector (3) to the blower motor control processor (1). 4. Connect the electrical connector to the blower motor. 5. Install the right closeout panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Service and Repair > Blower Motor Control Processor > Page 705 Control Module HVAC: Service and Repair Blower Motor Processor - Auxiliary BLOWER MOTOR PROCESSOR REPLACEMENT - AUXILIARY REMOVAL PROCEDURE 1. Remove the right rear quarter trim panel. 2. Remove the HVAC module-auxiliary. 3. Disconnect the electrical connector from the blower motor processor. 4. Remove the retaining screws from the blower motor processor (1). 5. Remove the blower motor processor (3) from the HVAC module (2). INSTALLATION PROCEDURE 1. Install the blower motor processor (3) to the HVAC module (2). 2. Install the retaining screws to the blower motor processor (3). Tighten the screws to 1.9 N.m (17 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 3. Install the HVAC module-auxiliary. 4. Connect the electrical connector to the blower motor processor (1). 5. Install the right rear quarter trim panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label Fog/Driving Lamp Relay: Locations Fuse Block - Rear (Short Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 711 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 712 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 713 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 714 Fog/Driving Lamp Relay: Locations Fuse Block - Rear (Long Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 715 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 716 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Fog/Driving Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 717 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Headlamp Relay > Component Information > Locations Headlamp Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Headlamp Relay > Component Information > Locations > Page 721 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Headlamp Relay > Component Information > Locations > Page 722 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Headlamp Relay > Component Information > Locations > Page 723 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations Horn Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 727 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 728 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations > Page 729 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label Parking Lamp Relay: Locations Fuse Block - Rear (Short Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 734 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 735 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 736 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 737 Parking Lamp Relay: Locations Fuse Block - Rear (Long Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 738 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 739 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Lighting and Horns > Parking Lamp Relay > Component Information > Locations > Fuse Block - Rear (Short Wheel Base), Label > Page 740 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood Relay Box: Application and ID Fuse Block - Underhood Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 746 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 747 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 748 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 749 Relay Box: Application and ID Fuse Block - Rear (Short Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 750 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 751 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 752 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 753 Relay Box: Application and ID Fuse Block - Rear (Long Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 754 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 755 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 756 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement Relay Box: Service and Repair Rear Electrical Center or Junction Block Replacement REAR ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. Refer to Seat Replacement - Rear No. 1 (TrailBlazer EXT, Envoy XL) in Seats. 3. If replacing the rear electrical center on a Chevrolet TrailBlazer or GMC Envoy, position the left second row seat to a cargo position. 4. Remove the rear electrical center cover. 5. Remove the battery feed terminal nut (2) from the junction block. 6. Remove the body control module (BCM) from the rear electrical center. Refer to Body Control Module Replacement in Computer/Integrating Systems. 7. Fully loosen the 3 bolts (1) that retain the junction block to the electrical connectors. 8. Release the tabs that retain the junction block to the block base. 9. Remove the junction block from the block base. 10. Disconnect the instrument panel harness connector (1) from the junction block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 759 11. Disconnect the mobile telephone harness connector (1) from the junction block. 12. Disconnect the body wiring harness connector (1) from the junction block. 13. Disconnect the headliner harness connector (2) from the junction block. 14. Disconnect the console harness connector from the junction block. 15. Remove the block base retaining nuts from the floor studs. 16. Remove the block base from the floor panel. INSTALLATION PROCEDURE 1. Install the block base to the floor studs. 2. Install the block base retaining nuts to the floor studs. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the block base retaining nuts to 10 N.m (88 lb in). 3. Connect the console harness connector to the block base. 4. Connect the headliner harness connector (2) to the block base. 5. Connect the body wiring harness connector (1) to the block base. 6. Connect the mobile telephone harness connector (1) to the junction block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 760 7. Connect the instrument panel harness connector (1) to the block base. 8. Install the junction block to the block base.Ensure that the retaining tabs are fully seated. 9. Install the 3 bolts (1) that retain the junction block to the block base. Tighten the 3 bolts to 3.5 N.m (31 lb in). 10. Install the BCM to the rear electrical center. Refer to Body Control Module Replacement in Computer/Integrating Systems. 11. Install the battery feed terminal nut (2) to the junction block. Tighten the battery feed terminal nut to 10 N.m (88 lb in). 12. Install the rear electrical center cover. 13. If replacing the rear electrical center on a Chevrolet TrailBlazer or GMC Envoy, position the left second row seat to a passenger position. 14. If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. Refer to Seat Replacement - Rear No. 1 (TrailBlazer EXT, Envoy XL) in Seats. 15. Connect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 761 Relay Box: Service and Repair Underhood Electrical Center or Junction Block Replacement UNDERHOOD ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. 2. Press tabs (1) inward and lift to remove the junction block cover. 3. Pull upward on the fuse relay center cover (1) to release the retaining tabs and remove the cover. 4. Note the location and remove the harness end bolts (2) and remove the harness ends from the fuse relay center. 5. Remove the fuse relay center bolts (3) and remove the fuse relay center from the junction block bracket. 6. Pull downward on the wiring harness ends to remove from the bottom of the fuse relay center. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 762 7. Remove the junction block bracket retaining bolts (1) and remove the junction block bracket from the vehicle. INSTALLATION PROCEDURE 1. Position the junction block bracket and install the bolts (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the junction block bracket bolts to 6 N.m (53 lb in). 2. Align the wiring harnesses and install the fuse relay center. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 763 3. Install the fuse relay center bolts (3). Tighten the relay center bolts to 6 N.m (53 lb in). 4. Install the harness end bolts (2). 5. Install the fuse relay center cover (1) over the relay center bolts. Press downward to engage the tabs. 6. Install the junction block cover. Press downward to engage the tabs. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Locations Body Control Module (BCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions Body Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 771 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 772 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 773 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 774 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 775 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 776 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 777 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 778 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 779 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 780 Body Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 781 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 782 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 783 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 784 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 785 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 786 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 787 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 788 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 789 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 790 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 791 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 792 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 793 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 794 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 795 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 796 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 797 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 798 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 799 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 800 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 801 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 802 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 803 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 804 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 805 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 806 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 807 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 808 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 809 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 810 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 811 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 812 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 813 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 814 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 815 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 816 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 817 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 818 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 819 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 820 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 821 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 822 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 823 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 824 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 825 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 826 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 827 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 828 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 829 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 830 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 831 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 832 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 833 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 834 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 835 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 836 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 837 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 838 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 839 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 840 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 841 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 842 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 843 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 844 Body Control Module: Connector Views Body Control Module (BCM) C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 845 Body Control Module (BCM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 846 Body Control Module (BCM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 847 Body Control Module (BCM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 848 Body Control Module (BCM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 849 Body Control Module: Electrical Diagrams Door Control Module Diagrams Door Control Module Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 850 Door Control Module Diagram 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 851 Door Control Module Diagram 3 Locations: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Body Control System Diagrams Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 852 Body Control System Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 853 Body Control System Diagram 2 (1 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 854 Body Control System Diagram 3 (2 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 855 Body Control System Diagram 4 (3 Of 3) Location: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System Body Control Module: Description and Operation Body Control System BODY CONTROL SYSTEM DESCRIPTION AND OPERATION BCM FUNCTIONS The body control module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be: Sensors and switches that are directly connected to the BCM - Class 2 serial data received from other control modules connected to the class 2 serial data link. The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message. The BCM controls these functions: Audible warnings-Refer to Audible Warnings Description and Operation in Instrument Panel, Gages and Console - Automatic door locks-Refer to Power Door Locks Description and Operation in Doors - Automatic headlamp control-Refer to Exterior Lighting Systems Description and Operation in Lighting Systems - Interior lighting-Refer to Interior Lighting Systems Description and Operation in Lighting Systems - Keyless entry (AUO option)-Refer to Keyless Entry System Description and Operation in Keyless Entry. - Passlock theft deterrent-Refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent. - Retained accessory power (RAP)-Refer to Retained Accessory Power (RAP) Description and Operation POWER MODE The BCM is the power mode master (PMM). Refer to Power Mode Description and Operation for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 858 Body Control Module: Description and Operation Power Mode POWER MODE DESCRIPTION AND OPERATION SERIAL DATA POWER MODE On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition 0, Ignition 1, and Accessory. To determine the correct power mode the BCM uses: The state of these signals - The sequence of switch closures received by the BCM - The status of the engine run flag Correct Ignition Switch Inputs The chart indicates the power modes detected and transmitted by the BCM. FAIL-SAFE OPERATION Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the body control module (BCM) fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode. SERIAL DATA MESSAGES The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid BCM message until they receive the engine status from the powertrain control module (PCM). If the BCM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is true, indicating that the engine is running, the modules fail-safe to Run. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is false, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. DISCRETE IGNITION SIGNALS Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid BCM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, B+, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 859 Body Control Module: Description and Operation Retained Accessory Power (RAP) RETAINED ACCESSORY POWER (RAP) DESCRIPTION AND OPERATION SERIAL DATA CONTROL OF RETAINED ACCESSORY POWER (RAP) The class 2 modules receive the power mode message from the body control module (BCM) over the serial data circuits, indicating when the retained accessory power (RAP) power mode is current. The BCM monitors the ignition switch position, battery condition and passenger compartment doors status to determine whether RAP should be initiated. The modules then support the operation of the systems under their control as required by their RAP power mode operation. RAP will end when one of the following conditions is met: The BCM receives an input indicating the opening of any compartment door. - The BCM internal timer for the RAP expires after approximately 10 minutes. - The BCM detects a decrease in battery capacity below a prescribed limit. The BCM then sends a serial data power mode message Off-Awake ending the RAP function. The class 2 RAP functions are: The power windows - The entertainment devices - The DIC BCM/RELAY CONTROL OF RETAINED ACCESSORY POWER (RAP) The BCM keeps the RAP relay energized during all power modes, except Off-Awake. The devices powered through the RAP relay or controlled directly by BCM are: The rear vent windows - The sunroof The devices controlled by the BCM through the RAP supply voltage circuit are: The power roof module (PRM) - The mid-gate glass Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview Body Control Module: Initial Inspection and Diagnostic Overview DIAGNOSTIC STARTING POINT Begin the system diagnosis with Diagnostic System Check - Vehicle. The Diagnostic System Check - Vehicle will provide the following information: - The identification of the control modules which are not communicating. - The identification of any stored diagnostic trouble codes (DTCs) and their status. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin vehicle diagnosis. These must be performed before system DTC or symptom diagnosis. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 862 Body Control Module: Symptom Related Diagnostic Procedures SYMPTOMS IMPORTANT: The following steps must be completed before using the symptom tables. 1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true: - There are no DTCs set. - The control modules can communicate via the serial data links. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures 2. Review the system operation in order to familiarize yourself with the system functions. Refer to: - Data Link Communications Description and Operation - Body Control System Description and Operation - Retained Accessory Power (RAP) Description and Operation Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the systems. - Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: - Scan Tool Does Not Power Up See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Scan Tool Does Not Power Up - Scan Tool Does Not Communicate with High Speed GMLAN Device See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Scan Tool Does Not Communicate with High Speed GMLAN Device - Power Mode Mismatch See: Starting and Charging/Testing and Inspection/Symptom Related Diagnostic Procedures/Power Mode Mismatch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement Body Control Module: Service and Repair Body Control Module Replacement BODY CONTROL MODULE REPLACEMENT REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. Do not open the BCM housing. The module does not have any serviceable components. The module may be replaced only as an assembly. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the 40-way body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 865 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, remove the BCM (1) from the rear electrical center. INSTALLATION PROCEDURE 1. Index the slots on the BCM (1) to the rear electrical center. 2. Using a downward motion, install the BCM to the rear electrical center. 3. Connect the 24-way gray electrical connector (1) to the BCM. 4. Connect the 32-way tan electrical connector (2) to the BCM. 5. Connect the 40-way body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 866 6. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 7. Install the rear electrical center cover. 8. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 9. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 10. Connect the negative battery cable. 11. If installing a replacement BCM, program the BCM. Refer to Control Module References. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 867 Body Control Module: Service and Repair Body Wiring Harness Extension Replacement - BCM BODY WIRING HARNESS EXTENSION REPLACEMENT - BCM REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 868 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, disconnect the body wiring extension (1) from the rear electrical center. 11. Remove the body wiring extension from the vehicle. INSTALLATION PROCEDURE 1. Using a downward motion, install the body wiring extension (1) to the rear electrical center. IMPORTANT: Ensure the sliding latch is fully extended before connecting the body wiring extension to the rear electrical center. 2. Connect the 24-way gray electrical connector (1) to the BCM. 3. Connect the 32-way tan electrical connector (2) to the BCM. 4. Connect the body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 869 5. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 6. Install the rear electrical center cover. 7. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 8. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 9. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage Engine Control Module: Technical Service Bulletins Engine Controls - Aftermarket Accessory Usage INFORMATION Bulletin No.: 04-06-04-054B Date: November 18, 2010 Subject: Info - Non-GM Parts and Accessories (Aftermarket) Models: 2011 and Prior GM Passenger Cars and Trucks Supercede: This bulletin is being revised to add model years and update to the new U.S. Fixed Operation Manager (FOM) and Canada Warranty Manager (WM) names. Please discard Corporate Bulletin Number 04-06-04-054A (Section 06 - Engine/Propulsion System). The recent rise and expansion of companies selling non-GM parts and accessories has made it necessary to issue this reminder to dealers regarding GM's policy on the use and installation of these aftermarket components. When a dealer is performing a repair under the New Vehicle Limited Warranty, they are required to use only genuine GM or GM-approved parts and accessories. This applies to all warranty repairs, special policy repairs or any repairs paid for by GM. Parts and accessories advertised as being "the same" as parts manufactured by GM, but not sold through GM, do not qualify for use in warranty repairs, special policy repairs or any repairs paid for by GM. During a warranty repair, if a GM original equipment part is not available through GM Customer Care and Aftersales (GM CC&A;), ACDelco(R) distributors, other GM dealers or approved sources, the dealer is to obtain comparable, non-GM parts and clearly indicate, in detail, on the repair order the circumstances surrounding why non-GM parts were used. The dealer must give customers written notice, prior to the sale or service, that such parts or accessories are not marketed or warranted by General Motors. It should also be noted that dealers modifying new vehicles and installing equipment, parts and accessories obtained from sources not authorized by GM are responsible for complying with the National Traffic and Motor Vehicle Safety Act. Certain non-approved parts or assemblies, installed by the dealer or its agent not authorized by GM, may result in a change to the vehicle's design characteristics and may affect the vehicle's ability to conform to federal law. Dealers must fully understand that non-GM approved parts may not have been validated, tested or certified for use. This puts the dealer at risk for potential liability in the event of a part or vehicle failure. If a GM part failure occurs as the result of the installation or use of a non-GM approved part, the warranty will not be honored. A good example of non-authorized modification of vehicles is the result of an ever increasing supply of aftermarket devices available to the customer, which claim to increase the horsepower and torque of the Duramax(TM) Diesel Engines. These include the addition of, but are not limited to one or more of the following modifications: - Propane injection - Nitrous oxide injection - Additional modules (black boxes) that connect to the vehicle wiring systems - Revised engine calibrations downloaded for the engine control module - Calibration modules which connect to the vehicle diagnostic connector - Modification to the engine turbocharger waste gate Although the installation of these devices, or modification of vehicle components, can increase engine horsepower and torque, they may also negatively affect the engine emissions, reliability and/or durability. In addition, other powertrain components, such as transmissions, universal joints, drive shafts, and front/rear axle components, can be stressed beyond design safety limits by the installation of these devices. General Motors does not support or endorse the use of devices or modifications that, when installed, increase the engine horsepower and torque. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Refer to the latest version of Bulletin 09-06-04-026 (V8 Gas Engines) or 06-06-01-007 (Duramax(TM) Diesel Engines) for more information on dealer requirements for calibration verification. These same policies apply as they relate to the use of non-GM accessories. Damage or failure from the use or installation of a non-GM accessory will not be covered under warranty. Failure resulting from the alteration or modification of the vehicle, including the cutting, welding or disconnecting of the vehicle's original equipment parts and components will void the warranty. Additionally, dealers will NOT be reimbursed or compensated by GM in the event of any legal inquiry at either the local, state or federal level that Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 874 results from the alteration or modification of a vehicle using non-GM approved parts or accessories. Dealers should be especially cautious of accessory companies that claim the installation of their product will not void the factory warranty. Many times these companies have even given direction on how to quickly disassemble the accessory in an attempt to preclude the manufacturer from finding out that is has been installed. Any suspect repairs should be reviewed by the Fixed Operations Manager (FOM), and in Canada by the Warranty Manager (WM) for appropriate repair direction. If it is decided that a goodwill repair is to be made on the vehicle, even with the installation of such non-GM approved components, the customer is to be made aware of General Motors position on this issue and is to sign the appropriate goodwill documentation required by General Motors. It is imperative for dealers to understand that by installing such devices, they are jeopardizing not only the warranty coverage, but also the performance and reliability of the customer's vehicle. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 875 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026C Date: August 13, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2011 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to the latest version of Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine , transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 876 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. Note All pictures must be sent as a.jpg file. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 877 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 878 Note All pictures must be sent as a.jpg file. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 879 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026B Date: April 07, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2010 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2010 model year and information about retrieving calibrations on a Global A vehicle. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 880 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 881 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 882 Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 883 Engine Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Page 884 Engine Control Module (ECM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions Engine Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 887 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 888 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 889 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 890 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 891 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 892 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 893 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 894 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 895 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 896 Engine Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 897 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 898 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 899 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 900 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 901 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 902 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 903 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 904 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 905 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 906 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 907 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 908 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 909 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 910 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 911 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 912 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 913 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 914 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 915 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 916 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 917 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 918 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 919 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 920 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 921 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 922 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 923 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 924 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 925 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 926 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 927 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 928 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 929 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 930 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 931 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 932 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 933 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 934 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 935 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 936 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 937 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 938 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 939 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 940 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 941 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 942 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 943 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 944 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 945 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 946 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 947 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 948 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 949 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 950 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 951 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 952 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 953 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 954 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 955 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 956 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 957 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 958 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 959 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 960 Engine Control Module: Connector Views Engine Control Module (ECM) C1 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 961 Engine Control Module (ECM) C1 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 962 Engine Control Module (ECM) C1 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 963 Engine Control Module (ECM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 964 Engine Control Module (ECM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 965 Engine Control Module (ECM) C2 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 966 Engine Control Module (ECM) C2 (Part 4) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 967 Engine Control Module (ECM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 968 Engine Control Module (ECM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) Engine Control Module: Description and Operation Engine Control Module (ECM) ENGINE CONTROL MODULE (ECM) DESCRIPTION The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The engine control module (ECM) is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the ECM detects a malfunction, the ECM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM. Malfunction Indicator Lamp (MIL) Operation The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON: The MIL indicates that an emissions related fault has occurred and vehicle service is required. The following is a list of the modes of operation for the MIL: The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate. - The MIL turns OFF after the engine is started if a diagnostic fault is not present. - The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate. - The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter. - When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON. - When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 971 Engine Control Module: Description and Operation Throttle Actuator Control (TAC) System ENGINE CONTROL MODULE The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 972 Engine Control Module: Description and Operation Electronic Ignition (EI) System ENGINE CONTROL MODULE (ECM) The engine control module (ECM) controls all ignition system functions, and constantly corrects the basic spark timing. The ECM monitors information from various sensor inputs that include the following: - The throttle position (TP) sensor - The engine coolant temperature (ECT) sensor - The mass air flow (MAF) sensor - The intake air temperature (IAT) sensor - The vehicle speed sensor (VSS) - The transmission gear position or range information sensors - The engine knock sensors (KS) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 973 Engine Control Module: Service and Repair ENGINE CONTROL MODULE (ECM) REPLACEMENT Service of the engine control module (ECM) should consist of either replacement of the ECM or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM. The replacement ECM must be programmed. NOTE: - Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage. - Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery. - In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board. - Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module. - The replacement control module must be programmed. IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change. Removal Procedure 1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life. 2. Disconnect the negative battery cable. 3. Disconnect the cooling fan electrical connector for additional clearance while removing the ECM. 4. Depress the ECM/transmission control module (TCM) cover retainers (2). 5. Remove the ECM/TCM cover from the ECM/TCM bracket (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 974 6. Disconnect the ECM electrical connectors (2) from the ECM (1). NOTE: Refer to Handling ESD Sensitive Parts Notice in Service Precautions. IMPORTANT: It is not necessary to disconnect the ECM electrical connectors in order to remove the ECM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. - Remove any debris from around the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM. 7. Release the bracket ECM retainers (1). 8. Tilt the ECM (2) away from the ECM/TCM bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 975 9. Remove the ECM (2) from the ECM bracket (1). 10. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the TCM (1). 11. Remove the ECM/TCM bracket retaining bolts (2). 12. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 976 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolts to 10 N.m (89 lb in). 4. If the TCM was previously removed from the ECM/TCM bracket (2), install the TCM (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 977 5. Insert the ECM (2) into the retaining slots of the ECM/TCM bracket (1). 6. Secure the ECM (2) to the ECM/TCM mounting bracket ensuring the ECM retaining tabs (1) are fully engaged. 7. Connect the ECM electrical connectors (2) to the ECM (1) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 978 12. If the ECM was replaced the replacement ECM must be programmed. See: Testing and Inspection/Programming and Relearning Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 982 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse - If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations Fuel Pump Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 987 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 988 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 989 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions Fuel Pump Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 992 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 993 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 994 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 995 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 996 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 997 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 998 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 999 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1000 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1001 Fuel Pump Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1002 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1003 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1004 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1005 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1006 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1007 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1008 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1009 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1010 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1011 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1012 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1013 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1014 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1015 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1016 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1017 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1018 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1019 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1020 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1021 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1022 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1023 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1024 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1025 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1026 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1027 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1028 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1029 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1030 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1031 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1032 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1033 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1034 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1035 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1036 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1037 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1038 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1039 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1040 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1041 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1042 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1043 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1044 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1045 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1046 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1047 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1048 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1049 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1050 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1051 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1052 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1053 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1054 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1055 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1056 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1057 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1058 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1059 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1060 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1061 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1062 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1063 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 1064 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 1068 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse - If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > Customer Interest: > 08-09-41-002F > Jun > 10 > Restraints - Air Bag Lamp ON/Multiple DTC Set Air Bag Control Module: Customer Interest Restraints - Air Bag Lamp ON/Multiple DTC Set TECHNICAL Bulletin No.: 08-09-41-002F Date: June 10, 2010 Subject: Diagnostic Information for Supplemental Inflatable Restraint (SIR) System, Intermittent AIR BAG Indicator/Lamp Illuminated with DTC(s) B0012, B0013, B0015, B0016, B0019, B0020, B0022, B0023, B0026, B0033, B0040, B0042 or B0044 Set (Inspect and Replace Connector Position Assurance (CPA) Retainer) Models: 2005-2007 Buick Rainier 2006-2009 Buick Allure (Canada only), LaCrosse, Lucerne 2008-2010 Buick Enclave 2006-2010 Cadillac DTS 2007-2010 Cadillac Escalade Models 2008-2009 Cadillac SRX, XLR 2008-2010 Cadillac CTS, STS 2005-2006 Chevrolet SSR 2005-2009 Chevrolet TrailBlazer, TrailBlazer EXT 2005-2010 Chevrolet Cobalt 2006-2007 Chevrolet Monte Carlo 2006-2010 Chevrolet Corvette, HHR, Impala, Malibu Models (includes Malibu Classic) 2007-2009 Chevrolet Equinox 2007-2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2008-2010 Chevrolet Express 2009-2010 Chevrolet Traverse 2005-2009 GMC Envoy Models 2007-2010 GMC Acadia, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL 2008-2010 GMC Savana 2005-2006 Pontiac Pursuit 2005-2009 Pontiac G6 2006-2009 Pontiac Solstice 2007-2009 Pontiac G5, Torrent 2008-2009 Pontiac G8 2005-2009 Saab 9-7X 2007-2009 Saturn AURA, OUTLOOK, SKY 2008-2009 Saturn VUE 2008-2009 HUMMER H2 2007-2008 Daewoo G2X 2007-2009 Opel GT Supercede: This bulletin is being revised to update the Warranty Information and add Saab Warranty Information. Please discard Corporate Bulletin Number 08-09-41-002E (Section 09 Restraints). Condition - Some customers may comment on an intermittent or current AIR BAG indicator or lamp being illuminated on the instrument panel cluster (IPC). Important This bulletin only applies to the following DTCs: - Technicians may observe DTC(s) B0012 04, 0D, 0E; B0013 04, 0D, 0E; B0015 04, 0D, 0E; B0016 04, 0D, 0E; B0019 04, 0D, 0E; B0020 04, 0D, 0E; B0022, B0023 04, 0D, 0E; B0033 04, 0D, 0E; B0040 04, 0D, 0E; B0042 or B0044 set as Current or in History in the sensing and diagnostic module (SDM). Cause This condition may be caused by a loose, missing, or damaged connector position assurance (CPA) retainer at a supplemental inflatable restraint (SIR) module electrical connector, or a deployment loop wiring harness electrical connector. Correction Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > Customer Interest: > 08-09-41-002F > Jun > 10 > Restraints - Air Bag Lamp ON/Multiple DTC Set > Page 1078 Caution When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Failure to observe the correct procedure could cause deployment of the SIR components. Serious injury can occur. Failure to observe the correct procedure could also result in unnecessary SIR system repairs. 1. Perform the Diagnostic System Check-Vehicle. 2. Identify the DTC that is set AND review the DTC Descriptor in the corresponding diagnostic procedure. Refer to Diagnostic Trouble Code (DTC) List-Vehicle in SI. 3. Using the information from the DTC Descriptor, determine the location of the affected electrical connector. Refer to SIR Identification Views and the Master Electrical Component List in SI. 4. Turn OFF the ignition and disable the supplemental inflatable restraint (SIR) system. Refer to SIR Disabling and Enabling in SI. 5. BEFORE removing, INSPECT the CPA retainer at the electrical connector. Note The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. ‹› If the CPA retainer is loose, damaged, or will not seat in the connector, replace it with a new one. Reinstall the CPA correctly by first pushing the connector body in completely, and then pushing the CPA retainer in completely. ‹› If the CPA retainer is not loose or damaged and is properly seated, proceed to Step 6. 6. Remove the CPA retainer and disconnect the electrical connector. Inspect the terminals for the following conditions: - Corrosion - Contamination - Terminal tension - Damage Important The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. DO NOT substitute any other terminals for those in the repair kit. ‹› If the terminals are damaged, corrosion is observed, or have poor tension, repair or replace as necessary. Apply dielectric grease, GM P/N 12345579 (in Canada, use P/N 10953481) on the connector pins and terminals when reassembling. Refer to SIR/SRS Wiring Repairs in SI. Note The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. 7. Connect the electrical connector, and install the CPA retainer. 8. Enable the supplemental inflatable restraint (SIR) system. Refer to SIR Disabling and Enabling in SI. 9. Clear the DTC with a scan tool. 10. Verify that the DTC does not reset by performing the Diagnostic Repair Verification in SI. ‹› If any DTC resets, then refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. Parts Information Note If the CPA retainer P/N 54590003 (Orange CPA) cannot be located in the J-38125 SIR/SRS terminal repair kit, contact Kent Moore Tools and order P/N 54590003-PKG to obtain a package of 5. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > Customer Interest: > 08-09-41-002F > Jun > 10 > Restraints - Air Bag Lamp ON/Multiple DTC Set > Page 1079 Warranty Information (excluding Saab U.S. Models) Important Select the appropriate Labor Operation for the repair that is performed. For vehicles repaired under warranty, use: Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 08-09-41-002F > Jun > 10 > Restraints - Air Bag Lamp ON/Multiple DTC Set Air Bag Control Module: All Technical Service Bulletins Restraints - Air Bag Lamp ON/Multiple DTC Set TECHNICAL Bulletin No.: 08-09-41-002F Date: June 10, 2010 Subject: Diagnostic Information for Supplemental Inflatable Restraint (SIR) System, Intermittent AIR BAG Indicator/Lamp Illuminated with DTC(s) B0012, B0013, B0015, B0016, B0019, B0020, B0022, B0023, B0026, B0033, B0040, B0042 or B0044 Set (Inspect and Replace Connector Position Assurance (CPA) Retainer) Models: 2005-2007 Buick Rainier 2006-2009 Buick Allure (Canada only), LaCrosse, Lucerne 2008-2010 Buick Enclave 2006-2010 Cadillac DTS 2007-2010 Cadillac Escalade Models 2008-2009 Cadillac SRX, XLR 2008-2010 Cadillac CTS, STS 2005-2006 Chevrolet SSR 2005-2009 Chevrolet TrailBlazer, TrailBlazer EXT 2005-2010 Chevrolet Cobalt 2006-2007 Chevrolet Monte Carlo 2006-2010 Chevrolet Corvette, HHR, Impala, Malibu Models (includes Malibu Classic) 2007-2009 Chevrolet Equinox 2007-2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2008-2010 Chevrolet Express 2009-2010 Chevrolet Traverse 2005-2009 GMC Envoy Models 2007-2010 GMC Acadia, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL 2008-2010 GMC Savana 2005-2006 Pontiac Pursuit 2005-2009 Pontiac G6 2006-2009 Pontiac Solstice 2007-2009 Pontiac G5, Torrent 2008-2009 Pontiac G8 2005-2009 Saab 9-7X 2007-2009 Saturn AURA, OUTLOOK, SKY 2008-2009 Saturn VUE 2008-2009 HUMMER H2 2007-2008 Daewoo G2X 2007-2009 Opel GT Supercede: This bulletin is being revised to update the Warranty Information and add Saab Warranty Information. Please discard Corporate Bulletin Number 08-09-41-002E (Section 09 Restraints). Condition - Some customers may comment on an intermittent or current AIR BAG indicator or lamp being illuminated on the instrument panel cluster (IPC). Important This bulletin only applies to the following DTCs: - Technicians may observe DTC(s) B0012 04, 0D, 0E; B0013 04, 0D, 0E; B0015 04, 0D, 0E; B0016 04, 0D, 0E; B0019 04, 0D, 0E; B0020 04, 0D, 0E; B0022, B0023 04, 0D, 0E; B0033 04, 0D, 0E; B0040 04, 0D, 0E; B0042 or B0044 set as Current or in History in the sensing and diagnostic module (SDM). Cause This condition may be caused by a loose, missing, or damaged connector position assurance (CPA) retainer at a supplemental inflatable restraint (SIR) module electrical connector, or a deployment loop wiring harness electrical connector. Correction Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 08-09-41-002F > Jun > 10 > Restraints - Air Bag Lamp ON/Multiple DTC Set > Page 1085 Caution When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Failure to observe the correct procedure could cause deployment of the SIR components. Serious injury can occur. Failure to observe the correct procedure could also result in unnecessary SIR system repairs. 1. Perform the Diagnostic System Check-Vehicle. 2. Identify the DTC that is set AND review the DTC Descriptor in the corresponding diagnostic procedure. Refer to Diagnostic Trouble Code (DTC) List-Vehicle in SI. 3. Using the information from the DTC Descriptor, determine the location of the affected electrical connector. Refer to SIR Identification Views and the Master Electrical Component List in SI. 4. Turn OFF the ignition and disable the supplemental inflatable restraint (SIR) system. Refer to SIR Disabling and Enabling in SI. 5. BEFORE removing, INSPECT the CPA retainer at the electrical connector. Note The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. ‹› If the CPA retainer is loose, damaged, or will not seat in the connector, replace it with a new one. Reinstall the CPA correctly by first pushing the connector body in completely, and then pushing the CPA retainer in completely. ‹› If the CPA retainer is not loose or damaged and is properly seated, proceed to Step 6. 6. Remove the CPA retainer and disconnect the electrical connector. Inspect the terminals for the following conditions: - Corrosion - Contamination - Terminal tension - Damage Important The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. DO NOT substitute any other terminals for those in the repair kit. ‹› If the terminals are damaged, corrosion is observed, or have poor tension, repair or replace as necessary. Apply dielectric grease, GM P/N 12345579 (in Canada, use P/N 10953481) on the connector pins and terminals when reassembling. Refer to SIR/SRS Wiring Repairs in SI. Note The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. 7. Connect the electrical connector, and install the CPA retainer. 8. Enable the supplemental inflatable restraint (SIR) system. Refer to SIR Disabling and Enabling in SI. 9. Clear the DTC with a scan tool. 10. Verify that the DTC does not reset by performing the Diagnostic Repair Verification in SI. ‹› If any DTC resets, then refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. Parts Information Note If the CPA retainer P/N 54590003 (Orange CPA) cannot be located in the J-38125 SIR/SRS terminal repair kit, contact Kent Moore Tools and order P/N 54590003-PKG to obtain a package of 5. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 08-09-41-002F > Jun > 10 > Restraints - Air Bag Lamp ON/Multiple DTC Set > Page 1086 Warranty Information (excluding Saab U.S. Models) Important Select the appropriate Labor Operation for the repair that is performed. For vehicles repaired under warranty, use: Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 06-09-41-003A > Aug > 06 > Air Bag System - SIR Lamp ON/Multiple DTC's Set Air Bag Control Module: All Technical Service Bulletins Air Bag System - SIR Lamp ON/Multiple DTC's Set Bulletin No.: 06-09-41-003A Date: August 22, 2006 TECHNICAL Subject: EI06058 - SIR Light On, DTCs B0022, B0024, B0026, B0042, B0043, B0044 (Diagnose and Repair According to SI) Models: 2005-2006 Buick Rainier 2005-2006 Chevrolet TrailBlazer, TrailBlazer EXT 2005 GMC Envoy XUV 2005-2006 GMC Envoy, Envoy XL 2005-2006 Saab 9-7X Supercede: This bulletin is being revised due to additional information no longer needed by Engineering. Please discard Corporate Bulletin Number 06-09-41-003 (Section 09 - Restraints). Condition Some customers may comment that the SIR light is on and any of the following DTCs set: B0022 B0026 B0042 B0043 B0044 Correction Engineering has confirmed that all repairs for the concerns listed in this bulletin should be diagnosed and repaired according to information found in SI. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1096 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1097 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1098 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1099 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1105 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1106 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1107 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Bag Control Module: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1108 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Technical Service Bulletins > Page 1109 Inflatable Restraint Sensing And Diagnostic Module (SDM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions Air Bag Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1112 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1113 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1114 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1115 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1116 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1117 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1118 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1119 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1120 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1121 Air Bag Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1122 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1123 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1124 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1125 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1126 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1127 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1128 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1129 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1130 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1131 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1132 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1133 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1134 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1135 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1136 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1137 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1138 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1139 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1140 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1141 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1142 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1143 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1144 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1145 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1146 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1147 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1148 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1149 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1150 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1151 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1152 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1153 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1154 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1155 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1156 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1157 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1158 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1159 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1160 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1161 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1162 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1163 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1164 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1165 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1166 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1167 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1168 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1169 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1170 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1171 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1172 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1173 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1174 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1175 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1176 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1177 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1178 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1179 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1180 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1181 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1182 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1183 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1184 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1185 Air Bag Control Module: Connector Views Inflatable Restraint Sensing And Diagnostic Module (SDM) (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 1186 Inflatable Restraint Sensing And Diagnostic Module (SDM) (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Page 1187 Air Bag Control Module: Description and Operation INFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE (SDM) The sensing and diagnostic module (SDM) is a microprocessor and the control center for the Supplemental Inflatable Restraint (SIR) System. The SDM contains internal sensors along with several external sensors, if equipped, mounted at various locations on the vehicle. In the event of a collision, the SDM performs calculations using the signals received from the internal and external sensors. The SDM compares the results of the calculations to values stored in memory. When these calculations exceed the stored value, the SDM will cause current to flow through the appropriate deployment loops to deploy the air bags. The SDM records the SIR System status when a deployment occurs and requests the instrument panel cluster (IPC) to turn the AIR BAG indicator ON. The SDM performs continuous diagnostic monitoring of the SIR System electrical components and circuitry when the ignition is turned ON. If the SDM detects a malfunction, a DTC will be stored and the SDM will request the IPC to turn the AIR BAG indicator ON. In the event that ignition 1 voltage is lost during a collision, the SDM maintains a 23-volt loop reserve (23 VLR) for deployment of the air bags. It is important to note, when disabling the SIR System for servicing or rescue operations to allow the 23 VLR to dissipate, which could take up to 1 minute. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Page 1188 Air Bag Control Module: Service and Repair INFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE REPLACEMENT REMOVAL PROCEDURE 1. Disable the supplemental inflatable restraint (SIR) system. Refer to SIR Disabling and Enabling. CAUTION: Do not strike or jolt the inflatable restraint sensing and diagnostic module (SDM). Before applying power to the SDM, make sure that it is securely fastened with the arrow facing toward the front of the vehicle. Failure to observe the correct installation procedure could cause SIR deployment, personal injury, or unnecessary SIR system repairs. - Refer to SIR Caution. 2. Remove the floor console. 3. Partially remove the console mounting bracket in order to allow access to the rear carpet. Refer to Bracket Replacement - Console Floor. 4. Position the rear carpet in order to access the sensing and diagnostic module (SDM). 5. Disconnect the electrical connectors (2) from the SDM (1). 6. Remove the nuts that retain the SDM to the floor panel. 7. Remove the SDM from the vehicle. INSTALLATION PROCEDURE 1. Remove any dirt, grease, etc. from the mounting surface. 2. Install the SDM horizontally to the vehicle. 3. Point the arrow on the SDM towards the front of the vehicle. 4. Install the nuts that retain the SDM to the floor panel. Tighten the nuts to 12 N.m (106 lb in). NOTE: Refer to Fastener Notice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Diagrams > Page 1189 5. Connect the electrical connectors (2) to the SDM (1). 6. Return the carpet to the fully installed position. 7. Install the console mounting bracket to the floor panel. 8. Install the floor console. 9. Enable the SIR system. Refer to SIR Disabling and Enabling. IMPORTANT: The AIR BAG indicator may remain ON after the SDM has been replaced. DTC B1001 may set requiring the SDM part number to be set in multiple modules. If the indicator remains ON after enabling the SIR system, perform the diagnostic system check and follow the steps thoroughly to ensure that the SDM is set up properly. 10. Refer to Control Module References for programming and setup information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Starting and Charging > Starter Relay > Component Information > Locations Starter Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Starting and Charging > Starter Relay > Component Information > Locations > Page 1194 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Starting and Charging > Starter Relay > Component Information > Locations > Page 1195 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Starting and Charging > Starter Relay > Component Information > Locations > Page 1196 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Steering and Suspension > Relays and Modules - Suspension > Suspension Control Module > Component Information > Technical Service Bulletins > Customer Interest for Suspension Control Module: > 06-03-09-006B > Dec > 08 > Suspension - Rear Suspension Is Low/Sagging/Uneven Suspension Control Module: Customer Interest Suspension - Rear Suspension Is Low/Sagging/Uneven ENGINEERING INFORMATION Bulletin No.: 06-03-09-006B Date: December 15, 2008 Subject: EI06006 - Rear Suspension Uneven, Sagging, Low (Recalibrate Air Spring Sensor) Models: 2006-2007 Buick Rainier 2006-2007 Chevrolet TrailBlazer SS 2006-2007 GMC Envoy, Envoy XL 2006-2007 Saab 9-7X with Suspension Pkg - Rear Load Leveling (RPO G67) Supercede: This bulletin is being revised to update the labor operation in the warranty information. Please discard Corporate Bulletin Number 06-03-09-006A (Section 03 - Suspension). Condition Some customers may comment on the rear suspension being uneven or sagging. Correction DO NOT REPLACE THE COMPRESSOR. Based on technician feedback, engineering has determined that the customer's concern can be corrected by recalibrating the air spring sensor. Refer to the Trim Height Uneven or Low diagnostics and Air Spring Sensor Calibration procedure found in SI. Warranty Information (excluding Saab U.S. Models) Warranty Information (Saab U.S. Models) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Steering and Suspension > Relays and Modules - Suspension > Suspension Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Suspension Control Module: > 06-03-09-006B > Dec > 08 > Suspension - Rear Suspension Is Low/Sagging/Uneven Suspension Control Module: All Technical Service Bulletins Suspension - Rear Suspension Is Low/Sagging/Uneven ENGINEERING INFORMATION Bulletin No.: 06-03-09-006B Date: December 15, 2008 Subject: EI06006 - Rear Suspension Uneven, Sagging, Low (Recalibrate Air Spring Sensor) Models: 2006-2007 Buick Rainier 2006-2007 Chevrolet TrailBlazer SS 2006-2007 GMC Envoy, Envoy XL 2006-2007 Saab 9-7X with Suspension Pkg - Rear Load Leveling (RPO G67) Supercede: This bulletin is being revised to update the labor operation in the warranty information. Please discard Corporate Bulletin Number 06-03-09-006A (Section 03 - Suspension). Condition Some customers may comment on the rear suspension being uneven or sagging. Correction DO NOT REPLACE THE COMPRESSOR. Based on technician feedback, engineering has determined that the customer's concern can be corrected by recalibrating the air spring sensor. Refer to the Trim Height Uneven or Low diagnostics and Air Spring Sensor Calibration procedure found in SI. Warranty Information (excluding Saab U.S. Models) Warranty Information (Saab U.S. Models) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Steering and Suspension > Relays and Modules - Wheels and Tires > Tire Pressure Module > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs Tire Pressure Module: Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Steering and Suspension > Relays and Modules - Wheels and Tires > Tire Pressure Monitor Receiver / Transponder > Component Information > Technical Service Bulletins > Tire Monitor System - TPM Sensor Information Tire Pressure Monitor Receiver / Transponder: Technical Service Bulletins Tire Monitor System TPM Sensor Information INFORMATION Bulletin No.: 08-03-16-003 Date: May 12, 2008 Subject: Warranty Reduction - Transfer of Tire Pressure Monitoring (TPM) Sensors to Replacement Wheels and Allowable TPM Sensor Replacements Models: 2000-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7x with On-Wheel TPM Sensors TPM Sensor / Wheel Warranty Reviews During the last warranty review period it was noted that wheels being returned under the GM New Vehicle Warranty were being shipped back to General Motors with the TPM sensor still attached to the wheel. Return rates ran as high as 60% with the TPM sensors still attached. Operational TPM sensors should not be returned to GM and are to be transferred to replacement wheels if they become necessary. Important: Operational TPM Sensors that are returned under warranty to General Motors will be charged back to the dealer.Sensors have a 10 year /150,000 mile (240,000 km) battery life, and should be transferred if one or more wheels are replaced. TPM Valve Stem / Grommet (0-ring) Replacement When the TPM sensors are transferred to new wheels you should replace the component used to seal the TPM sensor stem to the wheel. On sensors with an aluminum stem and visible nut on the outside of the wheel a replacement grommet (0-ring) should be used to assure a proper seal. The sensor retaining nut (except Aveo) should be tightened to 7 N.m (62 lb in) for all vehicles except Pontiac Vibe (4.0 N.m (35.4 lb in)). Important: ^ DO NOT overtorque the retaining nut. Notice: ^ Factory installed TPM Sensors come with plastic aluminum or nickel-plated brass stem caps. These caps should not be changed. Chrome plated steel caps may cause corrosion of aluminum valve stems due to incompatibility of the metals. On current style sensors the entire rubber stem is replaceable. The service interval on the revised TPM sensor with replaceable stem is the same as for any other traditional valve stem. Replace the stem at the time of tire replacement sensor transfer or whenever air seepage is suspected at the valve stem. When replacing the valve stem tighten the screw to 1.3 N.m (11.5 lb in). For either style of TPM sensor see the service parts guide for the correct GM part numbers to order and use. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Engine, A/T Controls Shared Diagnostic Trouble Codes Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1227 Control Module: Locations Automatic Transmission Electronic Component Views Transmission Control Module (TCM) 1 - Engine Harness 2 - Transmission Control Module (TCM) 3 - Transmission Control Module (TCM) Connector Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1228 Control Module: Diagrams Automatic Transmission Related Connector End Views Transmission Control Module (TCM), Engine Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1229 Transmission Control Module (TCM), Engine Side (5.3L and 6.0L) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1230 Control Module: Service and Repair Transmission Control Module (TCM) Replacement Service of the transmission control module (TCM) should consist of reprogramming of the TCM. If the diagnostic procedures call for the TCM to be replaced, the replacement TCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty TCM and install the new service TCM. The replacement TCM must be programmed. Removal Procedure 1. Disconnect the negative battery cable. 2. Disconnect the cooling fan electrical connector for additional clearance while removing the TCM. 3. Depress the engine control module (ECM)/TCM cover retainers (2). 4. Remove the ECM/TCM cover from the ECM/TCM bracket (1). 5. Disconnect the TCM electrical connector (1) from the TCM (2) Notice: Refer to Handling ESD Sensitive Parts Notice. Important: It is not necessary to disconnect the TCM electrical connectors in order to remove the TCM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. Important: Remove any debris from around the TCM connector surfaces before servicing the TCM. Inspect the TCM module connector gaskets when diagnosing or replacing the TCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the TCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1231 6. Release the bracket TCM retainer (1). 7. Tilt the TCM (2) away from the ECM/TCM bracket. 8. Remove the TCM (1) from the TCM bracket (2). 9. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the ECM (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1232 10. Remove the ECM/TCM bracket retaining bolts (2). 11. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. Tighten the bolts to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1233 4. If the ECM was previously removed from the ECM/TCM bracket (2), install the ECM (3). 5. Insert the TCM (1) into the retaining slot of the ECM/TCM bracket (2). 6. Secure the TCM (2) to the ECM/TCM mounting bracket ensuring the TCM retaining tab (1) is fully engaged. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 1234 7. Connect the ECM electrical connector (1) to the TCM (2) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. 12. If the TCM was replaced the replacement TCM must be programmed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Wiper and Washer Systems > Windshield Washer Relay > Component Information > Locations Windshield Washer Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Wiper and Washer Systems > Windshield Washer Relay > Component Information > Locations > Page 1239 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Wiper and Washer Systems > Windshield Washer Relay > Component Information > Locations > Page 1240 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Relays and Modules > Relays and Modules - Wiper and Washer Systems > Windshield Washer Relay > Component Information > Locations > Page 1241 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Global Positioning System Switch > Component Information > Service and Repair Global Positioning System Switch: Service and Repair ONSTAR BUTTON ASSEMBLY REPLACEMENT The OnStar (R) button assembly located on the inside rearview mirror can not be serviced separately. Should the button assembly need to be replaced, the entire inside rearview mirror assembly will need to be replaced. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Hood Sensor/Switch (For Alarm) > Component Information > Diagrams Hood Ajar Switch (With RPO Code UA2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Lock Cylinder Switch > Component Information > Locations Steering Wheel And Column Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Lock Cylinder Switch > Component Information > Locations > Page 1253 Passlock Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Pedal Positioning Sensor > Component Information > Locations Lower LF Of The Passenger Compartment - Pedal Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Pedal Positioning Sensor > Component Information > Locations > Page 1257 Pedal Positioning Sensor: Service and Repair BRAKE PEDAL POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the knee bolster trim panel. 2. Disconnect the brake pedal position sensor electrical connector. 3. Remove the brake pedal position sensor bolt. 4. Remove the brake pedal position sensor from the vehicle. INSTALLATION PROCEDURE 1. Install the brake pedal position sensor to the vehicle. 2. Install the brake pedal position sensor bolt. Tighten the bolt to 9 N.m (80 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 3. Connect the brake pedal position sensor electrical connector. 4. Install the knee bolster trim panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Pedal Positioning Switch > Component Information > Locations Left Side Of The I/P - Steering Column Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Pedal Positioning Switch > Component Information > Locations > Page 1261 Electronic Adjustable Pedals (EAP) Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Remote Switch, Audio - Stereo > Component Information > Technical Service Bulletins > Audio - Inadvertent Steering Wheel Button Activation Remote Switch: Technical Service Bulletins Audio - Inadvertent Steering Wheel Button Activation INFORMATION Bulletin No.: 08-08-44-028 Date: August 28, 2008 Subject: Information On Inadvertent Steering Wheel Control (SWC) Button Press Causing Radio Anomalies Models: 2009 and Prior GM Passenger Cars and Trucks (Including Saturn) 2009 and Prior HUMMER H2, H3 Models 2009 and Prior Saab 9-7X All Vehicles with Steering Wheel Controls This bulletin is being issued to provide a recommendation for vehicles with a customer concern of the radio station tuning changing by itself, volume changing by itself, radio changing by itself, or radio muting or going silent when driving and turning the steering wheel. The switches on the right hand side of the steering wheel are easily pressed and may inadvertently be pressed when turning the steering wheel. These concerns may be affected by the location of the steering wheel controls. Recommendation Do Not Replace The Radio 1. Please determine that the switch controls on the steering wheel are functioning correctly. 2. Ask the customer if their hand was in close proximity to the steering wheel controls when the condition happened. Explain to the customer that bumping the controls would have caused this undesired action. Explain to the customer the proper use and function of the steering wheel controls. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Tow Sensor, Antitheft > Component Information > Locations Rear Floor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Tow Sensor, Antitheft > Component Information > Locations > Page 1269 Inclination Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Tow Sensor, Antitheft > Component Information > Locations > Page 1270 Tow Sensor: Service and Repair THEFT DETERRENT INCLINATION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disarm the content theft deterrent (CTD) system. Refer to Content Theft Deterrent (CTD) Description and Operation. 2. Remove the right rear seat cushion. 3. Remove the communication interface module. 4. Remove the navigation control processor bracket. 5. Remove the right seat back. 6. Remove the right rear door sill plate. 7. Remove the lift gate door sill plate. 8. Remove the right center pillar trim panel. 9. Remove the right lower rear quarter trim panel. 10. Remove the right child restraint tether anchors. 11. Fold or prop the carpet to reveal the theft deterrent inclination sensor. 12. Disconnect the electrical connector from the sensor (1). 13. Lift the sensor upward in order to release the adhesive tape attaching the sensor to the floor panel. 14. Remove the sensor from the vehicle. INSTALLATION PROCEDURE 1. Clean the floor panel to ensure the mounting location is free of dirt or debris. 2. Remove the protective backing to the adhesive strip on the bottom of the sensor (1). 3. The mounting location for the sensor is on the floor panel, 55mm (2in) (A) forward of the electrical harness channel, 126mm (5in) (B) inboard from the electrical harness channel. Attach the sensor to the floor panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Accessories and Optional Equipment > Tow Sensor, Antitheft > Component Information > Locations > Page 1271 4. Connect the sensor (1) electrical sensor. 5. Position the carpet to the original location. 6. Install the right child restraint tether anchors. 7. Install the right lower rear quarter trim panel. 8. Install the right center pillar trim panel. 9. Install the lift gate door sill plate. 10. Install the right rear door sill plate. 11. Install the right seat back. 12. Install the navigation control processor bracket. 13. Install the communication interface module. 14. Install the right rear seat cushion. 15. Arm the CTD system and check for proper operation. Refer to Content Theft Deterrent (CTD) Description and Operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Hood Switch / Sensor > Hood Sensor/Switch (For Alarm) > Component Information > Diagrams Hood Ajar Switch (With RPO Code UA2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Pedal Positioning Sensor > Component Information > Locations Lower LF Of The Passenger Compartment - Pedal Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Pedal Positioning Sensor > Component Information > Locations > Page 1280 Pedal Positioning Sensor: Service and Repair BRAKE PEDAL POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the knee bolster trim panel. 2. Disconnect the brake pedal position sensor electrical connector. 3. Remove the brake pedal position sensor bolt. 4. Remove the brake pedal position sensor from the vehicle. INSTALLATION PROCEDURE 1. Install the brake pedal position sensor to the vehicle. 2. Install the brake pedal position sensor bolt. Tighten the bolt to 9 N.m (80 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 3. Connect the brake pedal position sensor electrical connector. 4. Install the knee bolster trim panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Pedal Positioning Switch > Component Information > Locations Left Side Of The I/P - Steering Column Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Pedal Positioning Switch > Component Information > Locations > Page 1284 Electronic Adjustable Pedals (EAP) Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Door Lock Switch > Component Information > Service and Repair > Switch Replacement - Door Lock and Side Window - Driver Power Door Lock Switch: Service and Repair Switch Replacement - Door Lock and Side Window Driver Switch Replacement - Door Lock and Side Window - Driver Removal Procedure 1. Lift up on the front edge of the switch panel in order to release the front retaining clip. 2. Lift up on the rear edge of the switch panel in order to release the 2 rear retaining clips. 3. If equipped, disconnect the electrical connectors from the driver door module (1). 4. If replacing only the driver door module, remove the module from the door trim panel. 5. Disconnect the remaining electrical connectors from the switch panel. 6. If replacing only the switch panel, retain the driver door module for transfer. 7. Remove the switch panel assembly from the vehicle Installation Procedure 1. Install the driver door module (1) to the door trim panel. 2. Connect the electrical connector to the driver door module. 3. If replacing the switch panel, connect the remaining electrical connectors. Important: When replacing the driver door module, the set up procedure must be performed. 4. If replacing the driver door module, program the driver door module. Refer to Service Programming System (SPS), See: Testing and Inspection/Programming and Relearning 5. Install the switch panel to the door trim panel, ensuring the front and rear retaining clips are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Door Lock Switch > Component Information > Service and Repair > Switch Replacement - Door Lock and Side Window - Driver > Page 1289 Power Door Lock Switch: Service and Repair Switch Replacement - Door Lock and Side Window Passenger Switch Replacement - Door Lock and Side Window - Passenger Removal Procedure 1. Lift up on the front edge of the switch panel in order to release the front retaining clip. 2. Lift up on the rear edge of the switch panel in order to release the 2 rear retaining clips. 3. If equipped, disconnect the electrical connectors from the passenger door module (1). 4. If replacing only the passenger door module, remove the module from the door trim panel. 5. Disconnect the remaining electrical connectors from the switch panel. 6. If replacing only the switch panel, retain the passenger door module for transfer. 7. Remove the switch panel assembly from the vehicle. Installation Procedure 1. Install the passenger door module (1) to the door trim panel. 2. Connect the electrical connector to the passenger door module. 3. If replacing the switch panel, connect the remaining electrical connectors. Important: When replacing the passenger door module, the set up procedure must be performed. 4. If replacing the passenger door module, program the passenger door module. Refer to Service Programming System (SPS), See: Testing and Inspection/Programming and Relearning 5. Install the switch panel to the door trim panel, ensuring the front and rear retaining clips are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Mirror Switch > Component Information > Service and Repair Power Mirror Switch: Service and Repair POWER MIRROR SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Carefully use a flat-bladed tool in order to release the outside mirror switch retaining tabs from the trim panel. 2. Remove the outside mirror switch from the trim panel. 3. Disconnect the electrical connector from the power folding mirror switch. INSTALLATION PROCEDURE 1. Connect the electrical connector to the power folding mirror switch. 2. Position the power folding mirror switch to the door trim panel. 3. Apply downward pressure to the power folding mirror switch, ensuring the retaining tabs are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Motor Position Sensor > Component Information > Locations Power Seat Motor Position Sensor: Locations Under Driver Seat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Motor Position Sensor > Component Information > Locations > Page 1296 Behind Driver Seat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Motor Position Sensor > Component Information > Locations > Page 1297 Power Seat Motor Position Sensor: Diagrams Lumbar Horizontal Position Sensor - Driver (w/Memory) Seat Position Sensor - Front (w/Memory) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Motor Position Sensor > Component Information > Locations > Page 1298 Seat Position Sensor - Horizontal (w/Memory) Seat Position Sensor - Rear (w/Memory) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Motor Position Sensor > Component Information > Locations > Page 1299 Seat Position Sensor - Recline (w/Memory) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Locations Power Seat Switch: Locations Driver Seat Switches (With RPO Code AR9) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Locations > Page 1303 Passenger Seat Switches (With RPO Code V40) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Locations > Page 1304 Power Seat Switch: Diagrams Lumbar Adjuster Switch - Driver (With RPO Code AR9) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Locations > Page 1305 Lumbar Adjuster Switch - Passenger (With RPO Code V40) Seat Adjuster Switch - Driver Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Locations > Page 1306 Seat Adjuster Switch - Passenger (With RPO Code V40) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Service and Repair > Seat Switch Bezel Replacement Power Seat Switch: Service and Repair Seat Switch Bezel Replacement Seat Switch Bezel Replacement Removal Procedure 1. Remove the 3 screws that retain the switch bezel to the seat. 2. Partially remove the switch bezel from the seat. 3. Remove the seat switches from the switch bezel by releasing the retaining tabs. 4. Remove the lumbar switch from the switch bezel by releasing the retaining tabs. 5. Remove the switch bezel from the seat. Installation Procedure 1. Install the lumbar switch to the switch bezel, verifying that the retaining tabs are fully seated. 2. Install the seat switches to the switch bezel, verifying that the retaining tabs are fully seated. Notice: Refer to Fastener Notice in Service Precautions. 3. Install the switch bezel to the seat with the 3 screws. Tighten the front seat switch bezel screws to 3 N.m (26 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Service and Repair > Seat Switch Bezel Replacement > Page 1309 Power Seat Switch: Service and Repair Seat Switch Replacement - Power Seat Switch Replacement - Power Removal Procedure 1. Remove the switch bezel assembly from the seat assembly. 2. Remove the buttons from the switch. 3. Release the tabs that retain the seat switch to the seat bezel assembly. 4. Disconnect the electrical connector from the switch. 5. Remove the seat switch from the seat bezel assembly. Installation Procedure 1. Connect the electrical connector to the switch. 2. Install the seat switch to the seat bezel assembly. Verify that the retaining tabs are fully seated. 3. Install the buttons on the switch. 4. Install the switch bezel assembly to the seat assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Seat Switch > Component Information > Service and Repair > Seat Switch Bezel Replacement > Page 1310 Power Seat Switch: Service and Repair Lumbar Switch Replacement - Front LUMBAR SWITCH REPLACEMENT - FRONT REMOVAL PROCEDURE 1. Remove the switch bezel assembly from the seat. 2. Remove the power seat switch. 3. Release the tabs that retain the lumbar switch to the switch bezel assembly. 4. Disconnect the electrical connector from the lumbar switch. 5. Remove the lumbar switch from the switch bezel assembly. INSTALLATION PROCEDURE 1. Connect the electrical connector to the lumbar switch. 2. Install the lumbar switch to the switch bezel assembly, verifying that the retaining tabs are fully seated. 3. Install the power seat switch. 4. Install the switch bezel assembly to the seat. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Power Trunk / Liftgate Hazard Sensor > Component Information > Description and Operation Power Trunk / Liftgate Hazard Sensor: Description and Operation REAR HATCH/GATE AJAR INDICATOR DESCRIPTION AND OPERATION GATE AJAR INDICATOR The instrument panel cluster (IPC) illuminates the GATE AJAR indicator when the liftgate module (LGM) detects that the liftgate or liftglass is ajar or open. The IPC receives a class 2 message from the LGM requesting illumination. If the vehicle is in the forward or reverse gear position, the LGM activates an audible warning. REAR ACCESS OPEN MESSAGE The REAR ACCESS OPEN message will be displayed on the driver information center (DIC) whenever the liftgate or liftglass is open while the ignition is in the RUN position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Seat Heater Switch > Component Information > Locations Seat Heater Switch: Locations Driver Door Module (DDM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Seat Heater Switch > Component Information > Locations > Page 1317 Front Passenger Door Module (FPDM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Seat Memory Switch > Component Information > Service and Repair Seat Memory Switch: Service and Repair MEMORY SEAT SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Lift up on the front edge of the door lock and side window switch (1) in order to release the front retaining clip. 2. Lift up on the rear edge of the switch panel in order to release the 2 rear retaining clips. 3. Remove the electrical connector (2) from the memory seat switch. 4. Remove the memory seat switch from the lock and door lock and side window switch (1). INSTALLATION PROCEDURE 1. Position the memory seat switch to the lock and door lock and side window switch (1). 2. Connect the electrical connector (2) to the memory seat switch. 3. Install the door lock and side window switch (1). Verify that the front retaining clips and the rear retaining clips are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Sunroof / Moonroof Switch > Component Information > Locations Overhead Console Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Sunroof / Moonroof Switch > Component Information > Locations > Page 1324 Sunroof Switch (With RPO Code CF5) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Body and Frame > Sunroof / Moonroof Switch > Component Information > Locations > Page 1325 Sunroof / Moonroof Switch: Service and Repair SUNROOF SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Remove the overhead console in order to access the sunroof switch. 2. Disconnect the electrical connector from the sunroof switch. 3. With a flat bladed tool carefully release the tabs that retain the sunroof switch to the overhead console. 4. Remove the sunroof switch from the overhead console. INSTALLATION PROCEDURE 1. Position the sunroof switch alignment tabs to the slots in the console. 2. Install the sunroof switch into the console, ensuring that the retaining tabs are fully seated. 3. Connect the electrical connector to the sunroof switch. 4. Install the overhead console to the roof. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Brake Fluid Level Sensor/Switch > Component Information > Locations Brake Fluid Level Sensor/Switch: Locations Hydraulic Brake Component Views Brake Fluid Level Switch 1 - Brake Fluid Level Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Brake Fluid Level Sensor/Switch > Component Information > Locations > Page 1330 Brake Fluid Level Sensor/Switch: Diagrams Brake Fluid Level Switch Brake Fluid Level Switch Brake Fluid Level Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Brake Fluid Level Sensor/Switch > Component Information > Locations > Page 1331 Brake Fluid Level Sensor/Switch: Service and Repair Master Cylinder Fluid Level Sensor Replacement Removal Procedure 1. Disconnect the electrical connector from the fluid level sensor. Important: When performing the following service procedure, it is NOT necessary to drain the master cylinder reservoir. 2. Using pair of needle nose pliers, compress the locking tabs for the fluid sensor located at the opposite side of the master cylinder. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Brake Fluid Level Sensor/Switch > Component Information > Locations > Page 1332 3. Remove the fluid level sensor from the master cylinder reservoir. Installation Procedure Important: Ensure that the fluid sensor is fully seated before releasing the snap ring. 1. Install the fluid level sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Brake Fluid Level Sensor/Switch > Component Information > Locations > Page 1333 2. Install the electrical connector to the fluid level sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Lateral Accelerometer > Component Information > Diagrams Lateral Accelerometer: Diagrams Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Lateral Accelerometer > Component Information > Diagrams > Page 1337 Lateral Accelerometer: Service and Repair Yaw Rate Sensor/Lateral Accelerometer Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Parking Brake Warning Switch > Component Information > Locations > Component Locations Parking Brake Warning Switch: Component Locations Hydraulic Brake Component Views Park Brake Switch 2 - Park Brake Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Parking Brake Warning Switch > Component Information > Locations > Component Locations > Page 1342 Parking Brake Warning Switch: Connector Locations Park Brake Switch Park Brake Switch Park Brake Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Steering Angle Sensor, Traction Control > Component Information > Diagrams Steering Angle Sensor: Diagrams Steering Wheel Speed/Position Sensor Steering Wheel Speed/Position Sensor Steering Wheel Speed/Position Sensor Steering Wheel Speed/Position Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Traction Control Switch > Component Information > Diagrams Traction Control Switch: Diagrams Traction Control Switch Traction Control Switch Traction Control Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Locations Wheel Speed Sensor: Locations Antilock Brake System Component Views Front Hubs And Rotors 2 - Wheel Speed Sensor - LF 3 - Wheel Speed Sensor - RF Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF Wheel Speed Sensor: Diagrams Wheel Speed Sensor - LF Wheel Speed Sensor - LF Wheel Speed Sensor Wheel Speed Sensor - LF Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF > Page 1354 Wheel Speed Sensor: Diagrams Wheel Speed Sensor - LR Wheel Speed Sensor - LR Wheel Speed Sensor Wheel Speed Sensor - LR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF > Page 1355 Wheel Speed Sensor: Diagrams Wheel Speed Sensor - RF Wheel Speed Sensor - RF Wheel Speed Sensor Wheel Speed Sensor - RF Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF > Page 1356 Wheel Speed Sensor: Diagrams Wheel Speed Sensor - RR Wheel Speed Sensor - RR Wheel Speed Sensor Wheel Speed Sensor - RR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement Wheel Speed Sensor: Service and Repair Wheel Speed Sensor Replacement Wheel Speed Sensor Replacement Removal Procedure 1. Raise the vehicle. 2. Remove tire and wheel. 3. Remove the brake rotor. 4. Remove the wheel speed sensor wiring harness retainers. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1359 5. Disconnect the wheel speed sensor electrical connector. 6. Remove the sensor mounting screw. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1360 NOTICE: Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device. Prying will cause the sensor body to break off in the bore. NOTICE: Do not attempt to remove the stainless steel shim from the bearing assembly. The shim is permanently attached. If the shim is damaged or bent, replace the bearing assembly. Failure to comply will result in diminished sensor and ABS performance. Important: The wheel speed sensor mounts into a bore that leads to the center of the sealed bearing. Use caution when cleaning or working around the bore. Do not contaminate the lubricant inside the sealed bearing. Failure to do so can lead to premature bearing failure. 7. Remove wheel speed sensor from hub and bearing assembly. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1361 Important: The new speed sensor will have a new O-ring. Dispose of the old O-ring. Lubricate the new O-ring lightly with bearing grease prior to installation. You may also lubricate the sensor just above and below the new O-ring. DO NOT lubricate the bore. 1. Install the speed sensor into the hub and bearing assembly. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the speed sensor mounting screw. ^ Tighten the speed sensor mounting screw to 18 Nm (13 ft. lbs.). 3. Reconnect the wheel speed sensor electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1362 Important: The new speed sensor has new mounting clips already installed on the wire. DO NOT reuse the old clips. 4. Install wheel speed sensor wiring harness to the frame and control arm. 5. Install the brake rotor. 6. Install tire and wheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1363 Wheel Speed Sensor: Service and Repair Wheel Speed Sensor Replacement - Rear Wheel Speed Sensor Replacement - Rear Removal Procedure 1. Raise the vehicle. 2. Disconnect the electrical connector. 3. Remove the wheel speed sensor retaining bolt. 4. Remove the wheel speed sensor. Installation Procedure 1. Using a twisting motion, install the wheel speed sensor until fully seated. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the wheel speed sensor retaining bolt. ^ Tighten the wheel speed sensor retaining bolt to 13 Nm (115 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1364 3. Connect the electrical connector. 4. Lower the vehicle. 5. Perform a low speed test to ensure the wheel speed sensor is functioning properly: 1. Start the engine and allow it to idle. 2. Verify the ABS indicator or the traction assist indicator remains illuminated. 3. If the ABS indicator or the traction assist indicator remains illuminated, DO NOT proceed to drive the vehicle until it is diagnosed and repaired. Check the wheel speed sensor electrical connector to ensure it is not damaged and is installed properly. If the lamp remains illuminated, refer to Symptoms - Antilock Brake System. See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and Inspection/Symptom Related Diagnostic Procedures 4. Select a smooth, dry, clean, and level road or large lot that is as free of traffic and obstacles as possible. 5. Drive the vehicle and maintain a speed of at least 16 km/h (10 mph) for at least 5 seconds. 6. Stop the vehicle and check to see if the ABS indicator or the traction assist indicator is illuminated. 7. If an indicator is illuminated, refer to Diagnostic Starting Point - Antilock Brake System. See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1365 Wheel Speed Sensor: Service and Repair Wheel Speed Sensor Ring Replacement - Rear Wheel Speed Sensor Ring Replacement - Rear ^ Tools Required J 8092 Driver Handle - J 21128 Axle Pinion Oil Seal Installer - J 23690 Bearing Installer - J 2619-01 Slide Hammer - J 45857 Tone Wheel and/or Bearing Remover - J 45860 Tone Ring Installer Removal Procedure 1. Raise the vehicle. 2. Remove the tire and wheel assembly. 3. Remove the rear wheel speed sensor. 4. Remove the rear axle housing cover. 5. Remove the axle shaft. 6. Remove the axle shaft seal, the bearing and the wheel speed sensor ring from the axle housing using the J 45857 (1) and the J 2619-01 (2). Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 1366 1. Install the wheel speed sensor ring using the J 45860 (1) and the J 8092 (2). 2. Drive the wheel speed sensor ring into the axle housing until the tool bottoms against the tube. 3. Install the axle shaft bearing using the J 23690 (1) and the J 8092 (2). 4. Drive the axle shaft bearing into the axle housing until the tool bottoms against the tube. 5. Install the axle shaft seal using the J 21128. 6. Drive the tool into the bore until the axle shaft seal bottoms flush with the tube. 7. Install the axle shaft. 8. Install the rear axle housing cover. 9. Install the rear wheel speed sensor. 10. Install the tire and wheel assembly. 11. Fill the rear axle. Refer to Lubricant Replacement Rear Drive Axle. 12. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Yaw Rate Sensor > Component Information > Diagrams Yaw Rate Sensor: Diagrams Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Brakes and Traction Control > Yaw Rate Sensor > Component Information > Diagrams > Page 1370 Yaw Rate Sensor: Service and Repair Yaw Rate Sensor/Lateral Accelerometer Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1381 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1382 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1383 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1384 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1390 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1391 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1392 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1393 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Other Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear Clutch: All Technical Service Bulletins A/T - No Movement in Drive or 3rd Gear TECHNICAL Bulletin No.: 08-07-30-027 Date: June 04, 2008 Subject: No Movement When Transmission is Shifted to Drive or Third - Normal Operation When Shifted to Second, First or Reverse (Replace Forward Sprag Assembly) Models: 1982 - 2005 GM Passenger Cars and Light Duty Trucks 2006 - 2007 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet SSR 2006 - 2008 Chevrolet Avalanche, Colorado, Express, Silverado Classic, Silverado, Suburban, Tahoe, TrailBlazer 2006 GMC Yukon Denali, Yukon Denali XL 2006 - 2008 GMC Canyon, Envoy, Savana, Sierra Classic, Sierra, Yukon, Yukon XL 2006 Pontiac GTO 2006 - 2007 HUMMER H2 2006 - 2008 HUMMER H3 2006 - 2008 Saab 9-7X with 4L60, 4L60E, 4L65E or 4L70E Automatic Transmission (RPOs MD8, M30, M32, M33 or M70) Condition Some customers may comment that the vehicle has no movement when the transmission is shifted to DRIVE or THIRD position, but there is normal operation when it is shifted to SECOND, FIRST or REVERSE position. Cause This condition may be caused by a damaged forward sprag assembly (642). Correction When inspecting the sprag, it is important to test the sprag for proper operation by holding the outer race (644) with one hand while rotating the input sun gear (640) with the other hand. The sun gear should rotate only in the counterclockwise direction with the input sun gear facing upward. If the sprag rotates in both directions or will not rotate in either direction, the sprag elements should be inspected by removing one of the sprag assembly retaining rings (643). Refer to SI Unit Repair section for forward clutch sprag disassembly procedures. If the sprag is found to be damaged, make repairs to the transmission as necessary. A new forward roller clutch sprag assembly is now available from GMSPO. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Other Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 1399 If clutch debris is found, it is also very important to inspect the Pressure Control (PC) solenoid valve (377) fluid screens. Clean or replace the PC solenoid (377) as necessary. It is also important to flush and flow check the transmission oil cooler using J45096. Refer to SI Automatic Transmission Oil Cooler Flushing and Flow Test for the procedure. The notches above each sprag must point up as shown when assembled into the outer race. Bearing Assembly, Input Sun Gear Snap Ring, Overrun Clutch Hub Retaining Hub, Overrun Clutch Wear Plate, Sprag Assembly Retainer and Race Assembly, Sprag Forward Sprag Assembly Retainer Rings, Sprag Assembly Outer Race, Forward Clutch Washer, Thrust (Input Carrier to Race) The following information applies when this sprag is used in 1982-86 transmissions. The new design sprag can be used on models 1982 through 1986, by replacing the entire assembly (637 - 644). Individual components are NOT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Other Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 1400 interchangeable. Important: The wear plate (640) and input thrust washer (660) are not required with the new sprag. Use of the thrust washer and wear plate with the new sprag assembly will cause a misbuild (correct end play cannot be obtained). Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Other Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 08-07-30-009B > May > 08 > A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks Clutch: All Technical Service Bulletins A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Other Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 1410 If clutch debris is found, it is also very important to inspect the Pressure Control (PC) solenoid valve (377) fluid screens. Clean or replace the PC solenoid (377) as necessary. It is also important to flush and flow check the transmission oil cooler using J45096. Refer to SI Automatic Transmission Oil Cooler Flushing and Flow Test for the procedure. The notches above each sprag must point up as shown when assembled into the outer race. Bearing Assembly, Input Sun Gear Snap Ring, Overrun Clutch Hub Retaining Hub, Overrun Clutch Wear Plate, Sprag Assembly Retainer and Race Assembly, Sprag Forward Sprag Assembly Retainer Rings, Sprag Assembly Outer Race, Forward Clutch Washer, Thrust (Input Carrier to Race) The following information applies when this sprag is used in 1982-86 transmissions. The new design sprag can be used on models 1982 through 1986, by replacing the entire assembly (637 - 644). Individual components are NOT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Other Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 1411 interchangeable. Important: The wear plate (640) and input thrust washer (660) are not required with the new sprag. Use of the thrust washer and wear plate with the new sprag assembly will cause a misbuild (correct end play cannot be obtained). Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 1416 Engine Coolant Temperature (ECT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 1417 Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Turn OFF the ignition. NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 4. Lower the vehicle. 5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1). 6. Remove the ECT sensor. INSTALLATION PROCEDURE 1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. - Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 1418 2. Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the sensor to 20 N.m (15 lb ft). 3. Connect the ECT sensor electrical connector (1). 4. Refill the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sender > Component Information > Diagrams Engine Oil Pressure (EOP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: Customer Interest Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 1431 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: All Technical Service Bulletins Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 1437 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Other Service Bulletins for Oil Pressure Sensor: > 06-03-09-006B > Dec > 08 > Suspension - Rear Suspension Is Low/Sagging/Uneven Suspension Control Module: All Technical Service Bulletins Suspension - Rear Suspension Is Low/Sagging/Uneven ENGINEERING INFORMATION Bulletin No.: 06-03-09-006B Date: December 15, 2008 Subject: EI06006 - Rear Suspension Uneven, Sagging, Low (Recalibrate Air Spring Sensor) Models: 2006-2007 Buick Rainier 2006-2007 Chevrolet TrailBlazer SS 2006-2007 GMC Envoy, Envoy XL 2006-2007 Saab 9-7X with Suspension Pkg - Rear Load Leveling (RPO G67) Supercede: This bulletin is being revised to update the labor operation in the warranty information. Please discard Corporate Bulletin Number 06-03-09-006A (Section 03 - Suspension). Condition Some customers may comment on the rear suspension being uneven or sagging. Correction DO NOT REPLACE THE COMPRESSOR. Based on technician feedback, engineering has determined that the customer's concern can be corrected by recalibrating the air spring sensor. Refer to the Trim Height Uneven or Low diagnostics and Air Spring Sensor Calibration procedure found in SI. Warranty Information (excluding Saab U.S. Models) Warranty Information (Saab U.S. Models) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 1448 Oil Pressure Sensor: Service and Repair Engine Oil Pressure Sensor and/or Switch Replacement ^ Tools Required J 41712 Oil Pressure Switch Socket Removal Procedure 1. Remove the intake manifold. 2. Disconnect the oil pressure sensor electrical connector (1). 3. Using J 41712 or equivalent, remove the oil pressure sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 1449 1. Apply sealant to the threads of the oil pressure sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Notice: Refer to Fastener Notice in Service Precautions. 2. Using J 41712 or equivalent, install the oil pressure sensor. ^ Tighten the sensor to 20 Nm (15 ft. lbs.). 3. Connect the oil pressure sensor electrical connector (1). 4. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Blower Motor Switch > Component Information > Locations Front Auxiliary Blower Motor Switch (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Blower Motor Switch > Component Information > Diagrams > HVAC System - Manual Blower Motor Switch - Front Auxiliary (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Blower Motor Switch > Component Information > Diagrams > HVAC System - Manual > Page 1456 Blower Motor Switch - Front Auxiliary (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Blower Motor Switch > Component Information > Service and Repair > HVAC System - Manual Blower Motor Switch: Service and Repair HVAC System - Manual FRONT AUXILIARY BLOWER MOTOR SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Press downward and to the right on the front auxiliary blower motor switch. 2. Remove the front auxiliary blower motor switch from the console. 3. Disconnect the electrical connector from the front auxiliary blower motor switch. INSTALLATION PROCEDURE 1. Connect the electrical connector to the front auxiliary blower motor switch. 2. Install the front auxiliary blower motor switch to console. 3. Press the front auxiliary blower motor switch into the console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Blower Motor Switch > Component Information > Service and Repair > HVAC System - Manual > Page 1459 Blower Motor Switch: Service and Repair HVAC System - Automatic FRONT AUXILIARY BLOWER MOTOR SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Press downward and to the right on the front auxiliary blower motor switch. 2. Remove the front auxiliary blower motor switch from the console. 3. Disconnect the electrical connector from the front auxiliary blower motor switch. INSTALLATION PROCEDURE 1. Connect the electrical connector to the front auxiliary blower motor switch. 2. Install the front auxiliary blower motor switch to console. 3. Press the front auxiliary blower motor switch into the console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Locations Discharge Air Temperature Sensor / Switch: Locations Instrument Panel Carrier - Center Section Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Locations > Page 1463 Instrument Panel Carrier - Air Duct Instrument Panel Carrier - Right Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Locations > Page 1464 Discharge Air Temperature Sensor / Switch: Diagrams Air Temperature Sensor - Lower Left Air Temperature Sensor - Lower Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Locations > Page 1465 Air Temperature Sensor - Upper Left Air Temperature Sensor - Upper Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Service and Repair > Air Temperature Sensor - Upper Right Discharge Air Temperature Sensor / Switch: Service and Repair Air Temperature Sensor - Upper Right AIR TEMPERATURE SENSOR REPLACEMENT - UPPER RIGHT REMOVAL PROCEDURE 1. Remove the radio. 2. Disconnect the electrical connector (2) from the air temperature sensor-upper right (1). 3. Remove the air temperature sensor-upper right (1) by turning the sensor clockwise and pulling out. INSTALLATION PROCEDURE 1. Install the air temperature sensor-upper right (1). 2. Connect the electrical connector (2) to the air temperature sensor-upper right (1). 3. Install the radio. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Service and Repair > Air Temperature Sensor - Upper Right > Page 1468 Discharge Air Temperature Sensor / Switch: Service and Repair Air Temperature Sensor - Upper Left AIR TEMPERATURE SENSOR REPLACEMENT - UPPER LEFT REMOVAL PROCEDURE 1. Remove the radio. 2. Remove the HVAC control module. 3. Remove the air temperature sensor. 4. Disconnect the electrical connector (2) from the upper air temperature sensor (1). INSTALLATION PROCEDURE 1. Install the upper air temperature sensor (1) to the air duct (2). 2. Connect the electrical connector (2) to the upper air temperature sensor (1). 3. Install the upper air temperature sensor. 4. Install the HVAC control module. 5. Install the radio. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Service and Repair > Air Temperature Sensor - Upper Right > Page 1469 Discharge Air Temperature Sensor / Switch: Service and Repair Air Temperature Sensor - Lower Left AIR TEMPERATURE SENSOR REPLACEMENT - LOWER LEFT REMOVAL PROCEDURE 1. Remove the I/P assembly. 2. Disconnect the electrical connector from the air temperature sensor-lower left (2). 3. Remove the air temperature sensor-lower left. INSTALLATION PROCEDURE 1. Install the air temperature sensor-lower left (2). 2. Connect the electrical connector to the air temperature sensor-lower left. 3. Install the I/P assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Discharge Air Temperature Sensor / Switch, HVAC > Component Information > Service and Repair > Air Temperature Sensor - Upper Right > Page 1470 Discharge Air Temperature Sensor / Switch: Service and Repair Air Temperature Sensor - Lower Right AIR TEMPERATURE SENSOR REPLACEMENT - LOWER RIGHT REMOVAL PROCEDURE 1. Remove the passenger side closeout panel. 2. Remove the I/P lower closeout panel. 3. Disconnect the electrical connector (3) from the air temperature sensor-lower right (2). 4. Remove the air temperature sensor-lower right (2). INSTALLATION PROCEDURE 1. Install the air temperature sensor-lower right (2). 2. Connect the electrical connector (3) to the air temperature sensor-lower right (2). 3. Install the I/P lower closeout panel. 4. Install the passenger side closeout panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Refrigerant Pressure Sensor / Switch, HVAC > Low Pressure Sensor / Switch, HVAC > Component Information > Locations RR Of The Engine Compartment Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Refrigerant Pressure Sensor / Switch, HVAC > Low Pressure Sensor / Switch, HVAC > Component Information > Diagrams > HVAC System - Manual A/C Low Pressure Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Refrigerant Pressure Sensor / Switch, HVAC > Low Pressure Sensor / Switch, HVAC > Component Information > Diagrams > HVAC System - Manual > Page 1477 A/C Low Pressure Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Refrigerant Pressure Sensor / Switch, HVAC > Low Pressure Sensor / Switch, HVAC > Component Information > Diagrams > Page 1478 Low Pressure Sensor / Switch: Service and Repair AIR CONDITIONING (A/C) LOW PRESSURE SWITCH REPLACEMENT TOOLS REQUIRED J 39400-A Halogen Leak Detector REMOVAL PROCEDURE 1. Disconnect the A/C low pressure switch electrical connector. 2. Remove the A/C low pressure switch (2) from the accumulator (1). 3. Remove and discard the O-ring seal from the A/C low pressure switch port on the accumulator. INSTALLATION PROCEDURE 1. Install the new O-ring seal. 2. Install the A/C low pressure switch (2) to the accumulator (1). Tighten the A/C low pressure switch to 4.8 N.m (42 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 3. Connect the A/C low pressure switch electrical connector. 4. Leak test the fittings of the components using the J 39400-A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Solar Sensor, HVAC > Component Information > Diagrams Ambient Light/Sunload Sensor Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - HVAC > Solar Sensor, HVAC > Component Information > Diagrams > Page 1482 Solar Sensor: Service and Repair SUN LOAD SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the I/P upper trim pad. 2. Remove the sun load sensor from the I/P upper trim pad by turning counter clockwise. 3. Disconnect the electrical connector from the sun load sensor. INSTALLATION PROCEDURE 1. Connect the electrical connector to the sun load sensor. 2. Install the sun load sensor to the I/P upper trim pad by turning clockwise. 3. Install the I/P upper trim pad. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Fuel Gauge Sender > Component Information > Diagrams Fuel Pump And Sender Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Fuel Gauge Sender > Component Information > Diagrams > Page 1487 Fuel Gauge Sender: Description and Operation FUEL SENDER ASSEMBLY The fuel sender assembly consists of the following major components: - The fuel level sensor - The fuel tank pressure (FTP) sensor - The fuel tank fuel pump module - The fuel strainer - The fuel filter Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Fuel Gauge Sender > Component Information > Diagrams > Page 1488 Fuel Gauge Sender: Service and Repair FUEL SENDER ASSEMBLY REPLACEMENT TOOLS REQUIRED J 45722 Fuel Tank Sending Unit Wrench REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Remove the fuel feed (1) and EVAP (2) lines from the fuel sender assembly. 3. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. Turn the fuel sender lock ring in a counterclockwise direction. NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring. - Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints. IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Fuel Gauge Sender > Component Information > Diagrams > Page 1489 4. Remove the fuel sender assembly (2) and seal (3). Discard the seal. 5. Clean the fuel sender sealing surfaces (4). CAUTION: Refer to Fuel Storage Caution. 6. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. IMPORTANT: Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped. - Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring. - Check the lock ring for flatness. 7. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement. 8. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Fuel Gauge Sender > Component Information > Diagrams > Page 1490 1. Install a NEW seal (3) onto the fuel tank. IMPORTANT: Never reuse the old seal or a fuel leak may occur. Always use a NEW seal. 2. Install the fuel sender assembly (2). IMPORTANT: Place the fuel pump strainer in a horizontal position when you install the fuel sender in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm. 3. Use the J 45722 in order to install the fuel sender lock ring. Turn the fuel sender lock ring in a clockwise direction. IMPORTANT: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. Do not apply any type of lubrication in the seal groove. Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Fuel Gauge Sender > Component Information > Diagrams > Page 1491 4. Install the fuel feed (1) and EVAP (2) lines to the sender assembly. 5. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Outside Temperature Display Sensor > Component Information > Service and Repair Outside Temperature Display Sensor: Service and Repair AMBIENT AIR TEMPERATURE SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the front grille. 2. Remove the sensor (1) from the panel assembly (2). 3. Disconnect the electrical connector from the sensor (1). INSTALLATION PROCEDURE 1. Position the sensor to the panel assembly. 2. Connect the electrical connector to the sensor (1). 3. Install the sensor (1) to the panel assembly (2). 4. Install the front grille. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Parking Brake Warning Switch > Component Information > Locations > Component Locations Parking Brake Warning Switch: Component Locations Hydraulic Brake Component Views Park Brake Switch 2 - Park Brake Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Instrument Panel > Parking Brake Warning Switch > Component Information > Locations > Component Locations > Page 1499 Parking Brake Warning Switch: Connector Locations Park Brake Switch Park Brake Switch Park Brake Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Ambient Light Sensor > Component Information > Locations Dash Panel Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Ambient Light Sensor > Component Information > Locations > Page 1504 Ambient Light Sensor: Diagrams Ambient Light Sensor (With RPO Code CJ3) Ambient Light/Sunload Sensor Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Ambient Light Sensor > Component Information > Locations > Page 1505 Ambient Light Sensor: Service and Repair AMBIENT LIGHT SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the windshield garnish moldings. 2. Remove the trim pad. 3. Disconnect the electrical connector from the sensor. IMPORTANT: Cover the windshield defrost vents with clean shop rags. 4. In order to remove the sensor from the trim pad, rotate the sensor counter-clockwise 1/4 turn . 5. Remove the sensor from the trim pad. INSTALLATION PROCEDURE 1. Position the sensor to the trim pad. 2. In order to install the sensor to the trim pad, rotate the sensor clockwise 1/4 turn . 3. Position the trim pad to the upper portion of the instrument panel (IP). 4. Connect the electrical connector to the sensor. 5. Remove the shop rags from the windshield defrost vents. 6. Install the trim pad to the IP. 7. Install the windshield garnish moldings. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Brake Light Switch > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Brake Light Switch > Component Information > Locations > Page 1509 Stop Lamp Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Brake Light Switch > Component Information > Locations > Page 1510 Brake Light Switch: Service and Repair STOP LAMP SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Remove the left sound insulator. 2. Remove the pushrod retainer (3) from the brake pedal pin (4). 3. Remove the stop lamp switch (1) and the pushrod (2) from the brake pedal pin (4). 4. Disconnect the stop lamp switch (1) electrical connector. 5. Remove the stop lamp switch from the vehicle. INSTALLATION PROCEDURE 1. Install the electrical connector to the stop lamp switch (1). 2. Position the stop lamp switch (1) on the pushrod (2) and install the assembly on the brake pedal pin. 3. Install the pushrod retainer (3) to the brake pedal pin (4). The retainer will snap into place. 4. Install the left sound insulator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Combination Switch > Component Information > Locations Steering Wheel And Column Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Combination Switch > Component Information > Locations > Page 1514 Combination Switch: Diagrams Turn Signal/Multifunction Switch C1 Turn Signal/Multifunction Switch C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Combination Switch > Component Information > Locations > Page 1515 Turn Signal/Multifunction Switch C3 Turn Signal/Multifunction Switch C4 (With RPO Code K34) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Headlamp Switch > Component Information > Locations Headlamp Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Headlamp Switch > Component Information > Locations > Page 1519 Headlamp Switch: Diagrams Headlamp Switch C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Headlamp Switch > Component Information > Locations > Page 1520 Headlamp Switch C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Headlamp Switch > Component Information > Locations > Page 1521 Headlamp Switch: Service and Repair HEADLAMP SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Open the left instrument panel (IP) access cover. 2. Reach into the access hole and release the 4 retaining tabs located on the headlamp switch behind the IP. 3. Remove the headlamp switch from the IP, through the IP access hole. 4. Disconnect the electrical connectors from the headlamp switch. 5. Remove the headlamp from the IP. INSTALLATION PROCEDURE 1. Position the headlamp switch near the access hole. 2. Connect the electrical connectors to the headlamp switch. 3. Install the headlamp switch to the IP. Ensure that the retaining tabs are fully seated. 4. Install the left IP access cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > Customer Interest for Horn Switch: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad Horn Switch: Customer Interest Horn - Inoperative When Pressing Horn Pad TECHNICAL Bulletin No.: 07-08-54-001C Date: October 17, 2008 Subject: EI07279 - Horn Inoperative from Steering Wheel Horn Pad (Ground Path Repair Procedure) Models: 2006-2007 Buick Rainier 2006 Chevrolet TrailBlazer EXT 2006-2009 Chevrolet TrailBlazer 2006 GMC Envoy XL, Envoy XUV 2006-2009 GMC Envoy, Envoy Denali Supercede: This bulletin is being revised to provide field fix information. Please discard Corporate Bulletin Number 07-08-54-001B (Section 08 - Body and Accessories). Condition Important: If the horn does NOT work from the key fob horn button, disregard this bulletin and proceed with diagnosis/repair according to SI. Some customers may comment that the horn is inoperative from the horn pad on the steering wheel. Cause The general cause of this condition is high resistance in the ground path through the steering column that energizes the horn relay. The key fob panic button uses a different ground path and is not affected. A number of locations in the circuit have been identified as sources of the high resistance. It is often difficult to pinpoint the specific location of the high resistance because the condition is usually intermittent. Attempting to discover the location can be frustrating because as circuit components are moved, the condition will often disappear. A few locations have been identified as frequent contributors to the problem. Correction Complete the following steps to diagnose and repair this condition: 1. Does the horn work by depressing the button(s) on the key fob? ^ Yes - proceed with step 2. ^ No - do not proceed with this bulletin. Diagnose and repair using information found in SI. 2. To aid in the diagnosis and to avoid disturbing others, disconnect the wiring harness from the horn assembly and insert appropriate connectors to monitor the voltage with a multi-meter or a test light. If the horn pad is currently working, rotate the steering wheel lock to lock while depressing the horn pad to determine if there are any spots in the rotation where the horn pad quits working. Caution: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling. Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > Customer Interest for Horn Switch: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 1530 repairs. 3. Remove the Inflatable Restraint Steering Wheel Module using the procedure found in Service Information. Remove the horn contacts from the steering wheel. Clean the brass contact on the end of the red wires with an abrasive pad. If possible, remove any contamination present on the mating contact on the cancel cam (inside the black tube). Also clean the four copper rivets embedded in the steering wheel frame. Apply GM Dielectric Lubricant to all the contacts to protect against reoccurrence of the corrosion. Refer to the graphic. 4. Reinstall the horn contacts and the Inflatable Restraint Steering Wheel Module and test for proper operation of the horn pad. Test for proper operation of the horn pad through the entire steering wheel rotation. Does the horn pad work properly? ^ Yes - repair is complete. ^ No - proceed with step 5. 5. Is the inoperative condition only present at certain steering wheel positions? ^ Yes - proceed with step 6. ^ No - proceed with step 9. 6. Remove the steering column trim covers. Position the steering wheel on a dead spot. Ground a test light to the steering column frame close to the steering wheel. Probe the surface of the turn signal cancel cam with the test light. Does grounding the cam activate the horn? ^ Yes - this may mean that the contact of the cancel cam that mates to the horn contact wiring harness contact, may not be clean enough or that the cancel cam may need to be replaced. Repair as necessary. Procedure complete. ^ No - proceed with step 7.Turn Signal Cancel Cam: 7. Disconnect the wiring harness that goes to the top of the multi-function switch (connector X1). Using the grounded test light, touch the harness connection for pin G. Does grounding the pin activate the horn? ^ Yes - proceed with step 8. ^ No - try grounding the test light on a known good ground. If this activates the horn, proceed to step 9. If not, investigate a possible condition with the wiring harness or BCM with appropriate SI documents. 8. The condition lies either in the multi-function switch or the interface between the multi-function switch and the cancel cam. In some cases, removing the multi-function switch and clearing the horn contact that mates with the cancel cam (refer to the graphic) of debris and reinstalling the switch will eliminate the condition. In other cases, the cancel cam may be losing contact with the multi-function switch contact. If distortion in the cancel cam is present, it may be necessary to replace the cancel cam. Repair as necessary. Procedure complete. 9. Remove the left side IP insulator (refer to Instrument Panel Insulator Panel Replacement found in SI) so it can be moved aside enough to see the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > Customer Interest for Horn Switch: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 1531 steering column. 10. Depress the horn contacts in the steering wheel. Does the horn work? ^ Yes - Check if the operation of the horn is sensitive to pressure applied to the steering wheel as if a driver were doing a panic stop. In some cases, pressure applied to the steering wheel in different directions will expose a bad ground path in the steering column. Proceed to step 11. ^ No - proceed with step 11. 11. Inspect the steering column through the insulator panel location. Note: The shaft from the steering wheel comes through a metal bracket. That bracket is surrounded by plastic, which is inside of another metal bracket. Look for a small metal clip (refer to the "horn clip" graphic) that connects the inner bracket (inside the plastic) and the outer bracket. This clip provides an auxiliary ground path which is needed in some cases, if the primary path has a bad connection. 12. To verify this, connect a test light between the red wire on the horn contacts in the steering wheel and the steering column sections (1) and (2) in the illustration. Does the horn work when grounded to (1) and not (2)? ^ Yes - add or replace the horn clip. ^ No - refer to the Horn Inoperative section in SI to diagnose which component in the circuit is causing the horn inoperative condition. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Horn Switch: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad Horn Switch: All Technical Service Bulletins Horn - Inoperative When Pressing Horn Pad TECHNICAL Bulletin No.: 07-08-54-001C Date: October 17, 2008 Subject: EI07279 - Horn Inoperative from Steering Wheel Horn Pad (Ground Path Repair Procedure) Models: 2006-2007 Buick Rainier 2006 Chevrolet TrailBlazer EXT 2006-2009 Chevrolet TrailBlazer 2006 GMC Envoy XL, Envoy XUV 2006-2009 GMC Envoy, Envoy Denali Supercede: This bulletin is being revised to provide field fix information. Please discard Corporate Bulletin Number 07-08-54-001B (Section 08 - Body and Accessories). Condition Important: If the horn does NOT work from the key fob horn button, disregard this bulletin and proceed with diagnosis/repair according to SI. Some customers may comment that the horn is inoperative from the horn pad on the steering wheel. Cause The general cause of this condition is high resistance in the ground path through the steering column that energizes the horn relay. The key fob panic button uses a different ground path and is not affected. A number of locations in the circuit have been identified as sources of the high resistance. It is often difficult to pinpoint the specific location of the high resistance because the condition is usually intermittent. Attempting to discover the location can be frustrating because as circuit components are moved, the condition will often disappear. A few locations have been identified as frequent contributors to the problem. Correction Complete the following steps to diagnose and repair this condition: 1. Does the horn work by depressing the button(s) on the key fob? ^ Yes - proceed with step 2. ^ No - do not proceed with this bulletin. Diagnose and repair using information found in SI. 2. To aid in the diagnosis and to avoid disturbing others, disconnect the wiring harness from the horn assembly and insert appropriate connectors to monitor the voltage with a multi-meter or a test light. If the horn pad is currently working, rotate the steering wheel lock to lock while depressing the horn pad to determine if there are any spots in the rotation where the horn pad quits working. Caution: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling. Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Horn Switch: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 1537 repairs. 3. Remove the Inflatable Restraint Steering Wheel Module using the procedure found in Service Information. Remove the horn contacts from the steering wheel. Clean the brass contact on the end of the red wires with an abrasive pad. If possible, remove any contamination present on the mating contact on the cancel cam (inside the black tube). Also clean the four copper rivets embedded in the steering wheel frame. Apply GM Dielectric Lubricant to all the contacts to protect against reoccurrence of the corrosion. Refer to the graphic. 4. Reinstall the horn contacts and the Inflatable Restraint Steering Wheel Module and test for proper operation of the horn pad. Test for proper operation of the horn pad through the entire steering wheel rotation. Does the horn pad work properly? ^ Yes - repair is complete. ^ No - proceed with step 5. 5. Is the inoperative condition only present at certain steering wheel positions? ^ Yes - proceed with step 6. ^ No - proceed with step 9. 6. Remove the steering column trim covers. Position the steering wheel on a dead spot. Ground a test light to the steering column frame close to the steering wheel. Probe the surface of the turn signal cancel cam with the test light. Does grounding the cam activate the horn? ^ Yes - this may mean that the contact of the cancel cam that mates to the horn contact wiring harness contact, may not be clean enough or that the cancel cam may need to be replaced. Repair as necessary. Procedure complete. ^ No - proceed with step 7.Turn Signal Cancel Cam: 7. Disconnect the wiring harness that goes to the top of the multi-function switch (connector X1). Using the grounded test light, touch the harness connection for pin G. Does grounding the pin activate the horn? ^ Yes - proceed with step 8. ^ No - try grounding the test light on a known good ground. If this activates the horn, proceed to step 9. If not, investigate a possible condition with the wiring harness or BCM with appropriate SI documents. 8. The condition lies either in the multi-function switch or the interface between the multi-function switch and the cancel cam. In some cases, removing the multi-function switch and clearing the horn contact that mates with the cancel cam (refer to the graphic) of debris and reinstalling the switch will eliminate the condition. In other cases, the cancel cam may be losing contact with the multi-function switch contact. If distortion in the cancel cam is present, it may be necessary to replace the cancel cam. Repair as necessary. Procedure complete. 9. Remove the left side IP insulator (refer to Instrument Panel Insulator Panel Replacement found in SI) so it can be moved aside enough to see the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Horn Switch: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 1538 steering column. 10. Depress the horn contacts in the steering wheel. Does the horn work? ^ Yes - Check if the operation of the horn is sensitive to pressure applied to the steering wheel as if a driver were doing a panic stop. In some cases, pressure applied to the steering wheel in different directions will expose a bad ground path in the steering column. Proceed to step 11. ^ No - proceed with step 11. 11. Inspect the steering column through the insulator panel location. Note: The shaft from the steering wheel comes through a metal bracket. That bracket is surrounded by plastic, which is inside of another metal bracket. Look for a small metal clip (refer to the "horn clip" graphic) that connects the inner bracket (inside the plastic) and the outer bracket. This clip provides an auxiliary ground path which is needed in some cases, if the primary path has a bad connection. 12. To verify this, connect a test light between the red wire on the horn contacts in the steering wheel and the steering column sections (1) and (2) in the illustration. Does the horn work when grounded to (1) and not (2)? ^ Yes - add or replace the horn clip. ^ No - refer to the Horn Inoperative section in SI to diagnose which component in the circuit is causing the horn inoperative condition. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > Page 1539 Steering Wheel And Column Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > Page 1540 Horn Switch: Service and Repair Horn Switch Replacement Removal Procedure 1. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to Servicing the SIR System Caution in Service Precautions. 2. Remove the Inflatable Restraint Steering Wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in Restraint Systems. 3. Remove the horn plunger from the steering column by pressing inward to the stop and by rotating the plunger 90 degrees. 4. Disconnect the screws (1,4) from the steering wheel (3). 5. Remove the horn switch (2) from the steering wheel (3). Installation Procedure 1. Install the horn switch (2) to the steering wheel (3). 2. Connect the screws (1,4) that secure the contact plate to the steering wheel (3). Tighten the screws to 5.5 Nm (49 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Horn Switch > Component Information > Technical Service Bulletins > Page 1541 3. Install the horn plunger to the steering column. 4. Install the inflator module. Refer to Inflatable Restraint Steering Wheel Module Replacement in Restraint Systems. 5. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Turn Signal Switch > Component Information > Locations Steering Wheel And Column Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Turn Signal Switch > Component Information > Locations > Page 1545 Turn Signal Switch: Diagrams Turn Signal/Multifunction Switch C1 Turn Signal/Multifunction Switch C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Turn Signal Switch > Component Information > Locations > Page 1546 Turn Signal/Multifunction Switch C3 Turn Signal/Multifunction Switch C4 (With RPO Code K34) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Turn Signal Switch > Component Information > Service and Repair > Multifunction Turn Signal Switch Housing Replacement Turn Signal Switch: Service and Repair Multifunction Turn Signal Switch Housing Replacement Multifunction Turn Signal Switch Housing Replacement Removal Procedure 1. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 2. Remove the steering wheel from the column. 3. Remove the ignition lock cylinder case assembly. 4. Remove the turn signal and multifunction switch assembly. 5. Slide the turn signal switch housing off of the steering column shaft assembly. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Turn Signal Switch > Component Information > Service and Repair > Multifunction Turn Signal Switch Housing Replacement > Page 1549 1. Slide the turn signal switch housing onto the steering column shaft assembly. Important: The turn signal switch housing must be pressed firmly against the steering column tilt head in order for the screws from the turn signal and multifunction switch assembly screws to line up. 2. Install the turn signal and multifunction switch assembly. 3. Install the ignition lock cylinder case. 4. Install the steering wheel onto the column. 5. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Lighting and Horns > Turn Signal Switch > Component Information > Service and Repair > Multifunction Turn Signal Switch Housing Replacement > Page 1550 Turn Signal Switch: Service and Repair Multifunction, Turn Signal Switch Replacement Multifunction, Turn Signal Switch Replacement Removal Procedure 1. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 2. Remove the upper and lower trim covers. 3. Tilt the column to the CENTER position. 4. Disconnect the connectors from the turn signal and multifunction switch assembly. 5. Remove the turn signal and multifunction switch assembly. 6. Remove 2 pan head tapping screws from the turn signal and multifunction switch assembly. Installation Procedure 1. Install the turn signal and multifunction switch assembly. Important: The electrical contact on the turn signal and multifunction switch assembly must rest on the turn signal cancel cam assembly. 2. Secure by using 2 pan head tapping screws. ^ Tighten the screw on the top of the column to 3 Nm (27 inch lbs.). ^ Tighten the screw on the side to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 3. Connect the connectors to the turn signal and multifunction switch assembly. 4. Install the upper and lower trim covers. 5. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 1556 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 1557 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 1558 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 1559 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1565 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1566 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1567 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1568 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1569 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1570 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1571 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1572 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1573 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1574 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1575 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1576 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1577 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1578 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1579 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1580 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1581 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1582 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1583 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1584 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1585 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1586 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1587 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1588 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1589 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1590 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1591 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1592 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1593 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1594 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1595 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1596 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1597 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1598 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1599 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1600 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1601 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1602 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1603 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1604 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1605 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1606 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1607 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1608 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1609 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1610 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1611 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1612 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1613 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1614 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1615 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1616 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1617 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1618 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1619 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1620 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1621 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1622 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1623 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1624 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1625 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1626 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1627 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1628 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1629 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1630 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1631 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1632 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1633 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1634 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1635 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1636 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1637 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1638 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 1639 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 1640 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 1641 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1647 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1648 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1649 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1650 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1651 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1652 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1653 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1654 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1655 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1656 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1657 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1658 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1659 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1660 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1661 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1662 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1663 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1664 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1665 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1666 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1667 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1668 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1669 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1670 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1671 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1672 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1673 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1674 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1675 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1676 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1677 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1678 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1679 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1680 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1681 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1682 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1683 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1684 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1685 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1686 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1687 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1688 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1689 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1690 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1691 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1692 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1693 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1694 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1695 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1696 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1697 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1698 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1699 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1700 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1701 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1702 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1703 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1704 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1705 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1706 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1707 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1708 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1709 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1710 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1711 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1712 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1713 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1714 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1715 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1716 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1717 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1718 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1719 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1720 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 1721 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 1722 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 1723 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1732 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1733 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1734 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1735 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1741 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1742 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1743 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 1744 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 1745 Engine Coolant Temperature (ECT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 1746 Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Turn OFF the ignition. NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 4. Lower the vehicle. 5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1). 6. Remove the ECT sensor. INSTALLATION PROCEDURE 1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. - Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 1747 2. Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the sensor to 20 N.m (15 lb ft). 3. Connect the ECT sensor electrical connector (1). 4. Refill the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1753 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1754 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1755 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1756 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1757 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1758 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1759 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1760 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1761 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1762 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1763 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1764 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1765 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1766 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1767 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1768 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1769 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1770 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1771 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1772 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1773 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1774 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1775 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1776 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1777 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1778 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1779 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1780 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1781 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1782 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1783 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1784 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1785 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1786 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1787 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1788 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1789 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1790 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1791 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1792 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1793 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1794 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1795 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1796 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1797 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1798 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1799 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1800 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1801 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1802 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1803 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1804 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1805 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1806 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1807 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1808 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1809 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1810 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1811 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1812 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1813 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1814 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1815 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1816 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1817 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1818 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1819 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1820 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1821 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1822 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1823 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1824 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1825 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1826 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Page 1827 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 1830 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 1831 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams Fuel Pump And Sender Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams > Page 1835 Fuel Level Sensor: Description and Operation FUEL LEVEL SENSOR The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor cord. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor, which changes resistance in correspondence to the amount of fuel in the fuel tank. The engine control module (ECM) sends the fuel level information via the class 2 circuit to the instrument panel cluster (IPC). This information is used for the instrument panel (I/P) fuel gage and the low fuel warning indicator, if applicable. The ECM also monitors the fuel level input for various diagnostics. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement Fuel Level Sensor: Service and Repair Fuel Sender Assembly Replacement FUEL SENDER ASSEMBLY REPLACEMENT TOOLS REQUIRED J 45722 Fuel Tank Sending Unit Wrench REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Remove the fuel feed (1) and EVAP (2) lines from the fuel sender assembly. 3. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. Turn the fuel sender lock ring in a counterclockwise direction. NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring. - Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints. IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 1838 4. Remove the fuel sender assembly (2) and seal (3). Discard the seal. 5. Clean the fuel sender sealing surfaces (4). CAUTION: Refer to Fuel Storage Caution. 6. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. IMPORTANT: Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped. - Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring. - Check the lock ring for flatness. 7. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement. 8. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 1839 1. Install a NEW seal (3) onto the fuel tank. IMPORTANT: Never reuse the old seal or a fuel leak may occur. Always use a NEW seal. 2. Install the fuel sender assembly (2). IMPORTANT: Place the fuel pump strainer in a horizontal position when you install the fuel sender in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm. 3. Use the J 45722 in order to install the fuel sender lock ring. Turn the fuel sender lock ring in a clockwise direction. IMPORTANT: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. Do not apply any type of lubrication in the seal groove. Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 1840 4. Install the fuel feed (1) and EVAP (2) lines to the sender assembly. 5. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 1841 Fuel Level Sensor: Service and Repair Fuel Level Sensor Replacement FUEL LEVEL SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel sender assembly. 2. Disconnect the fuel level sensor electrical connector (1). 3. Depress the fuel level sensor retaining tabs (2) to release the sensor from the sender assembly. 4. Remove the fuel level sensor electrical connector (1) and sensor (2) from the fuel sender assembly. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 1842 1. Install the fuel level sensor (2) and electrical connector (1) to the fuel sender assembly. 2. Connect the fuel level sensor electrical connector (1). 3. Ensure the fuel level sensor retaining tabs (2) are fully engaged. 4. Install the fuel sender assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations Fuel Tank Pressure Sensor: Locations Fuel Tank (Short Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 1846 Fuel Tank (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 1847 Fuel Tank Pressure (FTP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 1848 Fuel Tank Pressure Sensor: Description and Operation FUEL TANK PRESSURE SENSOR The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 1849 Fuel Tank Pressure Sensor: Service and Repair FUEL TANK PRESSURE SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Disconnect the fuel tank pressure sensor electrical connector. 3. Remove the fuel tank pressure sensor. INSTALLATION PROCEDURE 1. Install the fuel tank pressure sensor. 2. Connect the fuel tank pressure sensor electrical connector. 3. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 1853 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 1854 Intake Air Temperature Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 1855 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 1856 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Locations > Page 1860 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1863 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1864 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1865 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1866 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1867 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1868 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1869 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1870 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1871 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1872 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1873 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1874 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1875 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1876 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1877 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1878 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1879 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1880 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1881 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1882 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1883 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1884 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1885 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1886 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1887 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1888 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1889 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1890 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1891 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1892 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1893 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1894 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1895 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1896 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1897 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1898 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1899 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1900 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1901 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1902 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1903 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1904 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1905 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1906 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1907 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1908 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1909 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1910 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1911 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1912 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1913 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1914 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1915 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1916 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1917 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1918 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1919 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1920 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1921 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1922 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1923 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1924 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1925 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1926 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1927 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1928 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1929 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1930 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1931 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1932 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1933 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1934 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1935 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1936 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Page 1937 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 1940 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations Upper Left Side Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 1944 Manifold Absolute Pressure (MAP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 1945 Manifold Pressure/Vacuum Sensor: Service and Repair MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield. 2. Disconnect the manifold absolute pressure (MAP) sensor electrical connector (3). 3. Remove the MAP sensor retaining clip (2) from the intake manifold. 4. Remove the MAP sensor (1) from the intake manifold. INSTALLATION PROCEDURE IMPORTANT: Lightly coat the MAP sensor seal with clean engine oil before installing the sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 1946 1. Install the MAP sensor (1). Push the MAP sensor into the intake manifold. 2. Install the MAP sensor retainer (2) to the intake manifold. 3. Connect the MAP sensor electrical connector (3). 4. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: Customer Interest Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 1955 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: All Technical Service Bulletins Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 1961 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 1962 Oil Pressure Sensor: Service and Repair Engine Oil Pressure Sensor and/or Switch Replacement ^ Tools Required J 41712 Oil Pressure Switch Socket Removal Procedure 1. Remove the intake manifold. 2. Disconnect the oil pressure sensor electrical connector (1). 3. Using J 41712 or equivalent, remove the oil pressure sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 1963 1. Apply sealant to the threads of the oil pressure sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Notice: Refer to Fastener Notice in Service Precautions. 2. Using J 41712 or equivalent, install the oil pressure sensor. ^ Tighten the sensor to 20 Nm (15 ft. lbs.). 3. Connect the oil pressure sensor electrical connector (1). 4. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Locations Below Rear Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions Oxygen Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1969 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1970 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1971 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1972 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1973 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1974 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1975 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1976 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1977 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1978 Oxygen Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1979 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1980 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1981 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1982 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1983 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1984 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1985 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1986 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1987 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1988 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1989 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1990 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1991 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1992 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1993 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1994 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1995 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1996 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1997 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1998 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 1999 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2000 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2001 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2002 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2003 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2004 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2005 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2006 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2007 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2008 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2009 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2010 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2011 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2012 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2013 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2014 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2015 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2016 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2017 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2018 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2019 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2020 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2021 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2022 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2023 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2024 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2025 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2026 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2027 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2028 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2029 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2030 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2031 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2032 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2033 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2034 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2035 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2036 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2037 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2038 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2039 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2040 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2041 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2042 Oxygen Sensor: Connector Views Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2043 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2044 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2045 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (3). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 2048 1. Connect the HO2S electrical connector (3). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 2049 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector. 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 2050 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector. 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 2051 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (2). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 2052 1. Connect the HO2S electrical connector (2). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 2053 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector (1). 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 2054 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector (1). 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2059 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2060 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2061 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2062 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2063 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2064 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2065 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2066 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2067 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2068 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2069 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2070 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2071 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2072 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2073 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2074 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2075 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2076 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2077 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2078 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2079 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2080 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2081 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2082 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2083 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2084 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2085 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2086 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2087 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2088 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2089 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2090 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2091 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2092 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2093 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2094 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2095 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2096 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2097 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2098 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2099 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2100 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2101 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2102 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2103 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2104 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2105 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2106 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2107 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2108 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2109 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2110 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2111 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2112 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2113 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2114 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2115 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2116 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2117 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2118 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2119 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2120 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2121 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2122 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2123 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2124 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2125 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2126 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2127 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2128 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2129 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2130 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2131 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2135 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2136 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2137 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2138 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams Vehicle Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Vehicle Speed Sensor Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams > Page 2142 Vehicle Speed Sensor: Service and Repair Vehicle Speed Sensor (VSS) Replacement Removal Procedure 1. Remove the harness connector. 2. Remove the bolt (2). 3. Remove the vehicle speed sensor (1). 4. Remove the O-ring seal (3). Installation Procedure 1. Install the O-ring seal (3) on the vehicle speed sensor (1). 2. Coat the O-ring seal (3) with a thin film of transmission fluid. 3. Install the vehicle speed sensor (1) into the transmission case. 4. Install the bolt (2). Tighten the bolt to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 5. Connect the wiring harness electrical connector to the vehicle speed sensor. 6. Refill the fluid as required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 2147 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 2148 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 2149 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 2150 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2156 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2157 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2158 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2159 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2160 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2161 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2162 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2163 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2164 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2165 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2166 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2167 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2168 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2169 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2170 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2171 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2172 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2173 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2174 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2175 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2176 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2177 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2178 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2179 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2180 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2181 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2182 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2183 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2184 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2185 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2186 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2187 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2188 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2189 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2190 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2191 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2192 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2193 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2194 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2195 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2196 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2197 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2198 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2199 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2200 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2201 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2202 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2203 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2204 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2205 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2206 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2207 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2208 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2209 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2210 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2211 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2212 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2213 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2214 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2215 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2216 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2217 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2218 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2219 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2220 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2221 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2222 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2223 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2224 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2225 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2226 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2227 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2228 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2229 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 2230 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 2231 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 2232 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2237 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2238 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2239 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2240 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2241 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2242 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2243 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2244 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2245 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2246 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2247 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2248 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2249 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2250 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2251 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2252 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2253 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2254 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2255 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2256 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2257 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2258 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2259 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2260 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2261 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2262 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2263 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2264 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2265 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2266 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2267 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2268 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2269 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2270 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2271 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2272 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2273 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2274 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2275 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2276 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2277 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2278 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2279 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2280 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2281 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2282 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2283 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2284 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2285 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2286 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2287 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2288 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2289 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2290 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2291 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2292 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2293 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2294 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2295 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2296 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2297 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2298 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2299 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2300 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2301 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2302 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2303 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2304 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2305 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2306 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2307 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2308 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2309 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2316 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2317 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2318 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2319 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2320 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2321 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2322 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2323 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2324 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2325 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2326 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2327 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2328 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2329 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2330 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2331 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2333 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2334 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2335 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2336 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2337 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2338 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2339 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2340 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2341 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2342 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2343 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2344 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2345 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2346 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2347 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2348 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2349 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2350 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2351 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2352 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2353 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2354 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2355 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2356 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2357 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2358 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2359 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2360 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2361 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2362 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2363 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2364 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2365 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2366 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2367 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2368 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2369 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2370 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2371 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2372 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2373 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2374 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2375 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2376 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2377 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2378 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2379 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2380 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2381 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2382 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2383 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2384 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2385 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2386 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2387 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2388 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2389 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 2390 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 2391 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 2392 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2398 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2399 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2400 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2401 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2402 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2403 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2404 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2405 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2406 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2407 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2408 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2409 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2410 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2411 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2412 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2413 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2414 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2415 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2416 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2417 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2418 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2419 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2420 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2421 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2422 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2423 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2424 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2425 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2426 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2427 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2428 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2429 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2430 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2431 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2432 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2433 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2434 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2435 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2436 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2437 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2438 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2439 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2440 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2441 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2442 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2443 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2444 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2445 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2446 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2447 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2448 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2449 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2450 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2451 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2452 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2453 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2454 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2455 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2456 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2457 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2458 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2459 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2460 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2461 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2462 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2463 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2464 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2465 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2466 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2467 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2468 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2469 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2470 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2471 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Page 2472 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 2475 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 2476 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: Customer Interest A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 2486 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: All Technical Service Bulletins A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 2492 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Page 2493 Ignition Switch Lock Cylinder: Description and Operation KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding Ignition Switch Lock Cylinder: Service and Repair Key and Lock Cylinder Coding KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 2496 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Replacement Ignition Lock Cylinder Replacement Removal Procedure 1. Disconnect the negative battery cable. 2. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 3. Lower the hush and knee bolster. 4. Remove the steering column trim covers. 5. With the key installed, turn the key to the RUN position. 6. Install an allen wrench into the hole on top of the lock cylinder housing. Push down on the allen wrench to release the tab on the lock cylinder inside the lock cylinder housing. 7. Slide the lock cylinder out of the lock cylinder housing. Installation Procedure 1. Install the key into the lock cylinder. 2. Use a screwdriver to rotate the lock cylinder housing gear clockwise to the start position allowing it to spring return into the RUN position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 2497 Important: The gears between the ignition switch and the lock cylinder housing must be in the correct position. Failure to do so will cause a misalignment of the gears in the ignition switch and the lock cylinder housing, which may result in a NO START or BATTERY DRAIN. 3. Align the lock cylinder and install into the lock cylinder housing. 4. Install the steering column trim covers. 5. Install the hush and knee bolster. 6. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. 7. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 2498 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Case Replacement Ignition Lock Cylinder Case Replacement Removal Procedure 1. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 2. Remove the ignition switch. 3. Remove the turn signal cancel cam. 4. Remove the park lock cable from the lock cylinder housing. 5. Remove 3 TORX(R) screws. 6. Remove the lock cylinder housing from the steering column. Installation Procedure 1. Install 3 TORX(R) screws into the lock cylinder housing. Tighten the TORX(R) screws to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 2. Install the turn signal cancel cam. 3. Install the park lock cable into the lock cylinder housing. 4. Install the ignition switch. 5. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Locations > Page 2502 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2505 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2506 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2507 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2508 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2509 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2510 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2511 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2512 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2513 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2514 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2515 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2516 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2517 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2518 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2519 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2520 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2521 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2522 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2523 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2524 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2525 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2526 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2527 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2528 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2529 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2530 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2531 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2532 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2533 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2534 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2535 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2536 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2537 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2538 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2539 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2540 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2541 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2542 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2543 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2544 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2545 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2546 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2547 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2548 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2549 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2550 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2551 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2552 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2553 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2554 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2555 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2556 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2557 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2558 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2559 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2560 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2561 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2562 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2563 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2564 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2565 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2566 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2567 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2568 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2569 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2570 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2571 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2572 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2573 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2574 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2575 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2576 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2577 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2578 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Page 2579 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 2582 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Locations Impact Sensor: Locations Electronic Frontal Sensors Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Locations > Page 2587 Beneath Passenger Seat Cushion Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Locations > Page 2588 Inflatable Restraint Side Impact Sensor (SIS) - Left Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Locations > Page 2589 Inflatable Restraint Side Impact Sensor (SIS) - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Locations > Page 2590 Rollover Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions Impact Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2593 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2594 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2595 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2596 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2597 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2598 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2599 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2600 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2601 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2602 Impact Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2603 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2604 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2605 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2606 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2607 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2608 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2609 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2610 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2611 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2612 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2613 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2614 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2615 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2616 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2617 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2618 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2619 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2620 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2621 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2622 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2623 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2624 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2625 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2626 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2627 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2628 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2629 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2630 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2631 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2632 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2633 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2634 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2635 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2636 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2637 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2638 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2639 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2640 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2641 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2642 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2643 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2644 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2645 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2646 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2647 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2648 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2649 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2650 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2651 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2652 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2653 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2654 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2655 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2656 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2657 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2658 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2659 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2660 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2661 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2662 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2663 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2664 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2665 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2666 Impact Sensor: Connector Views Electronic Frontal Sensor (EFS) - Left Electronic Frontal Sensor (EFS) - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2667 Inflatable Restraint Side Impact Sensor (SIS) - Left (With RPO Code ASF) Inflatable Restraint Side Impact Sensor (SIS) - Right (With RPO Code ASF) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2668 Rollover Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 2669 Inflatable Restraint Passenger Seat Belt Tension Retractor Sensor Inflatable Restraint Passenger Presence System (PPS) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Description and Operation > Passenger Seat Belt Tension Sensor Impact Sensor: Description and Operation Passenger Seat Belt Tension Sensor INFLATABLE RESTRAINT PASSENGER SEAT BELT TENSION SENSOR The seat belt tension sensor is used to enhance the Passenger Presence System (PPS) when an infant car seat is properly restrained on the front outboard passenger seat. The seat belt tension sensor is a 3-wire potentiometer mounted on the lower seat belt anchor and provides an input to the PPS module. When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured through the infant car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the PPS module. The PPS module uses the voltage signal to help determine if a tightly belted infant car seat is installed. The PPS uses the inputs from the seat belt tension sensor and the PPS pressure sensor to determine if the instrument panel (I/P) module should be suppressed or enabled. The PPS monitors the seat belt tension sensor circuits and sets DTC 023 if a fault is detected. To determine what DTCs have been set by the PPS, the Tech 2 is used to command the SDM to request the PPS to flash the DTCs using the PASSENGER AIR BAG ON/OFF indicators located on the rear view mirror. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Description and Operation > Passenger Seat Belt Tension Sensor > Page 2672 Impact Sensor: Description and Operation Vehicle Rollover Sensor INFLATABLE RESTRAINT VEHICLE ROLLOVER SENSOR The vehicle rollover sensor is used to supplement the side Supplemental Inflatable Restraint (SIR) System. The sensing and diagnostic module (SDM) uses the input from the vehicle rollover sensor to assist in determining the severity of a vehicle rollover or near rollover condition. If the SDM determines a deployment is warranted, the SDM will cause current to flow through the deployment loops deploying the inflatable restraint roof rail modules. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Description and Operation > Passenger Seat Belt Tension Sensor > Page 2673 Impact Sensor: Description and Operation Front End Sensors INFLATABLE RESTRAINT FRONT END SENSORS The front end sensors are equipped on vehicles to supplement the Supplemental Inflatable Restraint (SIR) System performance. The front end sensors are electronic and are not part of the deployment loops, but instead provide inputs to the sensing and diagnostic module (SDM). The front end sensors can assist in determining the severity of some frontal collisions. The SDM uses the input from the front end sensors to assist in determining the severity of a frontal collision further supporting air bag deployment. If the SDM determines a deployment is warranted, the SDM will cause current to flow through the deployment loops deploying the frontal air bags. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Service and Repair > Front Impact Sensor: Service and Repair Front INFLATABLE RESTRAINT FRONT END SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disable the SIR system. Refer to SIR Disabling and Enabling. CAUTION: Do not strike or jolt the inflatable restraint front end sensor. Before applying power to the front end sensor make sure that it is securely fastened. Failure to observe the correct installation procedure could cause SIR deployment, personal injury, or unnecessary SIR system repairs. - Refer to SIR Caution in Service Precautions. 2. Remove the grille. 3. Remove the headlamp wire harness from the retaining clip (1). 4. Raise and support the headlamp wire harness (1) to gain access to the front end sensor. 5. Loosen the bolts (1) retaining the sensor to the frame. 6. Remove the sensor assembly from the frame (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Service and Repair > Front > Page 2676 7. Position the sensor assembly above the front bumper. 8. Remove the retaining bolts and protective cover (1) from the sensor. 9. Remove the connector-position assurance (CPA) from the sensor electrical connector. 10. Disconnect the sensor (2) electrical connector. 11. Remove the sensor from the vehicle. INSTALLATION PROCEDURE 1. Remove any dirt, grease, or other impurities from the mounting surface. 2. Position the sensor assembly horizontally above the front bumper. 3. Connect the sensor (2) electrical connector. 4. Install the connector-position assurance (CPA) to the sensor electrical connector. 5. Install the retaining bolts and protective cover (1) to the sensor. 6. Position the sensor assembly horizontally to the frame (1). 7. Point the arrow on the sensor toward the front of the vehicle. 8. Install the 2 bolts (1) retaining the discriminating sensor assembly to the frame. Tighten the bolts to 8 N.m (71 lb in). NOTE: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Service and Repair > Front > Page 2677 9. Position the headlamp wire harness (1) to the retaining clip. 10. Install and secure the headlamp wire harness in the retaining clip (1). 11. Install the grille. 12. Enable the SIR system. Refer to SIR Disabling and Enabling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Service and Repair > Front > Page 2678 Impact Sensor: Service and Repair Side INFLATABLE RESTRAINT SIDE IMPACT SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disable the SIR system. Refer to SIR Disabling and Enabling and SIR Disabling and Enabling. CAUTION: Do not strike or jolt the inflatable restraint side impact sensor (SIS). Before applying power to the SIS make sure that it is securely fastened. Failure to observe the correct installation procedures could cause SIR deployment, personal injury, or unnecessary SIR system repairs. - Refer to SIR Caution in Service Precautions. 2. Remove the front door trim panel. 3. Peel the rear half of the water deflector away from the door in order to access the side impact sensor. 4. Remove the screws that retain the side impact sensor (2) to the door. 5. Disconnect the impact sensor electrical connector (1) from the side impact sensor. 6. Remove the side impact sensor from the door. INSTALLATION PROCEDURE 1. Remove any dirt, grease, or other impurities from the mounting surface. 2. Position the side impact sensor (2) horizontally to the door. 3. Connect the electrical connector (1) to the side impact sensor (2). 4. Install the screws which retain the side impact sensor to the door. Tighten the screws to 8 N.m (71 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 5. Fully seat the water deflector to the door. 6. Install the door trim panel. 7. Enable the SIR system. Refer to SIR Disabling and Enabling and SIR Disabling and Enabling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Impact Sensor > Component Information > Service and Repair > Front > Page 2679 Impact Sensor: Service and Repair Vehicle Rollover Sensor INFLATABLE RESTRAINT VEHICLE ROLLOVER SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disable the SIR system. Refer to SIR Disabling and Enabling. CAUTION: Refer to SIR Caution. 2. Fold back the rear carpet in order to gain access to the sensor. Refer to Carpet Replacement Rear (TrailBlazer, Envoy, Rainier) Carpet Replacement - Rear (TrailBlazer EXT, Envoy XL) in Interior Trim. 3. Disconnect the electrical connector. 4. Remove the nuts securing the rollover sensor to the floor panel. INSTALLATION PROCEDURE 1. Install the nuts securing the rollover sensor to the floor panel. Tighten the screws to 10 N.m (88 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 2. Connect the electrical connectors. 3. Install the rear carpet. 4. Enable the SIR system. Refer to SIR Disabling and Enabling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Belt Buckle Switch > Component Information > Locations Seat Belt Buckle Switch: Locations Seat Belt Buckle - Driver Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Belt Buckle Switch > Component Information > Locations > Page 2683 Seat Belt Buckle - Passenger Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Belt Buckle Switch > Component Information > Locations > Page 2684 Seat Belt Buckle Switch: Diagrams Seat Belt Switch - Driver Seat Belt Switch - Passenger Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Occupant Sensor > Component Information > Technical Service Bulletins > Restraints - Passenger Presence System Information Seat Occupant Sensor: Technical Service Bulletins Restraints - Passenger Presence System Information INFORMATION Bulletin No.: 06-08-50-009F Date: December 23, 2010 Subject: Information on Passenger Presence Sensing System (PPS or PSS) Concerns With Custom Upholstery, Accessory Seat Heaters or Other Comfort Enhancing Devices Models: 2011 and Prior GM Passenger Cars and Trucks Equipped with Passenger Presence Sensing System Supercede: This bulletin is being revised to update the model years. Please discard Corporate Bulletin Number 06-08-50-009E (Section 08 - Body and Accessories). Concerns About Safety and Alterations to the Front Passenger Seat Important ON A GM VEHICLE EQUIPPED WITH A PASSENGER SENSING SYSTEM, USE THE SEAT COVERS AND OTHER SEAT-RELATED EQUIPMENT AS RELEASED BY GM FOR THAT VEHICLE. DO NOT ALTER THE SEAT COVERS OR SEAT-RELATED EQUIPMENT. ANY ALTERATIONS TO SEAT COVERS OR GM ACCESSORIES DEFEATS THE INTENDED DESIGN OF THE SYSTEM. GM WILL NOT BE LIABLE FOR ANY PROBLEMS CAUSED BY USE OF SUCH IMPROPER SEAT ALTERATIONS, INCLUDING ANY WARRANTY REPAIRS INCURRED. The front passenger seat in many GM vehicles is equipped with a passenger sensing system that will turn off the right front passenger's frontal airbag under certain conditions, such as when an infant or child seat is present. In some vehicles, the passenger sensing system will also turn off the right front passenger's seat mounted side impact airbag. For the system to function properly, sensors are used in the seat to detect the presence of a properly-seated occupant. The passenger sensing system may not operate properly if the original seat trim is replaced (1) by non-GM covers, upholstery or trim, or (2) by GM covers, upholstery or trim designed for a different vehicle or (3) by GM covers, upholstery or trim that has been altered by a trim shop, or (4) if any object, such as an aftermarket seat heater or a comfort enhancing pad or device is installed under the seat fabric or between the occupant and the seat fabric. Aftermarket Seat Heaters, Custom Upholstery, and Comfort Enhancing Pads or Devices Important ON A GM VEHICLE EQUIPPED WITH A PASSENGER SENSING SYSTEM, USE ONLY SEAT COVERS AND OTHER SEAT-RELATED EQUIPMENT RELEASED AS GM ACCESSORIES FOR THAT VEHICLE. DO NOT USE ANY OTHER TYPE OF SEAT COVERS OR SEAT-RELATED EQUIPMENT, OR GM ACCESSORIES RELEASED FOR OTHER VEHICLE APPLICATIONS. GM WILL NOT BE LIABLE FOR ANY PROBLEMS CAUSED BY USE OF SUCH IMPROPER SEAT ACCESSORIES, INCLUDING ANY WARRANTY REPAIRS MADE NECESSARY BY SUCH USE. Many types of aftermarket accessories are available to customers, upfitting shops, and dealers. Some of these devices sit on top of, or are Velcro(R) strapped to the seat while others such as seat heaters are installed under the seat fabric. Additionally, seat covers made of leather or other materials may have different padding thickness installed that could prevent the Passenger Sensing System from functioning properly. Never alter the vehicle seats. Never add pads or other devices to the seat cushion, as this may interfere with the operation of the Passenger Sensing System and either prevent proper deployment of the passenger airbag or prevent proper suppression of the passenger air bag. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations Seat Sensor/Switch: Locations Under Driver Seat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2692 Under Passenger Seat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2693 Seat Sensor/Switch: Diagrams Inflatable Restraint Seat Position Sensor (SPS) - Left Inflatable Restraint Seat Position Sensor (SPS) - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2694 Seat Sensor/Switch: Description and Operation INFLATABLE RESTRAINT SEAT POSITION SENSORS (SPS) The seat position sensor (SPS) is used to determine the proximity of a front driver or passenger seat position with respect to the frontal air bag. The SPS interfaces with the sensing and diagnostic module (SDM). The state of the SPS allows the SDM to disable stage 2 of the frontal air bag for a front seat that is forward of a forward/rearward point in seat track travel. The SPS is a Hall effect sensor that is mounted on the outboard seat track of both the driver and passenger seats. The seat track includes a metal bracket that shunts the SPS magnetic circuit creating two states of seat position. The shunted state represents a rearward seat position. The non-shunted state represents a forward position. The SPS provides 2 current ranges, one range for the shunted state and a second range for a non-shunted state. These 2 states are inputs to the SDM. State 1 (shunted) being the rearward threshold and state 2 (non-shunted) being the forward threshold. When the SDM receives input from a SPS that state 1 threshold is reached (seat is rearward) the SDM will not disable stage 2 deployment, if required by the deployment sensors. When state 2 threshold is reached (seat is forward) the SDM will disable stage 2 deployment on the side the seat is forward. The SDM monitors the SPS circuit and if a fault is detected the SDM will set codes B0083 or B0084 and defaults to disabling stage 2 frontal deployment. This will only default on the side of the vehicle the sensor has a fault. Its important to understand that the SPS is secondary to the passenger presence system (PPS) in the disable mode the passenger air bag will not deploy regardless of the SPS status. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2695 Seat Sensor/Switch: Service and Repair INFLATABLE RESTRAINT SEAT POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the seat from the vehicle. 2. Unclip the front, rear, and side J-strips (1, 2) on the underside of the seat. 3. Remove the lumbar knob by pulling the knob straight away from the seat, if equipped. 4. Remove the recliner handle. 5. Remove the screws (2) that retain the lumbar adjustment mechanism (1) to the seat adjuster. 6. Remove the lumbar cable from the lumbar adjustment mechanism. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2696 7. Remove the 2 bolts (1) securing the seat recliner to the seat adjuster. 8. Remove the seat back assembly from the seat cushion assembly. 9. Disconnect the seat belt buckle electrical connector (1). 10. Disconnect the wiring harness (2) from the seat position switch. 11. Remove the bolt (2) securing the seat belt buckle assembly (1) to the seat adjuster. 12. Remove the seat cushion cover and foam. 13. Remove the assist spring. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2697 14. Remove the 4 nuts (1) securing the seat cushion frame to the seat adjusters. 15. Remove the seat adjusters. 16. Remove the 2 nuts (1) securing the seat position switch (3) to the seat adjuster (2). 17. Drill out the rivets securing the sensor to the bracket. INSTALLATION PROCEDURE 1. Install new rivets securing the sensor to the bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2698 2. Install the seat position switch (3) to the seat adjuster (2) with 2 nuts (1). Tighten the seat position switch nuts to 24 N.m (18 lb ft). NOTE: Refer to Fastener Notice in Service Precautions. 3. Install the seat adjusters to the seat cushion frame with 4 nuts (1). Tighten the seat cushion frame mounting nuts to 24 N.m (18 lb ft). 4. Install the assist spring. 5. Install the seat cushion foam pad and cover to the frame. 6. Install the seat belt buckle assembly (1) through the seat cushion pad. 7. Install the seat belt buckle assembly (1) to the seat adjuster with the bolt (2). Tighten the seat belt buckle bolt to 55 N.m (41 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2699 8. Connect the seat belt buckle electrical connector (1). 9. Connect the wiring harness (2) to the seat position switch. 10. Position the seat back assembly on the seat cushion assembly. 11. Install the 2 bolts (1) securing the seat recliner to the seat adjuster. 12. Install the lumbar adjustment mechanism (1) to the seat adjuster with the 2 screws (2). 13. Install the lumbar cable to the lumbar adjustment mechanism. 14. Install the lumbar knob by pushing the knob straight onto the shaft, if equipped. 15. Install the recliner handle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Restraint Systems > Seat Sensor/Switch > Component Information > Locations > Page 2700 16. Install the front, rear, and side J-strips (1, 2) to the underside of the seat. 17. Install the seat in the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: Customer Interest A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 2711 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: All Technical Service Bulletins A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 2717 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Page 2718 Ignition Switch Lock Cylinder: Description and Operation KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding Ignition Switch Lock Cylinder: Service and Repair Key and Lock Cylinder Coding KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 2721 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Replacement Ignition Lock Cylinder Replacement Removal Procedure 1. Disconnect the negative battery cable. 2. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 3. Lower the hush and knee bolster. 4. Remove the steering column trim covers. 5. With the key installed, turn the key to the RUN position. 6. Install an allen wrench into the hole on top of the lock cylinder housing. Push down on the allen wrench to release the tab on the lock cylinder inside the lock cylinder housing. 7. Slide the lock cylinder out of the lock cylinder housing. Installation Procedure 1. Install the key into the lock cylinder. 2. Use a screwdriver to rotate the lock cylinder housing gear clockwise to the start position allowing it to spring return into the RUN position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 2722 Important: The gears between the ignition switch and the lock cylinder housing must be in the correct position. Failure to do so will cause a misalignment of the gears in the ignition switch and the lock cylinder housing, which may result in a NO START or BATTERY DRAIN. 3. Align the lock cylinder and install into the lock cylinder housing. 4. Install the steering column trim covers. 5. Install the hush and knee bolster. 6. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. 7. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Starting and Charging > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 2723 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Case Replacement Ignition Lock Cylinder Case Replacement Removal Procedure 1. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 2. Remove the ignition switch. 3. Remove the turn signal cancel cam. 4. Remove the park lock cable from the lock cylinder housing. 5. Remove 3 TORX(R) screws. 6. Remove the lock cylinder housing from the steering column. Installation Procedure 1. Install 3 TORX(R) screws into the lock cylinder housing. Tighten the TORX(R) screws to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 2. Install the turn signal cancel cam. 3. Install the park lock cable into the lock cylinder housing. 4. Install the ignition switch. 5. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Steering > Steering Angle Sensor > Component Information > Service and Repair Steering Angle Sensor: Service and Repair Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement Removal Procedure 1. Disable the SIR system. Caution: Refer to SIR Caution. 2. Position the front wheels straight ahead and lock the steering column to prevent rotation of the steering wheel. Notice: The wheels of the vehicle must be straight ahead and the steering column in the LOCK position before disconnecting the steering column or intermediate shaft from the steering gear. Failure to do so will cause the SIR coil assembly to become uncentered, which may cause damage to the coil assembly. 3. Remove the intermediate shaft from the steering column. 4. Remove the steering wheel position sensor retainer screws (1). 5. Remove the steering wheel position sensor retainer (2) from the base of the steering column. 6. Disconnect the electrical connector from the steering wheel position sensor. 7. Remove the steering wheel position sensor (3) from the steering column. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Steering > Steering Angle Sensor > Component Information > Service and Repair > Page 2729 1. Position the steering wheel sensor (3) to the steering column. 2. Position the steering wheel sensor retainer plate (2) to the steering column. 3. Install the steering wheel position sensor retainer screws (1). Tighten the screws to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Remove the steering wheel position sensor anti rotation pin from the sensor. 5. Connect the electrical connector to the steering wheel position sensor. 6. Install the intermediate shaft to the steering column. 7. Enable the SIR system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Ride Height Sensor, Suspension Control > Component Information > Locations Ride Height Sensor: Locations Suspension Controls Component Views Rear Frame and Underbody - Short Wheelbase (SWB) 1 - Air Suspension Sensor - LR 2 - Air Suspension Sensor - RR 3 - Air Suspension Compressor Assembly 4 - Air Suspension Inflator Switch 5 - Frame Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Ride Height Sensor, Suspension Control > Component Information > Locations > Page 2734 Rear Frame and Underbody - Long Wheelbase (LWB) 1 - Air Suspension Compressor Assembly 2 - Air Suspension Inflator Switch 3 - Air Suspension Sensor - LR 4 - Air Suspension Sensor - RR 5 - Frame Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Ride Height Sensor, Suspension Control > Component Information > Locations > Page 2735 Ride Height Sensor: Diagrams Component Locator Air Suspension Sensor - LR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Ride Height Sensor, Suspension Control > Component Information > Locations > Page 2736 Air Suspension Sensor - RR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Ride Height Sensor, Suspension Control > Component Information > Locations > Page 2737 Ride Height Sensor: Service and Repair Air Spring Leveling Sensor Replacement Removal Procedure 1. Remove the air suspension system fuse. Important: Remove the air suspension system fuse before working on the rear suspension components or the rear axle. Failure to remove the air suspension system fuse could cause the calibration of the air suspension leveling sensor to change and the air suspension system not to function properly. 2. Ensure that the vehicle is parked on level surface. 3. Inspect tires for proper tire pressure. Refer to Label - Vehicle Certification, Tire Place Card, Anti-Theft and Service Parts ID. 4. Inspect the air suspension system components for damage or defects. 5. Raise and support the vehicle. 6. Remove the rear tire and wheels. 7. Support the rear axle and set the rear axle to proper D height. Refer to Trim Height Specifications. 8. Disconnect the air spring level sensor link from the upper control arm. 9. Disconnect the air spring level sensor electrical connector. 10. Remove the air spring level sensor to the frame mounting bolts. 11. Remove the air spring level sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Ride Height Sensor, Suspension Control > Component Information > Locations > Page 2738 1. Install the air spring level sensor link to the upper control arm. 2. Install the air spring level sensor to the frame mounting bolts. Tighten the air spring level sensor to the frame mounting bolts to 8 Nm (71 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Important: Do not remove the air spring level sensor locating pin until the air spring level sensor has been properly aligned and the proper D height has been measured and maintained. Refer to Trim Height Specifications. 3. Connect the air spring level sensor electrical connector. 4. Remove the air spring level sensor locating pin. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Ride Height Sensor, Suspension Control > Component Information > Locations > Page 2739 Notice: Failure to remove the air suspension auto level control sensor locating pin before the rear axle support is removed will cause damage to the air suspension auto level control sensor. 5. Remove the rear axle support. 6. Install the rear tire and wheels. 7. Lower the vehicle. 8. Install the air suspension system fuse. 9. Start the vehicle and run for approximately 1 minute to ensure that the air spring leveling system is functioning properly. 10. Check the D height. Refer to Trim Height Inspection Procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Steering Angle Sensor > Component Information > Service and Repair Steering Angle Sensor: Service and Repair Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement Removal Procedure 1. Disable the SIR system. Caution: Refer to SIR Caution. 2. Position the front wheels straight ahead and lock the steering column to prevent rotation of the steering wheel. Notice: The wheels of the vehicle must be straight ahead and the steering column in the LOCK position before disconnecting the steering column or intermediate shaft from the steering gear. Failure to do so will cause the SIR coil assembly to become uncentered, which may cause damage to the coil assembly. 3. Remove the intermediate shaft from the steering column. 4. Remove the steering wheel position sensor retainer screws (1). 5. Remove the steering wheel position sensor retainer (2) from the base of the steering column. 6. Disconnect the electrical connector from the steering wheel position sensor. 7. Remove the steering wheel position sensor (3) from the steering column. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Steering Angle Sensor > Component Information > Service and Repair > Page 2743 1. Position the steering wheel sensor (3) to the steering column. 2. Position the steering wheel sensor retainer plate (2) to the steering column. 3. Install the steering wheel position sensor retainer screws (1). Tighten the screws to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Remove the steering wheel position sensor anti rotation pin from the sensor. 5. Connect the electrical connector to the steering wheel position sensor. 6. Install the intermediate shaft to the steering column. 7. Enable the SIR system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Suspension Mode Switch > Component Information > Locations Suspension Mode Switch: Locations Suspension Controls Component Views Rear Frame and Underbody - Short Wheelbase (SWB) 1 - Air Suspension Sensor - LR 2 - Air Suspension Sensor - RR 3 - Air Suspension Compressor Assembly 4 - Air Suspension Inflator Switch 5 - Frame Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Suspension Mode Switch > Component Information > Locations > Page 2747 Rear Frame and Underbody - Long Wheelbase (LWB) 1 - Air Suspension Compressor Assembly 2 - Air Suspension Inflator Switch 3 - Air Suspension Sensor - LR 4 - Air Suspension Sensor - RR 5 - Frame Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Suspension Mode Switch > Component Information > Locations > Page 2748 Suspension Mode Switch: Diagrams Suspension Controls Connector End Views Air Suspension Compressor Assembly C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Suspension > Suspension Mode Switch > Component Information > Locations > Page 2749 Suspension Mode Switch: Service and Repair Inflator Air Switch Replacement Removal Procedure 1. Raise and support the vehicle. 2. Disconnect the inflator air switch harness from the air compressor. 3. Lower the vehicle. 4. Remove the rear quarter lower trim panel. 5. Remove the inflator air switch from the vehicle. Installation Procedure 1. Install the inflator air switch to the vehicle. 2. Install the rear quarter lower trim panel. 3. Raise the vehicle. 4. Connect the inflator air switch harness to the air compressor. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs Tire Pressure Sensor: Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 2755 Tire Pressure Sensor: Technical Service Bulletins Tire Monitor System - TPM Sensor Information INFORMATION Bulletin No.: 08-03-16-003 Date: May 12, 2008 Subject: Warranty Reduction - Transfer of Tire Pressure Monitoring (TPM) Sensors to Replacement Wheels and Allowable TPM Sensor Replacements Models: 2000-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7x with On-Wheel TPM Sensors TPM Sensor / Wheel Warranty Reviews During the last warranty review period it was noted that wheels being returned under the GM New Vehicle Warranty were being shipped back to General Motors with the TPM sensor still attached to the wheel. Return rates ran as high as 60% with the TPM sensors still attached. Operational TPM sensors should not be returned to GM and are to be transferred to replacement wheels if they become necessary. Important: Operational TPM Sensors that are returned under warranty to General Motors will be charged back to the dealer.Sensors have a 10 year /150,000 mile (240,000 km) battery life, and should be transferred if one or more wheels are replaced. TPM Valve Stem / Grommet (0-ring) Replacement When the TPM sensors are transferred to new wheels you should replace the component used to seal the TPM sensor stem to the wheel. On sensors with an aluminum stem and visible nut on the outside of the wheel a replacement grommet (0-ring) should be used to assure a proper seal. The sensor retaining nut (except Aveo) should be tightened to 7 N.m (62 lb in) for all vehicles except Pontiac Vibe (4.0 N.m (35.4 lb in)). Important: ^ DO NOT overtorque the retaining nut. Notice: ^ Factory installed TPM Sensors come with plastic aluminum or nickel-plated brass stem caps. These caps should not be changed. Chrome plated steel caps may cause corrosion of aluminum valve stems due to incompatibility of the metals. On current style sensors the entire rubber stem is replaceable. The service interval on the revised TPM sensor with replaceable stem is the same as for any other traditional valve stem. Replace the stem at the time of tire replacement sensor transfer or whenever air seepage is suspected at the valve stem. When replacing the valve stem tighten the screw to 1.3 N.m (11.5 lb in). For either style of TPM sensor see the service parts guide for the correct GM part numbers to order and use. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 2756 Tire Pressure Sensor: Technical Service Bulletins Tires - Minimizing Damage to TPM Sensors INFORMATION Bulletin No.: 08-03-10-007 Date: May 16, 2008 Subject: Minimizing Damage to Tire Pressure Monitor (TPM) Sensors During Tire Mounting/Dismounting Models: 2009 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2009 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with Wheel Mounted Tire Pressure Sensors Minimizing Damage To TPM Sensors All GM vehicles now in production and sold in the U.S., as well as many vehicles sold in Canada, feature Tire Pressure Monitoring Systems that have valve stem mounted Tire Pressure Sensors. When dismounting and mounting tires, care must be taken when breaking the bead loose from the wheel. If the tire machines bead breaking fixture is positioned too close to the tire pressure sensor, as the tire bead breaks away from the wheel it may be forced into, or catch on the edge of the tire pressure sensor. This can damage the sensor and require the sensor to be replaced. Care must also be taken when transferring the tire bead to the other side of the wheel rim. As the tire machine rotates and the tire bead is stretched around the wheel rim, the bead can come in contact with the sensor if it is not correctly positioned in relation to the mounting/dismounting head prior to tire mounting/dismounting. This can also cause sensor damage requiring replacement. Procedure Notice: Use a tire changing machine in order to dismount tires. Do not use hand tools or tire irons alone in order to remove the tire from the wheel. Damage to the tire beads or the wheel rim could result. Notice: Do not scratch or damage the clear coating on aluminum wheels with the tire changing equipment. Scratching the clear coating could cause the aluminum wheel to corrode and the clear coating to peel from the wheel. 1. Remove the valve core from the valve stem. 2. Deflate the tire completely. Important: Rim-clamp European-type tire changers are recommended. 3. Use the tire changer in order to remove the tire from the wheel. Follow steps 4-7 to remove the tire from the wheel. 4. When separating the tire bead from the wheel position the bead breaking fixture 90, 180 and 270 degrees from the valve stem. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 2757 5. Position the wheel and tire so the valve stem is situated at the 2 o'clock position relative to the head. The tire iron or pry bar can be inserted when prying the outer tire bead up and over the mounting/dismounting head. 6. Position the wheel and tire so that the valve stem is situated again at the 2 o'clock position relative to the head. The tire iron or pry bar can be inserted when prying the inner tire bead up and over the mounting/dismounting head. 7. Remove all residual liquid sealant from the inside of the tire and wheel surfaces. If any tire sealant is noted upon tire dismounting on vehicles equipped with TPM replace the tire pressure sensor. 8. Use a wire brush or coarse steel wool in order to remove any rubber, light rust or corrosion from the wheel bead seats. Important: If bead seat corrosion has been identified as an air loss concern on the wheel being worked on, refer to GM Service Bulletin # 08-03-10-006 for additional information on correcting the leak. 9. Apply GM P/N 12345884 (in Canada, P/N 5728223) or equivalent to the tire bead and the wheel rim. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 2758 10. Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. 11. Position the rim so that the valve stem (1) is situated at the 3 o'clock position relative to the head (2). This will protect the sensor when the bottom bead seats. 12. After the bottom bead is on the wheel, reposition the wheel and tire so that the valve stem is situated at the 9 o'clock position relative to the head. This will protect the sensor while mounting the tire bead to the outside of the wheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 2759 13. Use the tire changer in order to install the tire to the wheel. Caution: To avoid serious personal injury, do not stand over tire when inflating. The bead may break when the bead snaps over the safety hump. Do not exceed 275 kPa (40 psi) pressure when inflating any tire if beads are not seated. If 275 kPa (40 psi) pressure will not seat the beads, deflate, lubricate the beads and reinflate. Overinflating may cause the bead to break and cause serious personal injury. Important: Allowable bead seating pressure is 345 kPa (50 psi) on Extended Mobility Tires. 14. Inflate the tire until it passes the bead humps. Be sure that the valve core is not installed at this time. 15. Install the valve core to the valve core stem. 16. Inflate the tire to the proper air pressure. 17. Ensure that the locating rings are visible on both sides of the tire in order to verify that the tire bead is fully seated on the wheel. Parts Information The product shown above is available from GM SPO. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement Tire Pressure Sensor: Service and Repair Tire Pressure Sensor Grommet Replacement Tire Pressure Sensor Grommet Replacement Removal Procedure 1. Raise the vehicle on a suitable support. 2. Remove the tire/wheel assembly from the vehicle. 3. Remove the tire from the wheel. Important: Before the tire is removed from the wheel, note the following items to avoid tire pressure sensor damage upon tire dismounting: ^ Place the sensors cap and valve on a dry clean surface after removal, the cap is aluminum and the valve is nickel plated to prevent corrosion and are not to be substituted with a cap or valve made of any other material. ^ Position the bead breaking fixture 90 degrees from the valve stem when separating the tire bead from the wheel. ^ Position the mounting/dismounting head so the tire iron, or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim. ^ Repeat items for inner bead. 4. Remove the tire pressure sensor nut. Important: If any tire sealant is noted upon tire dismounting, replace the sensor. Also remove all residual liquid sealant from the inside of the tire and wheel surfaces. 5. Remove the sensor from the wheel hole. 6. Remove the sensor grommet from the valve stem. Installation Procedure 1. Clean any dirt or debris from the grommet sealing areas. 2. Install the grommet on the sensor valve stem. 3. Insert the sensor in the wheel hole with the air passage facing away from the wheel. 4. Install the sensor nut and position the sensor body parallel to the inside wheel surface while torquing. Tighten the sensor nut to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 2762 5. Install the tire on the wheel. Important: Before installing the tire on the wheel, note the following items to avoid tire pressure sensor damage upon tire mounting: ^ Position the mounting/dismounting head 180 degrees from the valve stem. ^ Position the bead transition area 45 degrees counterclockwise of the valve stem. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. ^ Repeat items for outer bead. 6. Install the tire/wheel assembly on the vehicle. 7. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 2763 Tire Pressure Sensor: Service and Repair Tire Pressure Sensor Replacement Tire Pressure Sensor Replacement Removal Procedure 1. Raise the vehicle on a suitable support. 2. Remove the tire/wheel assembly from the vehicle. 3. Remove the tire from the wheel. Important: Before the tire is removed from the wheel, note the following items to avoid tire pressure sensor damage upon tire dismounting. ^ Place the sensors cap and valve on a dry clean surface after removal. The cap is aluminum and the valve is nickel plated to prevent corrosion and are not to be substituted with a cap or valve made of any other material. ^ When separating the tire bead from the wheel, position the bead breaking fixture 90 degrees from the valve stem. ^ Position the mounting/dismounting head so the tire iron, or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim. ^ Repeat items for inner bead. 4. Remove the tire pressure sensor nut. Important: If any tire sealant is noted upon tire dismounting, remove all residual liquid sealant from the inside of the tire and wheel surfaces. 5. Remove the tire pressure sensor. Installation Procedure 1. Clean any dirt or debris from the grommet sealing area. 2. Insert the sensor in the wheel hole with the air passage facing away from the wheel. 3. Install the sensor nut and position the sensor body parallel to the inside wheel surface while torquing. Tighten the sensor nut to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Install the tire on the wheel. Important: Before reinstalling the tire on the wheel, note the following items to avoid tire pressure sensor damage upon tire mounting. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Steering and Suspension > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 2764 ^ Position the mounting/dismounting head 180 degrees from the valve stem. ^ Position the bead transition area 45 degrees counterclockwise of the valve stem. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. ^ Repeat items for outer bead. 5. Install the tire/wheel assembly on the vehicle. Important: A service replacement tire pressure sensor is shipped in OFF mode. In this mode the sensor's unique identification code cannot be learned into the passenger door modules (PDMs) memory. The sensor must be taken out of OFF mode by spinning the tire/wheel assembly above 32 km/h (20 mph) in order to close the sensors internal roll switch for at least 10 seconds. 6. Lower the vehicle. 7. Learn the tire pressure sensors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications TFP Manual Valve Position Switch Logic Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2770 Fluid Pressure Sensor/Switch: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2771 Fluid Pressure Sensor/Switch: Diagrams Automatic Transmission Inline 20-Way Connector End View Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2772 Fluid Pressure Sensor/Switch: Service and Repair Valve Body and Pressure Switch Replacement Removal Procedure 1. Ensure that removal of the valve body is necessary before proceeding. ^ Important: The following components can be serviced without removing the valve body from the transmission: The torque converter clutch solenoid (1) ^ The pressure control solenoid (2) ^ The internal wiring harness (3) ^ The 2-3 shift solenoid (4) ^ The 1-2 shift solenoid (5) ^ The transmission fluid pressure manual valve position switch (6) ^ The 3-2 shift solenoid (7) ^ The torque converter clutch pulse width modulation (TCC PWM) solenoid (8) 2. Remove the fluid level indicator. 3. Raise the vehicle. 4. Remove the oil pan, gasket, and filter. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2773 6. Remove the fluid indicator stop bracket bolt (2). 7. Remove the fluid indicator bracket (1). 8. Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible. 9. Remove the TCC PWM solenoid (1) in order to access the TCC solenoid retaining bolts. 10. Remove the TCC solenoid retaining bolts. 11. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body. 12. Reposition the harness to the side of the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2774 13. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. 14. Remove the transmission fluid pressure switch. 15. Inspect the transmission fluid pressure switch for damage or debris. 16. Remove the manual detent spring retaining bolt. 17. Remove the manual detent spring. 18. Inspect the manual detent spring for cracks or damage. 19. Remove the remaining control valve body bolts. Important: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2775 20. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. Installation Procedure Ball Check Valves 1. Install the checkballs (1-7) in the valve body. 2. Install the control valve body to the transmission case while simultaneously connecting the manual valve link to the manual valve. 3. Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2). 4. Install one bolt (M6 X 1.0 X 47.5) hand tight in the center (1) of the valve body to hold it in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2776 5. Do not install the transmission fluid indicator stop bracket and bolt at this time. Install but do not tighten the control valve body bolts which retain only the valve body directly. Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following: ^ M6 X 1.0 X 65.0 (1) ^ M6 X 1.0 X 54.4 (2) ^ M6 X 1.0 X 47.5 (3) ^ M6 X 1.0 X 35.0 (4) ^ M8 X 1.0 X 20.0 (5) ^ M6 X 1.0 X 12.0 (6) ^ M6 X 1.0 X 18.0 (7) Important: When installing bolts throughout this procedure, be sure to use the correct bolt size and length in the correct location as specified. 6. Install the manual detent spring. 7. Install but do not tighten the manual detent spring retaining bolt. 8. Install the transmission fluid pressure switch. 9. Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2777 10. Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows. Tighten the control valve body bolts (in sequence) to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation. 11. Ensure that the manual detent spring is aligned properly with the detent lever. Tighten the manual detent spring bolt to 31 Nm (23 ft. lbs.). 12. Install the TCC solenoid with a new O-ring seal to the valve body. 13. Install the TCC solenoid bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2778 Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). 14. Install the internal wiring harness to the valve body. The internal wiring harness has a tab (1) on the edge of the conduit. 15. Place the tab between the valve body and the pressure switch in the location shown (2). Press the harness into position on the valve body bolt bosses (1, 3). 16. Install the TCC PWM solenoid (1) to the control valve body. 17. Install the TCC PWM solenoid retainer (2). 18. Install the transmission fluid indicator stop bracket (1) and bolt (2). Tighten the transmission fluid indicator stop bracket bolt to 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 2779 19. Connect the internal wiring harness electrical connectors to the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) 20. Install the transmission oil pan and filter. 21. Lower the vehicle. 22. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 23. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2783 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2784 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2785 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 2786 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations Transmission Speed Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 2790 Vehicle Speed Sensor (VSS) 1 - VSS Sensor 2 - Transfer Case Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 2791 Transmission Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Input Speed Sensor (ISS) Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Temperature Sensor/Switch, A/T > Component Information > Specifications Transmission Fluid Temperature (TFT) Sensor Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Diagrams > Power Window Switch Power Window Switch: Diagrams Power Window Switch Window Switch - RR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Diagrams > Power Window Switch > Page 2800 Window Switch - LR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Diagrams > Power Window Switch > Page 2801 Power Window Switch: Diagrams Quarter Glass Switch Quarter Glass Switch - Left (With RPO Code A34) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Diagrams > Power Window Switch > Page 2802 Quarter Glass Switch - Right (With RPO Code A34) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Service and Repair > Door Lock and Side Window Switch Replacement - Driver Side Power Window Switch: Service and Repair Door Lock and Side Window Switch Replacement Driver Side SWITCH REPLACEMENT - DOOR LOCK AND SIDE WINDOW - DRIVER REMOVAL PROCEDURE 1. Lift up on the front edge of the switch panel in order to release the front retaining clip. 2. Lift up on the rear edge of the switch panel in order to release the 2 rear retaining clips. 3. If equipped, disconnect the electrical connectors from the driver door module (1). 4. If replacing only the driver door module, remove the module from the door trim panel. 5. Disconnect the remaining electrical connectors from the switch panel. 6. If replacing only the switch panel, retain the driver door module for transfer. 7. Remove the switch panel assembly from the vehicle INSTALLATION PROCEDURE 1. Install the driver door module (1) to the door trim panel. 2. Connect the electrical connector to the driver door module. 3. If replacing the switch panel, connect the remaining electrical connectors. 4. If replacing the driver door module, program the driver door module. Refer to Control Module References for programming and setup information and Personalization Description and Operation . IMPORTANT: When replacing the driver door module, the set up procedure must be performed. 5. Install the switch panel to the door trim panel, ensuring the front and rear retaining clips are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Service and Repair > Door Lock and Side Window Switch Replacement - Driver Side > Page 2805 Power Window Switch: Service and Repair Door Lock and Side Window Switch Replacement Passenger Side SWITCH REPLACEMENT - DOOR LOCK AND SIDE WINDOW - PASSENGER REMOVAL PROCEDURE 1. Lift up on the front edge of the switch panel in order to release the front retaining clip. 2. Lift up on the rear edge of the switch panel in order to release the 2 rear retaining clips. 3. If equipped, disconnect the electrical connectors from the passenger door module (1). 4. If replacing only the passenger door module, remove the module from the door trim panel. 5. Disconnect the remaining electrical connectors from the switch panel. 6. If replacing only the switch panel, retain the passenger door module for transfer. 7. Remove the switch panel assembly from the vehicle. INSTALLATION PROCEDURE 1. Install the passenger door module (1) to the door trim panel. 2. Connect the electrical connector to the passenger door module. 3. If replacing the switch panel, connect the remaining electrical connectors. 4. If replacing the passenger door module, program the passenger door module. Refer to Control Module References for programming and setup information. IMPORTANT: When replacing the passenger door module, the set up procedure must be performed. 5. Install the switch panel to the door trim panel, ensuring the front and rear retaining clips are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Service and Repair > Door Lock and Side Window Switch Replacement - Driver Side > Page 2806 Power Window Switch: Service and Repair Power Quarter Window Switch Replacement POWER QUARTER WINDOW SWITCH REPLACEMENT REMOVAL PROCEDURE 1. Remove the overhead console. 2. Disconnect the electrical connector (1) from the quarter window switch. 3. Release the tabs retaining the quarter window switch to the overhead console. 4. Remove the quarter window switch from the overhead console. INSTALLATION PROCEDURE 1. Install the quarter window switch to the overhead console, ensuring the retaining tabs are fully seated. 2. Connect the electrical connector (1) to the quarter window switch. 3. Install the overhead console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Windows and Glass > Power Window Switch > Component Information > Service and Repair > Door Lock and Side Window Switch Replacement - Driver Side > Page 2807 Power Window Switch: Service and Repair Power Window Switch Replacement - Rear Door POWER WINDOW SWITCH REPLACEMENT - REAR DOOR REMOVAL PROCEDURE 1. Using a flat-bladed tool, remove the window switch bezel from the door trim panel. 2. Disconnect the electrical connector from the window switch. 3. Release the retaining clips that attach the power window switch to the bezel. 4. Remove the switch from the bezel. INSTALLATION PROCEDURE 1. Install the switch to the bezel. Ensure that the retainers are fully seated. 2. Connect the electrical connector to the window switch. 3. Install the window switch bezel to the door trim panel. 4. Ensure that the window switch bezel retaining clips are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Rain Sensor > Component Information > Locations Outside Moisture Sensor (With RPO Code CE1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Rain Sensor > Component Information > Locations > Page 2812 Outside Moisture Sensor (With RPO Code CE1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Rain Sensor > Component Information > Locations > Page 2813 Rain Sensor: Service and Repair WINDSHIELD OUTSIDE MOISTURE SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the electrical connector from the rain sensor (1). IMPORTANT: The rain sensor retaining ring is permanently mounted to the windshield and is not serviceable. Damage to the windshield or the retaining ring will occur if removed. 2. Carefully pull downward on sensor (1) to release it from the retaining ring (2). 3. Remove the sensor from the vehicle. IMPORTANT: Do not touch the surface of the sensor when it is removed from the glass. INSTALLATION PROCEDURE 1. Clean the mounting location on the windshield using a clean lint free cloth with isopropyl alcohol. 2. Install the rain sensor (1) to the windshield. 3. Connect the electrical connector to the rain sensor (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Washer Fluid Level Switch > Component Information > Locations Windshield Washer Fluid Reservoir Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Washer Fluid Level Switch > Component Information > Locations > Page 2817 Windshield Washer Fluid Level Switch (With RPO Code U68) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Washer Fluid Level Switch > Component Information > Locations > Page 2818 Washer Fluid Level Switch: Service and Repair WASHER SOLVENT CONTAINER LEVEL SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the washer solvent container. 2. Using 2 flat-bladed tools, gently pry the level sensor switch (2) from the container (1). 3. Remove the level sensor switch grommet and discard. INSTALLATION PROCEDURE 1. Install a new level sensor switch grommet into the washer solvent container (1). 2. Lubricate the grommet with washer fluid to aid in the installation of the level sensor switch. 3. Ensure the square tab (3) is positioned vertical to the washer container. 4. Push inward in order to seat the level sensor (2) into the grommet. 5. Install the washer solvent container. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Windshield Washer Switch > Component Information > Locations Windshield Washer Switch: Locations Behind The Center Of The I/P (With RPO Code X88) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Windshield Washer Switch > Component Information > Locations > Page 2822 Behind The Center Of The I/P (With RPO Code Z88/Z89) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Windshield Washer Switch > Component Information > Locations > Page 2823 Windshield Wiper/Washer Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Windshield Washer Switch > Component Information > Locations > Page 2824 Behind The Center Of The I/P (With RPO Code W49) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Windshield Washer Switch > Component Information > Locations > Page 2825 Rear Window Wiper/Washer Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Windshield Washer Switch > Component Information > Locations > Page 2826 Windshield Washer Switch: Service and Repair WIPER/WASHER SWITCH REPLACEMENT - REAR REMOVAL PROCEDURE 1. Remove the instrument panel (I/P) accessory trim plate. 2. Disconnect the electrical connector from the wiper washer switch. 3. Release the wiper washer switch locking tabs. 4. Remove the switch from the trim plate. INSTALLATION PROCEDURE 1. Position the switch to the trim plate. 2. Connect the electrical connector to the wiper washer switch. 3. Install the switch to the instrument panel trim plate, ensuring that the locking tabs are properly seated. 4. Install the I/P accessory trim plate. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Wiper Switch > Component Information > Locations Wiper Switch: Locations Behind The Center Of The I/P (With RPO Code W49) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Wiper Switch > Component Information > Locations > Page 2830 Windshield Wiper/Washer Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Wiper Switch > Component Information > Locations > Page 2831 Behind The Center Of The I/P (With RPO Code Z88/Z89) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Wiper Switch > Component Information > Locations > Page 2832 Behind The Center Of The I/P (With RPO Code X88) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Wiper Switch > Component Information > Locations > Page 2833 Rear Window Wiper/Washer Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Sensors and Switches > Sensors and Switches - Wiper and Washer Systems > Wiper Switch > Component Information > Locations > Page 2834 Wiper Switch: Service and Repair WIPER/WASHER SWITCH REPLACEMENT - REAR REMOVAL PROCEDURE 1. Remove the instrument panel (I/P) accessory trim plate. 2. Disconnect the electrical connector from the wiper washer switch. 3. Release the wiper washer switch locking tabs. 4. Remove the switch from the trim plate. INSTALLATION PROCEDURE 1. Position the switch to the trim plate. 2. Connect the electrical connector to the wiper washer switch. 3. Install the switch to the instrument panel trim plate, ensuring that the locking tabs are properly seated. 4. Install the I/P accessory trim plate. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications Alignment: Technical Service Bulletins Steering/Suspension - Wheel Alignment Specifications WARRANTY ADMINISTRATION Bulletin No.: 05-03-07-009C Date: December 09, 2010 Subject: Wheel Alignment Specifications, Requirements and Recommendations for GM Vehicles Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks Supercede: This bulletin is being extensively revised to provide technicians and warranty administrators with an all inclusive guide for wheel alignments. PLEASE FAMILIARIZE YOURSELF WITH THESE UPDATES BEFORE PERFORMING YOUR NEXT GM WHEEL ALIGNMENT SERVICE. Please discard Corporate Bulletin Number 05-03-07-009B (Section 03 - Suspension). Purpose The purpose of this bulletin is to provide retail, wholesale and fleet personnel with General Motors' warranty service requirements and recommendations for customer concerns related to wheel alignment. For your convenience, this bulletin updates and centralizes all of GM's Standard Wheel Alignment Service Procedures, Policy Guidelines and bulletins on wheel alignment warranty service. Important PLEASE FAMILIARIZE YOURSELF WITH THESE UPDATES BEFORE PERFORMING YOUR NEXT GM WHEEL ALIGNMENT SERVICE. The following five (5) key steps are a summary of this bulletin and are REQUIRED in completing a successful wheel alignment service. 1. Verify the vehicle is in an Original Equipment condition for curb weight, tires, wheels, suspension and steering configurations. Vehicles modified in any of these areas are not covered for wheel alignment warranty. 2. Review the customer concern relative to "Normal Operation" definitions. 3. Verify that vehicle is within the "Mileage Policy" range. 4. Document wheel alignment warranty claims appropriately for labor operations E2000 and E2020. The following information must be documented or attached to the repair order: - Customer concern in detail - What corrected the customer concern? - If a wheel alignment is performed: - Consult SI for proper specifications. - Document the "Before" AND "After" wheel alignment measurements/settings. - Completed "Wheel Alignment Repair Order Questionnaire" (form attached to this bulletin) 5. Use the proper wheel alignment equipment (preferred with print-out capability), process and the appropriate calibration maintenance schedules. Important If it is determined that a wheel alignment is necessary under warranty, use the proper labor code for the repair. E2000 for Steering Wheel Angle and/or Front Toe set or E2020 for Wheel Alignment Check/Adjust includes Caster, Camber and Toe set (Wheel alignment labor time for other component repairs is to be charged to the component that causes a wheel alignment operation.). The following flowchart is to help summarize the information detailed in this bulletin and should be used whenever a wheel alignment is performed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 2840 Verify Original Equipment Condition of the Vehicle - Verify that Original Equipment Tires and Wheels or Official GM Accessory Tires and Wheels are on the vehicle. - Verify that aftermarket suspension "Lift" or "Lowering" Kits or other suspension alterations have NOT been done to the vehicle. - Check for accidental damage to the vehicle; for example, severe pothole or curb impacts, collision damage that may have affected the wheel alignment of the vehicle; e.g., engine cradles, suspension control arms, axles, wheels, wheel covers, tires may show evidence of damage/impact. - Check to be sure vehicle has seen "Normal Use" rather than abuse; e.g., very aggressive driving may show up by looking at the tires and condition of the vehicle. - Check for other additional equipment items that may significantly affect vehicle mass such as large tool boxes, campers, snow plow packages (without the snowplow RPO), etc., especially in trucks and cutaway/incomplete vehicles. Significant additional mass can affect trim height and wheel alignment of the vehicle and may necessitate a customer pay wheel alignment when placed semi-permanently in the vehicle (Upfitter instructions are to realign the vehicle after placement of these types of items. (This typically applies to trucks and incomplete vehicles that can be upfit with equipment such as the above.) Customer Concerns, "Normal Operation" Conditions and "Mileage Policy" Possible Concerns The following are typical conditions that may require wheel alignment warranty service: 1. Lead/Pull: defined as "at a constant highway speed on a typical straight road, the amount of effort required at the steering wheel to maintain the vehicle's straight heading." Important Please evaluate for the condition with hands-on the steering wheel. Follow the "Vehicle Leads/Pulls" diagnostic tree located in SI to determine the cause of a lead/pull concern. Lead/Pull concerns can be due to road crown or road slope, tires, wheel alignment or even in rare circumstances a steering gear issue. Lead/pull concerns due to road crown are considered "Normal Operation" and are NOT a warrantable condition -- the customer should be advised that this is "Normal Operation." Important Some customers may comment on a "Lead/Pull" when they hold the steering wheel in a level condition. If so, this is more likely a "steering wheel angle" concern because the customer is "steering" the vehicle to obtain a "level" steering wheel. 2. Steering wheel angle to the left or right (counter-clockwise or clockwise, respectively): Defined as the steering wheel angle (clocking) deviation from "level" while maintaining a straight heading on a typical straight road. 3. Irregular or Premature tire wear: Slight to very slight "feathering" or "edge" wear on the shoulders of tires is NOT considered unusual and should even out with a tire rotation; if the customer is concerned about a "feathering" condition of the tires, the customer could be advised to rotate the tires earlier than the next scheduled mileage/maintenance interval (but no later than the next interval). Be sure to understand the customer's driving habits as this will also heavily influence the tire wear performance; tire wear from aggressive or abusive driving habits is NOT a warrantable condition. Important Slight or mild feathering, cupping, edge or heel/toe wear of tire tread shoulders is "normal" and can show up very early in a tire/vehicle service mileage; in fact, some new tires can show evidence of feathering from the factory. These issues do NOT affect the overall performance and tread life of the tire. Dealer personnel should always check the customer's maintenance records to ensure that tire inflation pressure is being maintained to placard and that the tires are being rotated (modified-X pattern) at the proper mileage intervals. Wheel alignments are NOT to be performed for the types of "Normal" Tire Feathering shown in Figures 1-4 below. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 2841 Figure 1: Full Tread View - "NORMAL" Tire "Feathering" Wear on the Shoulder/Adjacent/Center Ribs Figure 2: Tire Shoulder View Example 1 - "NORMAL" Tire "Feathering" Wear on the Shoulder Figure 3: Tire Shoulder View Example 2 - "NORMAL" Tire "Feathering" Wear Figure 4: Detail Side View of Tire Shoulder Area - "NORMAL" Tire "Feathering" Wear Important When a wheel alignment is deemed necessary for tire wear, be sure to document on the repair order, in as much detail as possible, the severity and type of tire wear (e.g., severe center wear or severe inside or outside shoulder wear) and the position of the tire on the vehicle (RF, LF, LR, RR). Please note the customer's concern with the wear such as, noise, appearance, wear life, etc. A field product report with pictures of the tire wear condition is recommended. Refer to Corporate Bulletin Number 02-00-89-002J and #07-00-89-036C. 4. Other repairs that affect wheel alignment; e.g., certain component replacement such as suspension control arm replacement, engine cradle adjustment/replace, steering gear replacement, steering tie rod replace, suspension strut/shock, steering knuckle, etc. may require a wheel alignment. Important If other components or repairs are identified as affecting the wheel alignment, policy calls for the wheel alignment labor time to be charged to the replaced/repaired component's labor operation time rather than the wheel alignment labor operations. Important Vibration type customer concerns are generally NOT due to wheel alignment except in the rare cases; e.g., extreme diagonal wear across the tread. In general, wheel alignments are NOT to be performed as an investigation/correction for vibration concerns. "Normal Operation" Conditions Vehicle Lead/Pull Due to Road Crown or Slope: As part of "Normal Operation," vehicles will follow side-to-side or left to right road crown or slope. Be sure to verify from the customer the types of roads they are driving as they may not recognize the influence of road crown on vehicle lead/pull and steering wheel angle. If a vehicle requires significant steering effort to prevent it from "climbing" the road crown there may be an issue to be looked into further. Important Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 2842 A wheel alignment will generally NOT correct vehicles that follow the road crown since this is within "Normal Operation." Mileage Policy The following mileage policy applies for E2020 and E2000 labor operations: Note Wheel Alignment is NOT covered under the New Vehicle Limited Warranty for Express and Savana Cutaway vehicles as these vehicles require Upfitters to set the wheel alignment after completing the vehicles. - 0-800 km (0-500 mi): E2000/E2020 claims ONLY allowed with Call Center Authorization. Due to the tie down during shipping, the vehicle's suspension requires some time to reach normal operating position. For this reason, new vehicles are generally NOT to be aligned until they have accumulated at least 800 km (500 mi). A field product report should accompany any claim within this mileage range. - 801-12,000 km (501-7,500 mi): - If a vehicle came from the factory with incorrect alignment settings, any resulting off-angle steering wheel, lead/pull characteristics or the rare occurrence of excessive tire wear would be apparent early in the life of the vehicle. The following policy applies: - Vehicles 100% Factory Set/Measured for Caster/Camber/Toe - Escalade/ESV/EXT, Tahoe/Suburban, Yukon/XL/Denali, Silverado/Sierra, Express/Savana, Corvette and Colorado/Canyon: E2000/E2020 Claims: Call Center Authorization Required - All Vehicles NOT 100% Factory Set/Measured for Caster/Camber/Toe as noted above: E2000/E2020 Claims: Dealer Service Manager Authorization Required - 12,001 km and beyond (7,501 miles and beyond): During this period, customers are responsible for the wheel alignment expense or dealers may provide on a case-by case basis a one-time customer enthusiasm claim up to 16,000 km (10,000 mi). In the event that a defective component required the use of the subject labor operations, the identified defective component labor operation will include the appropriate labor time for a wheel alignment as an add condition to the component repair. Important Only one wheel alignment labor operation claim (E2000 or E2020) may be used per VIN. Warranty Documentation Requirements When a wheel alignment service has been deemed necessary, the following items will need to be clearly documented on/with the repair order: - Customer concern in detail - What corrected the customer concern? - If a wheel alignment is performed: - Consult SI for proper specifications. - Document the "Before" AND "After" wheel alignment measurements/settings. - Completed "Wheel Alignment Repair Order Questionnaire" (form attached to this bulletin) 1. Document the customer concern in as much detail as possible on the repair order and in the warranty administration system. Preferred examples: - Steering wheel is off angle in the counterclockwise direction by approximately x degrees or clocking position. - Vehicle lead/pulls to the right at approximately x-y mph. Vehicle will climb the road crown. Severe, Moderate or Slight. - RF and LF tires are wearing on the outside shoulders with severe feathering. Important In the event of a lead/pull or steering wheel angle concern, please note the direction of lead/pull (left or right) or direction of steering wheel angle (clockwise or counterclockwise) on the repair order and within the warranty claim verbatim. Important In the event of a tire wear concern, please note the position on the vehicle and where the wear is occurring on the tire; i.e., the RF tire is wearing on the inside shoulder. 2. Document the technician's findings on cause and correction of the issue. Examples: - Reset LF toe from 0.45 degrees to 0.10 degrees and RF toe from -0.25 degrees to 0.10 degrees to correct the steering wheel angle from 5 degrees counterclockwise to 0 degrees. - Reset LF camber from 0.25 degrees to -0.05 degrees to correct the cross-camber condition of +0.30 degrees to 0.00 degrees on the vehicle. - Front Sum toe was found to be 0.50 degrees, reset to 0.20 degrees. 3. Print-out the "Before" and "After" wheel alignment measurements/settings and attach them to the Repair Order or if print-out capability is not Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 2843 available, measurements may also be clearly and legibly handwritten into the Wheel Alignment Repair Order Questionnaire attached to this bulletin. 4. Attach the Wheel Alignment Repair Order Questionnaire below along with the print-out of "Before" and "After" wheel alignment measurements to the Repair Order and retain for use by GM. Wheel Alignment Equipment and Process Wheel alignments must be performed with a quality machine that will give accurate results when performing checks. "External Reference" (image-based camera technology) is preferred. Please refer to Corporate Bulletin Number 05-00-89-029B: General Motors Dealership Critical Equipment Requirements and Recommendations. Requirements: - Computerized four wheel alignment system. - Computer capable of printing before and after alignment reports. - Computer capable of time and date stamp printout. - Racking system must have jacking capability - Racking system must be capable of level to 1.6 mm (1/16 in) - Appropriate wheel stops and safety certification - Built-in turn plates and slip plates - Wheel clamps capable of attaching to 20" or larger wheels - Racking capable of accepting any GM passenger car or light duty truck - Operator properly trained and ASE-certified (U.S. only) in wheel alignment Recommendations: Racking should have front and rear jacking capability. Equipment Maintenance and Calibration: Alignment machines must be regularly calibrated in order to give correct information. Most manufacturers recommend the following: - Alignment machines with "internal reference" sensors should be checked (and calibrated, if necessary) every six months. - Alignment machines with "external reference" (image-based camera technology) should be checked (and calibrated, if necessary) once a year. - Racks must be kept level to within 1.6 mm (1/16 in). - If any instrument that is part of the alignment machine is dropped or damaged in some way, check the calibration immediately. Check with the manufacturer of your specific equipment for their recommended service/calibration schedule. Wheel Alignment Process When performing wheel alignment measurement and/or adjustment, the following steps should be taken: Preliminary Steps: 1. Verify that the vehicle has a full tank of fuel (compensate as necessary). 2. Inspect the wheels and the tires for damage. 3. Inspect the tires for the proper inflation and irregular tire wear. 4. Inspect the wheel bearings for excessive play. 5. Inspect all suspension and steering parts for looseness, wear, or damage. 6. Inspect the steering wheel for excessive drag or poor return due to stiff or rusted linkage or suspension components. 7. Inspect the vehicle trim height. 8. Compensate for frame angle on targeted vehicles (refer to Wheel Alignment Specifications in SI). Satisfactory vehicle operation may occur over a wide range of alignment angles. However, if the wheel alignment angles are not within the range of specifications, adjust the wheel alignment to the specifications. Refer to Wheel Alignment Specifications in SI. Give consideration to excess loads, such as tool boxes, sample cases, etc. Follow the wheel alignment equipment manufacturer's instructions. Measure/Adjust: Important Prior to making any adjustments to wheel alignment on a vehicle, technicians must verify that the wheel alignment specifications loaded into their wheel alignment machine are up-to-date by comparing these to the wheel alignment specifications for the appropriate model and model year in SI. Using incorrect and/or outdated specifications may result in unnecessary adjustments, irregular and/or premature tire wear and repeat customer concerns Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 2844 Important When performing adjustments to vehicles requiring a 4-wheel alignment, set the rear wheel alignment angles first in order to obtain proper front wheel alignment angles. Perform the following steps in order to measure the front and rear alignment angles: 1. Install the alignment equipment according to the manufacturer's instructions. 2. Jounce the front and the rear bumpers 3 times prior to checking the wheel alignment. 3. Measure the alignment angles and record the readings. If necessary, adjust the wheel alignment to vehicle specification and record the before and after measurements. Refer to Wheel Alignment Specifications in SI. Important Technicians must refer to SI for the correct wheel alignment specifications. SI is the only source of GM wheel alignment specifications that is kept up-to-date throughout the year. Test drive vehicle to ensure proper repair. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 2845 Frame Angle Measurement (Express / Savana Only) ........ Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 2846 What corrected the customer concern and was the repair verified? Please Explain: ............. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Specifications > Fastener Tightening Specifications Fastener Tightening Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Specifications > Fastener Tightening Specifications > Page 2849 Trim Height Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Specifications > Fastener Tightening Specifications > Page 2850 Alignment: Specifications Wheel Alignment Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Specifications > Page 2851 Alignment: Description and Operation Caster Description Caster Description Caster is the tilting of the uppermost point of the steering axis either forward or backward, when viewed from the side of the vehicle. A backward tilt is positive (+) and a forward tilt is negative (-). Caster influences directional control of the steering but does not affect the tire wear. Caster is affected by the vehicle height, therefore it is important to keep the body at its designed height. Overloading the vehicle or a weak or sagging rear spring will affect caster. When the rear of the vehicle is lower than its designated trim height, the front suspension moves to a more positive caster. If the rear of the vehicle is higher than its designated trim height, the front suspension moves to a less positive caster. With too little positive caster, steering may be touchy at high speed and wheel returnability may be diminished when coming out of a turn. If one wheel has more positive caster than the other, that wheel will pull toward the center of the vehicle. This condition will cause the vehicle to pull or lead to the side with the least amount of positive caster. Camber Description Camber Description Camber is the tilting of the wheels from the vertical when viewed from the front of the vehicle. When the wheels tilt outward at the top, the camber is positive (+). When the wheel tilts inward at the top, the camber is negative (-). The amount of tilt is measured in degrees from the vertical. Camber settings influence the directional control and the tire wear. Too much positive camber will result in premature wear on the outside of the tire and cause excessive wear on the suspension parts. Too much negative camber will result in premature wear on the inside of the tire and cause excessive wear on the suspension parts. Unequal side-to-side camber of 1 degree or more will cause the vehicle to pull or lead to the side with the most positive camber. Toe Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Specifications > Page 2852 Toe Description Toe is a measurement of how much the front and/or rear wheels are turned in or out from a straight-ahead position. When the wheels are turned in, toe is positive (+). When the wheels are turned out, toe is negative (-). The actual amount of toe is normally only a fraction of a degree. The purpose of toe is to ensure that the wheels roll parallel. Toe also offsets the small deflections of the wheel support system that occur when the vehicle is rolling forward. In other words, with the vehicle standing still and the wheels set with toe-in, the wheels tend to roll parallel on the road when the vehicle is moving. Improper toe adjustment will cause premature tire wear and cause steering instability. Setback Description Setback applies to both the front and the rear wheels. Setback is the amount that one wheel may be aligned behind the other wheel. Setback may be the result of a road hazard or a collision. The first clue is a caster difference from side-to-side of more than 1 degree. Thrust Angles Description Thrust Angles Description The front wheels aim or steer the vehicle. The rear wheels control tracking. This tracking action relates to the thrust angle (3). The thrust angle is the path that the rear wheels take. Ideally, the thrust angle is geometrically aligned with the body centerline (2). In the illustration, toe-in is shown on the left rear wheel, moving the thrust line (1) off center. The resulting deviation from the centerline is the thrust angle. If the thrust angle is not set properly the vehicle may "dog track", the steering wheel may not be centered or it could be perceived as a bent axle. Thrust angle can be checked during a wheel alignment. Positive thrust angle means the thrust line is pointing to the right hand side (RHS) of the vehicle. Negative thrust angle means the thrust line is pointing to the left hand side (LHS) of the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Specifications > Page 2853 If the thrust angle is out of specification, moving the axle to body relationship will change the thrust angle reading. If the vehicle is out in the Positive (+) direction-moving the RHS forward and/or LHS rearward will move the thrust angle towards zero degrees. If the vehicle is out in the Negative (-) direction-moving the RHS rearward and/or LHS forward will move the thrust angle towards zero degrees. Lead/Pull Description At a constant highway speed on a typical straight road, lead/pull is the amount of effort required at the steering wheel to maintain the vehicle's straight path. Lead/pull is usually caused by the following factors: ^ Tire construction ^ Wheel alignment ^ Unbalanced steering gear The way in which a tire is built may produce lead/pull. The rear tires will not cause lead. Memory Steer Description Memory steer is when the vehicle wants to lead or pull in the direction the driver previously turned the vehicle. Additionally, after turning in the opposite direction, the vehicle will want to lead or pull in that direction. Wander Description Wander is the undesired drifting or deviation of a vehicle to either side from a straight path with hand pressure on the steering wheel. Wander is a symptom of the vehicle's sensitivity to external disturbances, such as road crown and crosswind, and accentuated by poor on-center steering feel. Scrub Radius Description Ideally, the scrub radius is as small as possible. Normally, the SAI angle and the centerline of the tire and the wheel intersect below the road surface, causing a positive scrub radius. With struts, the SAI angle is much larger than the long arm/short arm type of suspension. This allows the SAI angle to intersect the camber angle above the road surface, forming a negative scrub radius. The smaller the scrub radius, the better the directional stability. Installing aftermarket wheels that have additional offset will dramatically increase the scrub radius. The newly installed wheels may cause the centerline of the tires to move further away from the spindle. This will increase the scrub radius. A large amount of scrub radius can cause severe shimmy after hitting a bump. Four-wheel drive vehicles with large tires use a steering damper to compensate for an increased scrub radius. Scrub radius is not directly measurable by the conventional methods. Scrub radius is projected geometrically by engineers during the design phase of the suspension. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Service and Repair > Measuring Wheel Alignment Alignment: Service and Repair Measuring Wheel Alignment Measuring Wheel Alignment Steering and vibration complaints are not always the result of improper alignment. One possible cause is wheel and tire imbalance. Another possibility is tire lead due to worn or improperly manufactured tires. Lead/pull is defined as follows: At a constant highway speed on a typical straight road, lead/pull is the amount of effort required at the steering wheel to maintain the vehicle's straight path. Lead is the vehicle deviation from a straight path on a level road without pressure on the steering wheel. Refer to Radial Tire Lead/Pull Correction in order to determine if the vehicle has a tire lead problem. Before performing any adjustment affecting wheel alignment, perform the following inspections and adjustments in order to ensure correct alignment readings: ^ Inspect the tires for the proper inflation and irregular tire wear. Refer to Label - Vehicle Certification, Tire Place Card, Anti-Theft and Service Parts ID and Tire Diagnosis - Irregular or Premature Wear. ^ Inspect the runout of the wheels and the tires. Refer to Tire and Wheel Runout Specifications. ^ Inspect the wheel bearings for backlash and excessive play. Refer to Wheel Bearings Diagnosis. ^ Inspect the ball joints and tie rod ends for looseness or wear. ^ Inspect the control arms and stabilizer shaft for looseness or wear. ^ Inspect the steering gear for looseness at the frame. Refer to Fastener Tightening Specifications. ^ Inspect the struts/shock absorbers for wear, leaks, and any noticeable noises. Refer to Struts or Shock Absorbers On-Vehicle Testing. ^ Inspect the vehicle trim height. Refer to Trim Height Inspection Procedure. ^ Inspect the steering wheel for excessive drag or poor return due to stiff or rusted linkage or suspension components. ^ Inspect the fuel level. The fuel tank should be full or the vehicle should have a compensating load added. Give consideration to excess loads, such as tool boxes, sample cases, etc. If normally carried in the vehicle, these items should remain in the vehicle during alignment adjustments. Give consideration also to the condition of the equipment being used for the alignment. Follow the equipment manufacturer's instructions. Satisfactory vehicle operation may occur over a wide range of alignment settings. However, if the setting exceeds the service allowable specifications, correct the alignment to the service preferred specifications. Perform the following steps in order to measure the front and rear alignment angles: 1. Install the alignment equipment according to the manufacturer's instructions. 2. Jounce the front and the rear bumpers 3 times prior to checking the wheel alignment. 3. Measure the alignment angles and record the readings. 4. Adjust alignment angles to vehicle specification, if necessary. Important: When performing adjustments to vehicles requiring a 4-wheel alignment, set the rear wheel alignment angles first in order to obtain proper front alignment angles. Front Caster and Camber Adjustment The caster and camber adjustments are made by loosening the lower control arm adjustment bolts and repositioning the lower control arm. Important: Before adjusting the caster and camber angles, jounce the front bumper 3 times to allow the vehicle to return to normal height. Measure and adjust the caster and the camber with the vehicle at curb height. The front suspension Z dimension and the rear suspension D dimension are indicated in Trim Heights. Refer to Trim Height Inspection Procedure. 1. For an accurate reading, do not push or pull on the tires during the alignment process. 2. Determine the caster (2, 3) angle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Service and Repair > Measuring Wheel Alignment > Page 2856 3. Determine the camber (2, 3) angle. 4. Loosen the lower control arm adjustment bolts (1). Notice: Refer to Fastener Notice in Service Precautions. 5. Adjust the caster and the camber angle by repositioning the lower control arm (2) until the specifications have been met. When the adjustments are complete, hold the lower control arm in position so that the specifications do not change while tightening the lower control arm adjustment bolts. 1. Tighten the front lower control arm bracket mounting bolts to 260 Nm (192 ft. lbs.). 2. Tighten the rear lower control arm bracket mounting bolts to 240 Nm (177 ft. lbs.). 6. Verify that the caster and the camber are still within specifications. 7. When the caster and camber are within specifications, adjust the toe. Refer to Front Toe Adjustment. Front Toe Adjustment 1. Loosen the jam nut on the outer tie rod (2). 2. Rotate the inner tie rod (1) to the required toe specification setting. Notice: Care must be taken that the boots are not twisted when rotating the inner tie rods, or damage to the boots may result. 3. Tighten the jam nut on the outer tie rod. Tighten the outer tie rod jam nut to 75 Nm (55 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Check the toe setting after tightening. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Service and Repair > Measuring Wheel Alignment > Page 2857 5. Re-adjust the toe setting if necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Service and Repair > Measuring Wheel Alignment > Page 2858 Alignment: Service and Repair Trim Height Inspection Trim Height Inspection Procedure Trim Height Measurements Trim height is a predetermined measurement relating to vehicle ride height. Incorrect trim heights can cause bottoming out over bumps, damage to suspension components, and symptoms similar to wheel alignment problems. Inspect the trim heights when diagnosing suspension concerns and before inspecting the wheel alignment. Perform the following prior to measuring trim heights: ^ Make sure the vehicle is on a level surface, such as an alignment rack. ^ Set the tire pressures to specifications. ^ Check the fuel level. Add additional weight if necessary to simulate a full tank. ^ To ensure proper weight distribution, make sure the rear storage compartment is empty. ^ Close the doors and hood. Z Height Measurement The Z height measurement determines the proper ride height for the front end of the vehicle. Vehicles equipped with torsion bars use an adjusting arm to adjust the Z height. Vehicles without torsion bars have no adjustment and may require replacement of suspension components. Important: All dimensions are measured vertical to the ground. Cross vehicle Z heights should be within 24 mm (0.9 inch). 1. Place hands on the front bumper and jounce the front of the vehicle. Make sure that there is at least 38 mm (1.5 inch) of movement while jouncing. 2. Allow the vehicle to settle into position. 3. Measure from the centerline (1) of the lower control arm bushing bolt (4) down to the machined edge of the steering knuckle (2) in order to obtain Z height measurement (3). 4. Repeat the jouncing operation and measurement 2 more times for a total of 3 times. 5. Use the highest and lowest measurements to calculate the average height. 6. The true Z height dimension number is the average of the high and the low measurements. 7. If these measurements are out of specifications, inspect for the following conditions: ^ Sagging front suspension^ Collision damage D Height Measurement The D height measurement determines the proper ride height for the rear end of the vehicle. There is no adjustment procedure. Repair may require replacement of suspension components. Important: All dimensions are measured vertical to the ground. Cross vehicle D heights should be within 12 mm (0.5 inch) for vehicles equipped with coil springs. Vehicles equipped with air suspension should be within 8 mm (0.3 inch). 1. Place hands on the rear bumper and jounce the rear of the vehicle. Make sure that there is at least 38 mm (1.5 inch) of movement while jouncing. 2. Allow the vehicle to settle into position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Alignment > System Information > Service and Repair > Measuring Wheel Alignment > Page 2859 3. Measure the D height by measuring vertical distance (2) between the jounce bumper reinforcement bracket (4) on the frame (1) and the top surface of the axle tube (3). 4. Repeat the jouncing operation and measurement 2 more times for a total of 3 times. 5. Use the highest and lowest measurements to calculate the average height. 6. The true D height dimension is the average of the highest and lowest measurements. 7. If these measurements are out of specifications, inspect for the following conditions: ^ Sagging rear suspension-Refer to Coil Spring Replacement or Symptoms - Air Suspension. See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic )/Testing and Inspection/Symptom Related Diagnostic Procedures/A Symptoms - Air Suspension ^ Collision damage Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > Specifications Fuel Pressure: Specifications Fuel Pressure (Key ON, Engine OFF).................................................................................................. ..............................................385-425 kPa (55-62 psi) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal Fuel Pressure: Testing and Inspection Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 2866 Fuel Pressure: Testing and Inspection Fuel System Diagnosis FUEL SYSTEM DIAGNOSIS SYSTEM DESCRIPTION The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON. The fuel system is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions. The fuel tank stores the fuel supply. An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times. TEST Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 2867 Step 1 - Step 5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 2868 Step 6 - Step 13 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Idle Speed > System Information > Specifications Idle Speed: Specifications Information not supplied by the manufacturer. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: Customer Interest Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 2881 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: All Technical Service Bulletins Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 2887 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 2888 Air Filter Element: Service and Repair AIR CLEANER ELEMENT REPLACEMENT REMOVAL PROCEDURE 1. Remove the air cleaner outlet duct. 2. Disconnect the mass air flow (MAF) / intake air temperature (IAT) sensor electrical connector (1). 3. Remove the radiator support diagonal brace. 4. Loosen the 4 air cleaner cover retaining screws (1). 5. Remove the air cleaner housing cover (2). Lift and rotate the cover in order to remove the cover from the vehicle. 6. Remove the air filter element (6) and the MAF/IAT sensor (3) from the lower air cleaner housing/washer solvent tank assembly (4). 7. Separate the air filter element (6) from the MAF/IAT sensor (3). 8. Inspect the entire assembly for dust, debris, or water. Clean or replace as necessary. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 2889 1. Install the MAF/IAT sensor (3) to the air filter element (6). 2. Install the air filter element (6) and MAF/IAT sensor (3) to the lower air cleaner housing/washer solvent tank assembly (4). 3. Install the air cleaner cover (2) and secure with 4 retaining screws (1). NOTE: Refer to Fastener Notice. IMPORTANT: Ensure the air inlet duct (5) is properly positioned in the lower air cleaner housing/washer solvent tank assembly (4) before installing the air cleaner cover (2). Tighten the screws to 4 N.m (35 lb in). 4. Install the radiator support diagonal brace. 5. Connect the MAF/IAT sensor electrical connector (1). 6. Install the air cleaner outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure Fuel Pressure Release: Service and Repair Fuel Pressure Relief Procedure FUEL PRESSURE RELIEF PROCEDURE TOOLS REQUIRED J 34730-1A Fuel Pressure Gage 1. Disconnect the negative battery cable. 2. Install J 34730-1A. 3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure. 4. Open the valve on J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing. 5. Drain any fuel remaining in the gage into an approved container. 6. Once the system pressure is completely relieved, remove J 34730-1A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure > Page 2895 Fuel Pressure Release: Service and Repair Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications Ignition Cable: Specifications Spark Plug Wire Resistance................................................................................................................. ................................................397 - 1,337 ohms per ft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications > Page 2899 Ignition Cable: Testing and Inspection SPARK PLUG WIRE INSPECTION Spark plug wire integrity is vital for proper engine operation. A thorough inspection is necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions: 1. Correct routing of the spark plug wires - Incorrect routing may cause cross-firing. 2. Any signs of cracks or splits in the wires. 3. Inspect each boot for the following conditions: - Tearing - Piercing - Arcing - Carbon tracking - Corroded terminal If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or terminal, replace the wire and the component connected to the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications > Page 2900 Ignition Cable: Service and Repair SPARK PLUG WIRE REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield, if necessary. 2. Remove the spark plug wire from the spark plug. - Twist each spark plug 1/2 turn. - Pull only on the boot in order to remove the wire from each spark plug. 3. Remove the spark plug wire from the ignition coil. - Twist each spark plug boot 1/2 turn. - Pull only on the boot in order to remove the wires from the ignition coil. INSTALLATION PROCEDURE 1. Install the spark plug wire to the ignition coil. 2. Install the spark plug wire to the spark plug. 3. Inspect the wires for proper installation: - Push sideways on each boot in order to inspect the seating. - Reinstall any loose boot. 4. Install the intake manifold sight shield, if necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Spark Plug Gap Spark Plug: Specifications Spark Plug Gap Spark Plug Gap ................................................................................................................................... .................................................... 1.02 mm (0.040 in.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Spark Plug Gap > Page 2905 Spark Plug: Specifications Spark Plug Torque Spark Plug Torque ............................................................................................................................... ................................................... 15 Nm (11.0 lb. ft.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 2906 Spark Plug: Application and ID SPARK PLUG TYPE GM P/N ................................................................................................................................................ .............................................................. 12571164 AC P/N ................................................................................................................................................. .................................................................. 41-985 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 2907 Spark Plug: Testing and Inspection SPARK PLUG INSPECTION - Verify that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to Ignition System Specifications for the correct spark plug. - Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions: Spark plug fouling - Colder plug - Pre-ignition causing spark plug and/or engine damage - Hotter plug - Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1) - Test for a loose terminal post (1) by twisting and pulling the post. The terminal post should not move. - Inspect the insulator (2) for flashover or carbon tracking, or soot. This is caused by the electrical charge traveling across the insulator between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. - Inspect the spark plug recess are of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated will cause arcing to ground. - Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3,4). - Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3). An excessively wide electrode gap can prevent correct spark plug operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 2908 - Inspect for the correct spark plug torque. Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. - Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). - Inspect for a broken or worn side electrode (3). - Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. - A looses center electrode (4) reduces the spark intensity. - Inspect for bridged electrodes (3,4). Deposits on the electrodes (3,4) reduce or eliminates the gap. - Inspect for worn or missing platinum pads on the electrodes (3,4), if equipped. - Inspect for excessive fouling. - Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation. Visual Inspection Normal operation - Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives. - Carbon fouled - Dry, fluffy black carbon, or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors - Excessive fuel pressure - Restricted air filter element - Incorrect combustion - Reduced ignition system voltage output Weak ignition coils - Worn ignition wires - Incorrect spark plug gap - Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off. - Deposit fouling - Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark plug intensity. Most powdery deposits will not affect spark plug intensity unless they form into a glazing over the electrode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 2909 Spark Plug: Service and Repair SPARK PLUG REPLACEMENT REMOVAL PROCEDURE 1. Remove the spark plug wire. 2. Remove the washer solvent container to gain access to the #2 spark plug. 3. Loosen the spark plug 1-2 turns. 4. Brush or using compressed air, blow away any dirt from around the spark plug. 5. Remove the spark plug.If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 2910 1. Correctly position the spark plug washer. 2. Inspect the spark plug gap. Adjust the gap as needed. Spark plug gap: 1.524 mm (0.060 in) 3. Hand start the spark plug in the corresponding cylinder. 4. Tighten the spark plug. - For used heads, tighten the plug to 15 N.m (11 lb ft). - For NEW heads, tighten the plug to 20 N.m (15 lb ft). NOTE: Refer to Fastener Notice. 5. Install the spark plug wire. 6. If removed, install the washer solvent container. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Compression Check > System Information > Specifications Compression Check: Specifications No cylinder should read less than ............................................................................................................................................................ 690 kPa (100 psi). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Tune-up and Engine Performance Checks > Compression Check > System Information > Specifications > Page 2914 Compression Check: Testing and Inspection Engine Compression Test 1. Charge the battery if the battery is not fully charged. 2. Disable the ignition system. 3. Disable the fuel injection system. 4. Remove all spark plugs. 5. Turn the ignition to the ON position. 6. Depress the accelerator pedal to position the throttle plate wide open. 7. Start with the compression gage at zero and crank the engine through 4 compression strokes, 4 puffs. 8. Measure the compression for each cylinder. Record the readings. 9. If a cylinder has low compression, inject approximately 15 ml (1 tablespoon) of engine oil into the combustion chamber through the spark plug hole. Measure the compression again and record the reading. 10. The minimum compression in any 1 cylinder should not be less than 70 percent of the highest cylinder. No cylinder should read less than 690 kPa (100 psi). For example, if the highest pressure in any 1 cylinder is 1,035 kPa (150 psi), the lowest allowable pressure for any other cylinder would be 725 kPa (105 psi). (1,035 x 70% = 725) (150 x 70% = 105). ^ Normal - Compression builds up quickly and evenly to the specified compression for each cylinder. ^ Piston Rings Leaking - Compression is low on the first stroke. Compression builds up with the following strokes, but does not reach normal. Compression improves considerably when you add oil. ^ Valves Leaking - Compression is low on the first stroke. Compression usually does not build up on the following strokes. Compression does not improve much when you add oil. ^ If 2 adjacent cylinders have lower than normal compression, and injecting oil into the cylinders does not increase the compression, the cause may be a head gasket leaking between the cylinders. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Timing Component Alignment Marks > Component Information > Locations Timing Component Alignment Marks: Locations Inspect for proper alignment of the camshaft and crankshaft sprocket timing marks (1, 2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Technical Service Bulletins > Engine - Drive Belt Misalignment Diagnostics Drive Belt: Technical Service Bulletins Engine - Drive Belt Misalignment Diagnostics INFORMATION Bulletin No.: 08-06-01-008A Date: July 27, 2009 Subject: Diagnosing Accessory Drive Belt / Serpentine Belt Noise and Availability and Use of Kent-Moore EN-49228 Laser Alignment Tool - Drive Belt Models: 2010 and Prior GM Passenger Cars and Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 Vehicles 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to add a model year and update the Tool Information. Please discard Corporate Bulletin Number 08-06-01-008 (Section 06 - Engine). Background Several aftermarket companies offer laser alignment tools for accessory drive systems that can be very helpful in eliminating drive belt noise as a result of misaligned pulleys. Typically pricing ranges from $160 - $200. EN-49228 Laser Alignment Tool - Drive Belt The GM Tool program has now made available a competitive, simple to use and time-saving laser tool to assist in achieving precise alignment of the drive belt pulleys. This optional tool removes the guesswork from proper pulley alignment and may serve to reduce comebacks from: - Drive Belt Noise - Accelerated Drive Belt Wear - Drive Belt Slippage Instructions The instructions below are specific only to the truck Gen IV V-8 family of engines. These instructions are only for illustrative purposes to show how the tool may be used. Universal instructions are included in the box with the Laser Alignment Tool - Drive Belt. Caution - Do not look directly into the beam projected from the laser. - Use caution when shining the laser on highly polished or reflective surfaces. Laser safety glasses help reduce laser beam glare in many circumstances. - Always use laser safety glasses when using the laser. Laser safety glasses are not designed to protect eyes from direct laser exposure. 1. Observe and mark the serpentine belt orientation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Technical Service Bulletins > Engine - Drive Belt Misalignment Diagnostics > Page 2922 2. Remove the serpentine belt from the accessory drive system. 3. Install the tool onto the power steering pulley. Position the legs of the tool into the outer grooves of the pulley, farthest from the front of the engine. 4. Install the retaining cord around the pulley and to the legs of the tool. 5. Put on the laser safety glasses provided with the tool. 6. Depress the switch on the rear of the tool to activate the light beam. 7. Rotate the power steering pulley as required to project the light beam onto the crankshaft balancer pulley grooves. 8. Inspect for proper power steering pulley alignment. - If the laser beam projects onto the second rib or raised area (1), the pulleys are aligned properly. - If the laser beam projects more than one-quarter rib 0.9 mm (0.035 in) mis-alignment, adjust the position of the power steering pulley as required. - Refer to SI for Power Steering Pulley Removal and Installation procedures. 9. Install the serpentine belt to the accessory drive system in the original orientation. 10. Operate the vehicle and verify that the belt noise concern is no longer present. Tool Information Please visit the GM service tool website for pricing information or to place your order for this tool. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Technical Service Bulletins > Engine - Drive Belt Misalignment Diagnostics > Page 2923 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Technical Service Bulletins > Page 2924 Drive Belt: Description and Operation Drive Belt System Description The drive belt system consists of the following components: ^ The drive belt ^ The drive belt tensioner ^ The drive belt idler pulley ^ The crankshaft balancer pulley ^ The accessory drive component mounting brackets ^ The accessory drive components ^ The power steering pump, if belt driven ^ The generator ^ The A/C compressor, if equipped ^ The engine cooling fan, if belt driven ^ The water pump, if belt driven ^ The vacuum pump, if equipped ^ The air compressor, if equipped The drive belt system may use 1 belt or 2 belts. The drive belt is thin so that it can bend backwards and has several ribs to match the grooves in the pulleys. There also may be a V-belt style belt used to drive certain accessory drive components. The drive belts are made of different types of rubbers - chloroprene or EPDM - and have different layers or plies containing either fiber cloth or cords for reinforcement. Both sides of the drive belt may be used to drive the different accessory drive components. When the back side of the drive belt is used to drive a pulley, the pulley is smooth. The drive belt is pulled by the crankshaft balancer pulley across the accessory drive component pulleys. The spring loaded drive belt tensioner keeps constant tension on the drive belt to prevent the drive belt from slipping. The drive belt tensioner arm will move when loads are applied to the drive belt by the accessory drive components and the crankshaft. The drive belt system may have an idler pulley, which is used to add wrap to the adjacent pulleys. Some systems use an idler pulley in place of an accessory drive component when the vehicle is not equipped with the accessory. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis Drive Belt: Testing and Inspection Drive Belt Chirping Diagnosis Drive Belt Chirping Diagnosis Diagnostic Aids The chirping noise may be intermittent due to moisture on the drive belts or the accessory drive pulleys. In order to duplicate the customer's concern, it may be necessary to spray a small amount of water onto the drive belts. If spraying water onto the drive belts duplicates the symptom, cleaning the accessory drive pulleys may be the most probable solution. A loose or improper installation of a body or suspension component, or other items on the vehicle may also cause the chirping noise. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2927 Step 1 - Step 14 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2928 Step 15 The numbers below refer to the steps in the diagnostic table. 2. The chirping noise may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed any further in this table. 3. The noise may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, this will verify if the chirping noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts for signs of pilling. Pilling is the small balls, pills, or strings in the drive belt grooves caused by the accumulation of rubber dust. 6. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of an accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned accessory drive pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that pulley. 10. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. 12. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage to the pulleys that would prevent the drive belts from seating properly in the pulley grooves or on the smooth surface of the pulley when the back side of the drive belt is used to drive the pulley. 14. Replacing the drive belts when it is not damaged or there is not excessive pilling will only be a temporary repair. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2929 Drive Belt: Testing and Inspection Drive Belt Excessive Wear Diagnosis Drive Belt Excessive Wear Diagnosis Diagnostic Aids Excessive wear on a drive belts is usually caused by incorrect installation or the incorrect drive belts for the application. Minor misalignment of the accessory drive pulleys will not cause excessive wear, but will probably cause the drive belts to make a noise or fall off. Excessive misalignment of the accessory drive pulleys will cause excessive wear and may also make the drive belts fall off. Test Description Step 1 - Step 6 The numbers below refer to the steps in the diagnostic table. 2. This inspection is to verify that the drive belts is correctly installed on all of the accessory drive pulleys. Wear on the drive belts may be caused by incorrect positioning of the drive belts by one or more grooves on a pulley. 3. The installation of a drive belts that is too wide or too narrow will cause wear on the drive belts. The drive belts ribs should match all of the grooves on the pulleys. 4. This inspection is to verify that the drive belts is not contacting any part of the engine or body while the engine is operating. Provide sufficient clearance when the accessory drive components load varies. The drive belts should not come in contact with an engine or a body component when snapping the throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2930 Drive Belt: Testing and Inspection Drive Belt Falls Off Diagnosis Drive Belt Falls Off Diagnosis Diagnostic Aids If the drive belts repeatedly falls off the accessory drive pulleys, this may be caused by a pulley misalignment. An extra load that is quickly applied or released by an accessory drive component may also cause the drive belts to fall off. Verify that the accessory drive components are operating properly. If the drive belts is the incorrect length, the drive belt tensioner may not maintain the proper tension on the drive belts. Test Description Step 1 - Step 12 The numbers below refer to the steps in the diagnostic table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2931 2. This inspection is to verify the condition of the drive belts. Damage may have occurred to the drive belts when the drive belts fell off the pulley. Inspect the drive belts for cuts, tears, sections of ribs missing, or damaged belt plies. 4. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure of that pulley. 5. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage that would prevent the drive belt from seating properly in the pulley grooves or on the smooth surface of a pulley when the back side of the drive belts is used to drive the pulley. 6. Accessory drive component brackets that are bent or cracked will also cause the drive belts to fall off. 7. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. Missing, loose, or incorrect fasteners may cause pulley misalignment from the accessory drive brackets moving under load. Over tightening the fasteners may cause misalignment of the accessory component brackets. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2932 Drive Belt: Testing and Inspection Drive Belt Rumbling Diagnosis Diagnostic Information and Procedures Drive Belt Rumbling Diagnosis Diagnostic Aids Vibration from the engine operating may cause a body component or another part of the vehicle to make rumbling noise. The drive belts may have a condition that can not be seen or felt. Sometimes replacing the drive belts may be the only repair for the symptom. If after replacing the drive belts and completing the diagnostic table, the rumbling is only heard with the drive belts installed, there might be an accessory drive component failure. Varying the load on the accessory drive components may aid in identifying which component is causing the rumbling noise. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2933 Step 1 - Step 8 The numbers below refer to the steps in the diagnostic table. 2. This test is to verify that the symptom is present during diagnosing. Other vehicle components may cause a similar symptom. 3. This test is to verify that the drive belts is causing the rumbling. Rumbling may be confused with an internal engine noise due to the similarity in the description. Remove only one drive belt at a time if the vehicle has multiple drive belts. Operate the engine for a few seconds, this will verify if the rumbling noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts to ensure that the drive belts is not the cause of the noise. Small cracks across the ribs of the drive belts will not cause the noise. Belt separation is identified by the plies of the belt separating, this may be seen at the edge of the belt or felt as a lump in the belt. 5. Small amounts of pilling is a normal condition and acceptable. When the pilling is severe the drive belts does not have a smooth surface for proper operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2934 Drive Belt: Testing and Inspection Drive Belt Chirping Diagnosis Drive Belt Chirping Diagnosis Diagnostic Aids The chirping noise may be intermittent due to moisture on the drive belts or the accessory drive pulleys. In order to duplicate the customer's concern, it may be necessary to spray a small amount of water onto the drive belts. If spraying water onto the drive belts duplicates the symptom, cleaning the accessory drive pulleys may be the most probable solution. A loose or improper installation of a body or suspension component, or other items on the vehicle may also cause the chirping noise. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2935 Step 1 - Step 14 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2936 Step 15 The numbers below refer to the steps in the diagnostic table. 2. The chirping noise may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed any further in this table. 3. The noise may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, this will verify if the chirping noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts for signs of pilling. Pilling is the small balls, pills, or strings in the drive belt grooves caused by the accumulation of rubber dust. 6. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of an accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned accessory drive pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that pulley. 10. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. 12. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage to the pulleys that would prevent the drive belts from seating properly in the pulley grooves or on the smooth surface of the pulley when the back side of the drive belt is used to drive the pulley. 14. Replacing the drive belts when it is not damaged or there is not excessive pilling will only be a temporary repair. Drive Belt Excessive Wear Diagnosis Drive Belt Excessive Wear Diagnosis Diagnostic Aids Excessive wear on a drive belts is usually caused by incorrect installation or the incorrect drive belts for the application. Minor misalignment of the accessory drive pulleys will not cause excessive wear, but will probably cause the drive belts to make a noise or fall off. Excessive misalignment of the accessory drive pulleys will cause excessive wear and may also make the drive belts fall off. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2937 Step 1 - Step 6 The numbers below refer to the steps in the diagnostic table. 2. This inspection is to verify that the drive belts is correctly installed on all of the accessory drive pulleys. Wear on the drive belts may be caused by incorrect positioning of the drive belts by one or more grooves on a pulley. 3. The installation of a drive belts that is too wide or too narrow will cause wear on the drive belts. The drive belts ribs should match all of the grooves on the pulleys. 4. This inspection is to verify that the drive belts is not contacting any part of the engine or body while the engine is operating. Provide sufficient clearance when the accessory drive components load varies. The drive belts should not come in contact with an engine or a body component when snapping the throttle. Drive Belt Falls Off Diagnosis Drive Belt Falls Off Diagnosis Diagnostic Aids If the drive belts repeatedly falls off the accessory drive pulleys, this may be caused by a pulley misalignment. An extra load that is quickly applied or released by an accessory drive component may also cause the drive belts to fall off. Verify that the accessory drive components are operating properly. If the drive belts is the incorrect length, the drive belt tensioner may not maintain the proper tension on the drive belts. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2938 Step 1 - Step 12 The numbers below refer to the steps in the diagnostic table. 2. This inspection is to verify the condition of the drive belts. Damage may have occurred to the drive belts when the drive belts fell off the pulley. Inspect the drive belts for cuts, tears, sections of ribs missing, or damaged belt plies. 4. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure of that pulley. 5. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage that would prevent the drive belt from seating properly in the pulley grooves or on the smooth surface of a pulley when the back side of the drive belts is used to drive the pulley. 6. Accessory drive component brackets that are bent or cracked will also cause the drive belts to fall off. 7. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. Missing, loose, or incorrect fasteners may cause pulley misalignment from the accessory drive brackets moving under load. Over tightening the fasteners may cause misalignment of the accessory component brackets. Drive Belt Rumbling Diagnosis Diagnostic Information and Procedures Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2939 Drive Belt Rumbling Diagnosis Diagnostic Aids Vibration from the engine operating may cause a body component or another part of the vehicle to make rumbling noise. The drive belts may have a condition that can not be seen or felt. Sometimes replacing the drive belts may be the only repair for the symptom. If after replacing the drive belts and completing the diagnostic table, the rumbling is only heard with the drive belts installed, there might be an accessory drive component failure. Varying the load on the accessory drive components may aid in identifying which component is causing the rumbling noise. Test Description Step 1 - Step 8 The numbers below refer to the steps in the diagnostic table. 2. This test is to verify that the symptom is present during diagnosing. Other vehicle components may cause a similar symptom. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2940 3. This test is to verify that the drive belts is causing the rumbling. Rumbling may be confused with an internal engine noise due to the similarity in the description. Remove only one drive belt at a time if the vehicle has multiple drive belts. Operate the engine for a few seconds, this will verify if the rumbling noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts to ensure that the drive belts is not the cause of the noise. Small cracks across the ribs of the drive belts will not cause the noise. Belt separation is identified by the plies of the belt separating, this may be seen at the edge of the belt or felt as a lump in the belt. 5. Small amounts of pilling is a normal condition and acceptable. When the pilling is severe the drive belts does not have a smooth surface for proper operation. Drive Belt Squeal Diagnosis Drive Belt Squeal Diagnosis Diagnostic Aids A loose or improper installation of a body, or suspension component, or other items on the vehicle may cause the squeal noise. If the squeal is intermittent, verify that it is not the accessory drive components by varying their loads, making sure they are operating to their maximum capacity. An overcharged air conditioning (A/C) system, a power steering system restriction or the incorrect fluid, or a failing generator are suggested items to inspect. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2941 Step 1 - Step 9 The numbers below refer to the steps in the diagnostic table. 2. The squeal may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed further in this table 3. The squeal may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, this will verify if the squealing noise is related to the drive belts or an accessory drive component. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. This test is to verify that an accessory drive components does not have a seized bearing. With the belts removed, test the bearings in the accessory drive components for smooth operation. Also test the accessory drive components with the engine operating by varying the load on the accessory drive components to verify that the components is operating properly. 5. This test is to verify that the drive belts tensioners are not operating properly. If the drive belt tensioners are not operating properly, proper belt tension may not be achieved to keep the drive belts from slipping which could cause a squealing noise. 6. This test is to verify that the drive belts is not too long, which would prevent the drive belt tensioners from operating properly. Also if the incorrect length drive belts was installed, it may not be routed correctly and may be turning an accessory drive component in the incorrect direction. 7. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that pulley. 8. Inspect the accessory drive pulleys to verify that they are the correct diameter or width. Using a known good vehicle, compare the accessory drive pulleys. Drive Belt Vibration Diagnosis Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2942 Drive Belt Vibration Diagnosis Diagnostic Aids The accessory drive components may have an affect on engine vibration. An overcharged air conditioning (A/C) system, a power steering system restriction, or the incorrect fluid, or an extra load placed on the generator are suggested items to inspect. To help identify an intermittent or an improper condition, vary the loads on the accessory drive components. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2943 Step 1 - Step 11 The numbers below refer to the steps in the diagnostic table. 2. This test is to verify that the vibration is present during diagnosing. Other vehicle components may cause a similar symptom such as the exhaust system, or the drivetrain. 3. This test is to verify that the drive belts or accessory drive components may be causing the vibration. Remove the drive belts and operate the engine for a few seconds, this will verify if the vibration is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. The drive belts may cause a vibration. While the drive belts is removed this is the best time to inspect the condition of the drive belts. 6. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. 8. This step should only be performed if the fan is driven by the drive belt. Inspect the engine cooling fan for bent, twisted, loose, or cracked blades. Inspect the fan clutch for smooth operation. Inspect for a bent fan shaft or bent mounting flange. 9. Inspect the water pump drive shaft for being bent. Also inspect the water pump bearings for smooth operation and excessive play. Compare the water pump with a known, good water pump. 10. Accessory drive component brackets that are bent, cracked, or loose may put an extra strain on that accessory drive component causing it to vibrate. Drive Belt Whine Diagnosis Drive Belt Whine Diagnosis Diagnostic Aids The drive belts will not cause the whine. If the whine is intermittent, verify that it is not the accessory drive components by varying their loads, making sure they are operating to their maximum capacity. An overcharged air conditioning (A/C) system, a power steering system restriction or the incorrect fluid, or a failing generator are suggested items to inspect. Test Description Step 1 - Step 5 The numbers below refer to the steps in the diagnostic table. 3. This test is to verify that the whine is being caused by the accessory drive components. Remove the drive belts and operate the engine for a few seconds, this will verify if the whining noise is related to the accessory drive component. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. This inspection should include checking the drive belt tensioner and the drive belt idler pulley bearings. The drive belts may have to be installed and the accessory drive components operated separately by varying their loads. Refer to the suspected accessory drive component for the proper Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 2944 removal and installation procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Service and Repair > Drive Belt Replacement - Accessory Drive Belt: Service and Repair Drive Belt Replacement - Accessory Drive Belt Replacement - Accessory Removal Procedure 1. Remove the air cleaner resonator outlet duct. 2. Install a breaker bar with hex-head socket to the drive belt tensioner bolt. 3. Rotate the drive belt tensioner clockwise in order to relieve tension on the belt. 4. Remove the belt from the generator pulley. 5. Slowly release the tension on the drive belt tensioner. 6. Remove the breaker bar and socket and from the drive belt tensioner bolt. 7. Remove the belt from the remaining pulleys. 8. Clean and inspect the belt surfaces of all the pulleys. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Service and Repair > Drive Belt Replacement - Accessory > Page 2947 1. Route the drive belt around all the pulleys except the generator pulley. 2. Install the breaker bar with hex-head socket to the belt tensioner bolt. 3. Rotate the belt tensioner clockwise in order to relieve the tension on the belt. 4. Install the drive belt on the generator pulley. 5. Slowly release the tension on the belt tensioner. 6. Remove the breaker bar and socket from the belt tensioner bolt. 7. Inspect the drive belt for proper installation and alignment. 8. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Drive Belt > Component Information > Service and Repair > Drive Belt Replacement - Accessory > Page 2948 Drive Belt: Service and Repair Drive Belt Replacement - Air Conditioning Drive Belt Replacement - Air Conditioning Removal Procedure 1. Remove the accessory drive belt. 2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 3. Install a ratchet into the square opening of the air conditioning (A/C) belt tensioner. 4. Rotate the A/C belt tensioner clockwise in order to relieve tension on the belt. 5. Remove the A/C belt from the pulleys. 6. Slowly release the tension on the A/C belt tensioner. 7. Remove the ratchet from the A/C belt tensioner. 8. Clean and inspect the belt surfaces of all the pulleys. Installation Procedure 1. Install the A/C belt around the crankshaft balancer. 2. Install a ratchet into the square opening of the A/C drive belt tensioner. 3. Rotate the A/C belt tensioner clockwise in order to relieve tension on the belt. 4. Install the A/C belt over the idler pulley. 5. Install the A/C belt around the A/C compressor pulley. 6. Slowly release the tension on the A/C belt tensioner. 7. Remove the ratchet from the A/C belt tensioner. 8. Inspect the A/C belt for proper installation and alignment. 9. Lower the vehicle. 10. Install the accessory drive belt. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T Shift/Driveability Concerns/MIL ON Air Filter Element: Customer Interest Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T Shift/Driveability Concerns/MIL ON > Page 2959 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: All Technical Service Bulletins Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Air Filter Element: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 2965 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 2966 Air Filter Element: Service and Repair AIR CLEANER ELEMENT REPLACEMENT REMOVAL PROCEDURE 1. Remove the air cleaner outlet duct. 2. Disconnect the mass air flow (MAF) / intake air temperature (IAT) sensor electrical connector (1). 3. Remove the radiator support diagonal brace. 4. Loosen the 4 air cleaner cover retaining screws (1). 5. Remove the air cleaner housing cover (2). Lift and rotate the cover in order to remove the cover from the vehicle. 6. Remove the air filter element (6) and the MAF/IAT sensor (3) from the lower air cleaner housing/washer solvent tank assembly (4). 7. Separate the air filter element (6) from the MAF/IAT sensor (3). 8. Inspect the entire assembly for dust, debris, or water. Clean or replace as necessary. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 2967 1. Install the MAF/IAT sensor (3) to the air filter element (6). 2. Install the air filter element (6) and MAF/IAT sensor (3) to the lower air cleaner housing/washer solvent tank assembly (4). 3. Install the air cleaner cover (2) and secure with 4 retaining screws (1). NOTE: Refer to Fastener Notice. IMPORTANT: Ensure the air inlet duct (5) is properly positioned in the lower air cleaner housing/washer solvent tank assembly (4) before installing the air cleaner cover (2). Tighten the screws to 4 N.m (35 lb in). 4. Install the radiator support diagonal brace. 5. Connect the MAF/IAT sensor electrical connector (1). 6. Install the air cleaner outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Cabin Air Filter > Component Information > Service and Repair Cabin Air Filter: Service and Repair This vehicle does not have a factory installed cabin filter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Fluid Filter - A/T > Component Information > Service and Repair Fluid Filter - A/T: Service and Repair Automatic Transmission Fluid/Filter Replacement Removal Procedure Caution: When the transmission is at operating temperatures, take necessary precautions when removing the drain plug, to avoid being burned by draining fluid. 1. Raise and support the vehicle. 2. Place a drain pan under the transmission oil pan. 3. Remove the oil pan drain plug, if equipped. 4. If necessary, remove the bolts and position aside the range selector cable bracket for clearance while lowering the pan. It is not necessary to remove the cable from the lever or bracket. 5. Remove the oil pan bolts from the front and sides of the pan only. 6. Loosen the rear oil pan bolts approximately 4 turns. 7. Lightly tap the oil pan with a rubber mallet in order to loosen the pan to allow the fluid to drain. 8. Remove the remaining oil pan bolts. 9. Remove the oil pan and the gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Fluid Filter - A/T > Component Information > Service and Repair > Page 2974 10. Grasp firmly while pulling down with a twisting motion in order to remove the filter. 11. Remove the filter seal. The filter seal may be stuck in the pump; if necessary, carefully use pliers or another suitable tool to remove the seal. 12. Discard the seal. 13. Inspect the fluid color. 14. Inspect the filter. Pry the metal crimping away from the top of the filter and pull apart. The filter may contain the following evidence for root cause diagnosis: ^ Clutch material ^ Bronze slivers indicating bushing wear ^ Steel particles 15. Clean the transmission case and the oil pan gasket surfaces with solvent, and air dry. You must remove all traces of the old gasket material. Installation Procedure 1. Coat the new filter seal with automatic transmission fluid. 2. Install the new filter seal into the transmission case. Tap the seal into place using a suitable size socket. 3. Install the new filter into the case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Fluid Filter - A/T > Component Information > Service and Repair > Page 2975 4. Install the oil pan and a new gasket. 5. Install the oil pan bolts. Tighten the oil pan to transmission case bolts alternately and evenly to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. If previously removed, install the range selector cable bracket and bolts. Tighten the bolts to 25 Nm (18 ft. lbs.). 7. Apply a small amount of sealant GM P/N 12346004 to the threads of the oil pan drain plug, if equipped. 8. Install the oil pan drain plug, if equipped. Tighten the oil pan drain plug to 18 Nm (13 ft. lbs.). 9. Lower the vehicle. 10. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Refer to Transmission Fluid Checking Procedure and Fluid Capacity Specifications. 11. Check the COLD fluid level reading for initial fill only. 12. Inspect the oil pan gasket for leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure Fuel Pressure Release: Service and Repair Fuel Pressure Relief Procedure FUEL PRESSURE RELIEF PROCEDURE TOOLS REQUIRED J 34730-1A Fuel Pressure Gage 1. Disconnect the negative battery cable. 2. Install J 34730-1A. 3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure. 4. Open the valve on J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing. 5. Drain any fuel remaining in the gage into an approved container. 6. Once the system pressure is completely relieved, remove J 34730-1A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure > Page 2981 Fuel Pressure Release: Service and Repair Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Fuel Pump Pickup Filter > Component Information > Description and Operation Fuel Pump Pickup Filter: Description and Operation FUEL STRAINER The fuel strainer attaches to the lower end of the fuel sender. The fuel strainer is made of woven plastic. The functions of the fuel strainer are to filter contaminants and to wick fuel. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Oil Filter, Engine > Component Information > Technical Service Bulletins > Engine - Noise/Damage Oil Filter Application Importance Oil Filter: Technical Service Bulletins Engine - Noise/Damage Oil Filter Application Importance INFORMATION Bulletin No.: 07-06-01-016B Date: July 27, 2009 Subject: Information on Internal Engine Noise or Damage After Oil Filter Replacement Models: 2010 and Prior Passenger Cars and Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being updated to add model years. Please discard Corporate Bulletin Number 07-06-01-016A (Section 06 - Engine/Propulsion System). Important Engine damage that is the result of an incorrect or improperly installed engine oil filter is not a warrantable claim. The best way to avoid oil filter quality concerns is to purchase ACDelco(R) oil filters directly from GMSPO. Oil filter misapplication may cause abnormal engine noise or internal damage. Always utilize the most recent parts information to ensure the correct part number filter is installed when replacing oil filters. Do not rely on physical dimensions alone. Counterfeit copies of name brand parts have been discovered in some aftermarket parts systems. Always ensure the parts you install are from a trusted source. Improper oil filter installation may result in catastrophic engine damage. Refer to the appropriate Service Information (SI) installation instructions when replacing any oil filter and pay particular attention to procedures for proper cartridge filter element alignment. If the diagnostics in SI (Engine Mechanical) lead to the oil filter as the cause of the internal engine noise or damage, dealers should submit a field product report. Refer to Corporate Bulletin Number 02-00-89-002I (Information for Dealers on How to Submit a Field Product Report). Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Oil Filter, Engine > Component Information > Technical Service Bulletins > Page 2989 Oil Filter: Service and Repair Engine Oil and Oil Filter Replacement Removal Procedure Important: In order to completely drain the oil from the oil pan internal baffling, the bottom of the oil pan must be level during the oil drain procedure. 1. Open the hood. 2. Remove the intake manifold sight shield. 3. Remove the oil fill cap. 4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. 5. Position a suitable drain pan under the oil pan drain plug. 6. Remove the oil pan drain plug. 7. Allow the oil to drain completely. 8. Clean and inspect the oil pan drain plug, replace if necessary. 9. Clean and inspect the oil pan drain plug sealing surface, replace the oil pan if necessary. 10. Wipe any remaining oil from the drain plug hole and reinstall the oil pan drain plug until snug. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Oil Filter, Engine > Component Information > Technical Service Bulletins > Page 2990 11. Position a suitable drain pan under the oil filter. 12. Remove the oil filter. 13. Ensure that the oil filter gasket is still on the old filter, if not remove the oil filter gasket from the oil pan. Installation Procedure 1. Apply clean engine oil to the NEW oil filter gasket. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the NEW oil filter. ^ Tighten the filter to 30 Nm (22 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Filters > Oil Filter, Engine > Component Information > Technical Service Bulletins > Page 2991 3. Tighten the oil drain plug. ^ Tighten the drain plug to 25 Nm (18 ft. lbs.). 4. Remove the oil drain pan from under the vehicle. 5. Lower the vehicle. 6. Fill the crankcase with new engine oil. Refer to Capacities - Approximate Fluid and Fluid and Lubricant Recommendations. 7. Start the engine. 8. Inspect for oil leaks after engine start up. 9. Turn off the engine and allow the oil a few minutes to drain back into the oil pan. 10. Remove the oil level indicator from the oil indicator tube. 11. Clean off the indicator end of the oil level indicator with a clean paper towel or cloth. 12. Install the oil level indicator into the oil level indicator tube until the oil level indicator handle contacts the top of the oil level indicator tube. 13. Again, remove the oil level indicator from the oil level indicator tube keeping the tip of the oil level indicator down. 14. Check the level of the engine oil on the oil level indicator. 15. If necessary, adjust the oil level by adding or draining oil. 16. Check for oil leaks. 17. Install the intake manifold sight shield. 18. Close the hood. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) Heater Hose: Service and Repair Heater Hose - Inlet (Front System Only) HEATER HOSE REPLACEMENT - INLET (FRONT SYSTEM ONLY) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - GE-47622 Hose Clamp Pliers REMOVAL PROCEDURE 1. Drain the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 2. Using the J 43181 , disconnect the inlet heater hose (2) from the heater core inlet tube. 1. Install the J 43181 to the quick connect on the outlet heater core hose (2). 2. Close the tool around the inlet heater core hose. 3. Firmly pull the tool into the quick connect end of the heater hose. 4. Firmly grasp the heater hose (2). Pull the heater hose forward in order to disengage the hose from the heater core. 3. Position the inlet heater hose clamp (1) at the engine block using GE-47622 . 4. Remove the heater inlet hose (2) from the inlet hose fitting at the engine block. 5. Remove the heater inlet hose. INSTALLATION PROCEDURE 1. Apply coolant to the end of the heater inlet hose. 2. Install the heater inlet hose (2) to the inlet hose fitting at the engine block. IMPORTANT: When installing a new heater inlet hose, place the clamps on the hose before installing the hose to the inlet hose fitting at the engine block. 3. Position the inlet heater hose clamp (1) at the engine block using GE-47622 . 4. Install the quick connect end of the outlet heater core hose (2) to the heater core. 5. Fill the engine cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 2997 Heater Hose: Service and Repair Heater Hose - Inlet (Auxiliary System) HEATER HOSE REPLACEMENT - INLET (AUXILIARY SYSTEM) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - J 38185 Hose Clamp Pliers REMOVAL PROCEDURE 1. Drain the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 2. Remove the coolant recovery reservoir. 3. Using the J 43181 disconnect the inlet heater hose (2) from the heater core inlet tube. 1. Install the J 43181 to the quick connect on the outlet heater core hose (2). 2. Close the tool around the inlet heater core hose. 3. Firmly pull the tool into the quick connect end of the heater hose. 4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core. 4. Reposition the hose clamp at the engine outlet using J 38185. 5. Remove the heater inlet hose (4) from the engine block. 6. Remove the nut retaining the coolant bypass valve to the cowl. 7. Remove the heater inlet hose. INSTALLATION PROCEDURE 1. Apply coolant to the end of the heater inlet hoses. 2. Install the heater inlet hose to the inlet hose fitting at the engine block. IMPORTANT: When installing a new heater inlet hose, place the clamps on the hose before installing the hose to the inlet hose fitting at the engine block. 3. Install the nut retaining the coolant bypass valve to the cowl. Tighten the nut to 10 N.m(89 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 4. Install the inlet heater hose to the engine block. 5. Reposition the inlet heater hose clamp at the engine block using J 38185. 6. Install the quick connect end of the inlet heater core hose to the heater core. 7. Install the coolant recovery reservoir. 8. Fill the engine cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 2998 Heater Hose: Service and Repair Heater Hose - Outlet (Short Wheel Base) HEATER HOSE REPLACEMENT - OUTLET (SHORT WHEEL BASE) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - J 38185 Hose Clamp Pliers REMOVAL PROCEDURE 1. Drain the cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2). 2. Remove the transmission. 3. Remove the generator. 4. Using the J 43181 disconnect the outlet hose from the heater core outlet tube (1). 1. Install the J 43181 to the outlet heater core hose. 2. Close the tool around the outlet heater core hose. 3. Firmly pull the tool into the quick connect end of the heater hose. 4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core. 5. Remove the heater outlet hose (3) from the heater core (1). 6. Position the outlet heater hose clamp (6) at the water pump using J 38185. 7. Remove the heater outlet hose (7) from the outlet hose fitting. 8. Remove the heater outlet hose. INSTALLATION PROCEDURE 1. Install the outlet heater hose. 2. Install the heater outlet hose (7) to the outlet hose fitting. 3. Position the outlet heater hose clamp (6) at the outlet hose fitting using J 38185. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 2999 4. Install the heater outlet hose (3) to the heater core (1). 5. Firmly push the quick connect onto the heater core hose until you hear an audible click. 6. Install the transmission. 7. Install the generator. 8. Fill the cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 3000 Heater Hose: Service and Repair Heater Hose - Outlet (Long Wheel Base) HEATER HOSE REPLACEMENT - OUTLET (LONG WHEEL BASE) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - J 38185 Hose Clamp Pliers REMOVAL PROCEDURE 1. Remove the coolant bypass valve. 2. Remove the transmission. 3. Remove the heater outlet hose (3) from the heater core (1). 4. Position the outlet heater hose clamp (6) at the water pump using J 38185. 5. Remove the heater outlet hose (7) from the outlet hose fitting. 6. Remove the heater outlet hose. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 3001 1. Install the outlet heater hose. 2. Install the heater outlet hose (7) to the outlet hose fitting. 3. Position the outlet heater hose clamp (6) at the outlet hose fitting using J 38185. 4. Install the heater outlet hose (3) to the heater core (1). 5. Firmly push the quick connect onto the heater core hose until you hear an audible click. 6. Install the transmission. 7. Install the coolant bypass valve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 3002 Heater Hose: Service and Repair Heater and Air Conditioning (A/C) Pipe/Repair - Auxiliary HEATER AND AIR CONDITIONING (A/C) PIPE REPLACEMENT/REPAIR - AUXILIARY TOOLS REQUIRED J 41425 A/C Line Repair Kit Do not service the rear A/C or heater lines as a complete unit. Service the rear A/C or heater lines as a sectional repair. Replacement lines can be obtained through GMSPO. Use the J 41425 when any of the following actions damage the rear A/C or heater lines: Rub-through - Collision damage - Leakage in the system MINIMUM TUBE LENGTH REQUIRED TABLE IMPORTANT: When sectioning the rear A/C or heater lines, ensure that the correct minimum length remains in the straight part of the line on both sides of the splice. Follow the Straight Line Repair procedure in order to repair line damage in a straight section of line. Follow the Line Sectioning Repair procedure in order to repair any damage in a bend area. Do not repair the rear A/C or heater lines in a bend area, replace the lines. Maintaining the original line shape will prevent vibrations and rub-through. STRAIGHT LINE REPAIR 1. Recover the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. 2. Drain the coolant, if repairing the heater lines. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 3. Raise and support the vehicle. Refer to Vehicle Lifting. 4. Locate the area that requires repair. 5. Obtain a length of replacement line to make the repair. 6. Use a tubing cutter in order to cut and remove the section of damaged line. 7. Use a tubing cutter in order to cut the replacement line to length. IMPORTANT: The length of the replacement line must be the same as the section being replaced. 8. Use the cleaning pad from the J 41425 in order to clean any burrs or grease from the line ends. Be sure to clean at least 19 mm (0.75 in) from the line splice area. 9. Use the LOK prep sealant in order to prep the line ends. 10. Apply one drop of the J 41425-3 sealing compound to the outside of each end of the line. 11. Insert the line ends into the LOK fitting. 12. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines. 13. Install the correct LOK fitting jaws into the J 41425-1 tool. 14. Install the J 41425-1 tool over the LOK connectors.Verify that the LOK connector ends are positioned in the counter bores of the jaws. 15. Tighten the forcing screw of the J 41425-1 tool.When fully seated, the LOK connector collars will bottom out on the center shoulder of the LOK fitting. IMPORTANT: Hold the J 41425-1 tool body with a 3/8" breaker bar. 16. Loosen the forcing screw and remove the J 41425-1 tool from the repaired line. 17. Repeat Step 8 through Step 16 to complete the line splice. 18. Verify that the LOK fittings are correctly installed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 3003 19. Lower the vehicle. 20. Refill the coolant, if drained. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 21. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. LINE SECTIONING REPAIR 1. Recover the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. 2. Drain the coolant, if repairing the heater lines. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 3. Raise and support the vehicle. Refer to Vehicle Lifting. 4. Obtain a new A/C or heater line for sectioning. 5. Scribe a mark on the line that will be sectioned. IMPORTANT: Stagger the splices if repairing more than one line. 6. Use a tubing cutter in order to cut the line or lines being replaced. 7. Remove the section of line being replaced from the vehicle. 8. Install the replacement line to the vehicle. IMPORTANT: The length of the replacement line must be the same as the line being replaced. 9. Use a tubing cutter in order to cut the replacement line to length. 10. Use the cleaning pad from the J 41425 in order to clean any burrs or grease. Be sure to clean at least 19 mm (0.75 in) from the line splice area. 11. Use the LOK prep sealant in order to prep the line ends. 12. Apply one drop of the J 41425-3 sealing compound to the outside of each line end. 13. Insert the line ends into the LOK fitting. 14. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines. 15. Install the correct LOK fitting jaws into the J 41425-1 tool. 16. Install the J 41425-1 tool over the LOK connectors.Verify that the LOK connector ends are positioned in the counter bores of the jaws. 17. Hold the tool body with a 3/8" breaker bar. Turn the forcing screw until both of the connector collars bottom on the center shoulder of the LOK fitting. 18. Loosen the forcing screw. Remove the tool from the repaired line. 19. Verify that the LOK fitting is correctly installed. 20. Lower the vehicle. 21. Refill the coolant, if drained. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 22. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Hose/Line HVAC > Component Information > Service and Repair > Compressor Hose Assembly Replacement Hose/Line HVAC: Service and Repair Compressor Hose Assembly Replacement COMPRESSOR HOSE ASSEMBLY REPLACEMENT TOOLS REQUIRED J 39400-A Halogen Leak Detector REMOVAL PROCEDURE 1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging. 2. Remove the washer bottle. 3. Remove the retaining nut (1) from the compressor hose (4) at the accumulator (2). 4. Remove the retaining nut from the compressor hose at the auxiliary HVAC piping connection (3). 5. Remove the compressor hose from the accumulator (2). 6. Remove the compressor hose from the auxiliary HVAC piping. 7. Disconnect the pressure sensor electrical connector. 8. Remove the compressor hose mounting nut from the A/C compressor. 9. Remove the heater hose bracket nut at the engine. 10. Remove the bracket from the stud. 11. Turn the compressor hose assembly to clear the heat shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Hose/Line HVAC > Component Information > Service and Repair > Compressor Hose Assembly Replacement > Page 3008 12. Lift and remove the compressor hose assembly from the compressor. 13. Remove the compressor hose assembly from the condenser. 14. Remove the compressor hose assembly. 15. Remove the compressor hose from the A/C compressor. 16. Remove the compressor hose from the condenser. 17. Disconnect the electrical connector from the A/C low pressure switch. 18. Remove the nut from the compressor hose at the accumulator. 19. Remove the compressor hose from the accumulator. 20. Remove the compressor hose from the vehicle. 21. Discard all of the used sealing washers. Cap the system openings. INSTALLATION PROCEDURE 1. Install the compressor hose assembly. 2. Install the compressor hose to the condenser using new sealing washers. 3. Install the compressor hose nut to the condenser. Tighten the nut to 16 N.m (12 lb ft). NOTE: Refer to Fastener Notice. 4. Connect the electrical connector to the A/C low pressure switch. 5. Install the compressor hose to the accumulator using new sealing washers. 6. Install the nut (1) to the accumulator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Hose/Line HVAC > Component Information > Service and Repair > Compressor Hose Assembly Replacement > Page 3009 Tighten the nut to 16 N.m (12 lb ft). 7. Install the compressor hose to the A/C compressor using new sealing washers. 8. Install the compressor hose nut. Tighten the nut to 16 N.m (12 lb ft). 9. Install the washer bottle. 10. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging. 11. Leak test the fittings of the component using J 39400-A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Hose/Line HVAC > Component Information > Service and Repair > Compressor Hose Assembly Replacement > Page 3010 Hose/Line HVAC: Service and Repair Evaporator Tube Replacement EVAPORATOR TUBE REPLACEMENT TOOLS REQUIRED - J 26549-E Orifice Tube Remover - J 39400-A Halogen Leak Detector REMOVAL PROCEDURE 1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging. 2. Loosen the evaporator tube (5) from the evaporator. 3. Loosen the auxiliary evaporator tube (7) from the auxiliary piping. 4. Remove the evaporator tube nut from the condenser. 5. Remove the nuts (1,2) retaining the evaporator tube to the fender. 6. Remove the washer solvent container. 7. Remove the coolant recovery tank. 8. Remove the evaporator tube using J 26549-E. 9. Remove the O-ring seal and discard. INSTALLATION PROCEDURE 1. Install the new O-ring seal. 2. Install the evaporator tube. 3. Connect the evaporator tube to the evaporator (5). Tighten the nut to 28 N.m (21 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Hose/Line HVAC > Component Information > Service and Repair > Compressor Hose Assembly Replacement > Page 3011 NOTE: Refer to Fastener Notice in Service Precautions. 4. Connect the auxiliary evaporator tube to the auxiliary piping. Tighten the nut to 28 N.m (21 lb ft). 5. Connect the evaporator tube to the condenser. Tighten the nut to 28 N.m (21 lb ft). 6. Install the coolant recovery tank. 7. Install the washer solvent container. 8. Install the nuts (1,2) retaining the evaporator tube to the fender. Tighten the nuts to 28 N.m (21 lb ft). 9. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging. 10. Leak test the fittings of the components using the J 39400-A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures Technical Service Bulletin # 05086A Date: 051116 Recall - Power Steering Hose Fractures Product Safety - Power Steering Hose Fracture # 05086A - (Nov 16, 2005) Models: 2006 BUICK RAINIER 2006 CADILLAC ESCALADE 2005 CHEVROLET CORVETTE, SILVERADO 2006 CHEVROLET CORVETTE, EXPRESS, SILVERADO, TAHOE, TRAILBLAZER, TRAILBLAZER EXT 2005 GMC SIERRA 2006 GMC ENVOY, ENVOY XL, SAVANA, SIERRA, YUKON 2006 HUMMER H2 ALSO USED AS A SERVICE PART (18 PART NUMBERS INVOLVED) This bulletin is being revised to address hoses used to service 1991-2006 vehicles. Dealers who ordered these hoses for service are identified in the attachment contained in the Administrative Message (U.S.) or Dealer Communication (Canada). Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles. Some of these vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with hydro-boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. Note: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991-2006 vehicles. Correction Dealers are to inspect the power steering hose(s) for two suspect date codes and replace them if required. Dealers who have ordered the involved hoses for service (see listing in Administrative Message) are to search their part sales records to determine the name and address of the purchaser(s). If the purchaser is the owner of the vehicle, dealers are to send the owner a copy of the appropriate letter shown in this bulletin requesting them to bring their vehicle in for repair. If the purchaser is a body shop, independent repair shop, etc., dealers are to send the shop a copy of the appropriate letter shown in this bulletin requesting that they provide the customer's name, address, and telephone number so the dealer can send the owner a copy of the letter. Vehicles Involved Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3020 Involved are certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles built within the VIN breakpoints shown. Important: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991 - 2006 vehicles. Affected dealers have already been issued a Special Return Bulletin to return any shelf stock, refer to Administrative Message VSU20050801 - GMP05 -157. Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) prior to beginning recall repairs. [Not all vehicles within the above breakpoints may be involved.] For US and Canada For dealers involved vehicles, a Campaign Initiation Detail Report (CIDR) containing the complete vehicle identification number, customer name and address data has been prepared and will be loaded to the GM DealerWorld (US) Recall Information, GMinfoNet (Canada) Recall Reports. Dealers will not have a report available if they have no involved vehicles currently assigned. Dealers that have ordered involved hoses for service will also be listed in the report contained in the Administrative Message. For Export For dealers with involved vehicles, a Campaign Initiation Detail Report containing the complete vehicle identification number, customer name and address data has been prepared, and is being furnished to involved dealers. Dealers will not receive a report with the recall bulletin if they have no involved vehicles currently assigned. The Campaign Initiation Detail Report may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this recall. Parts Information Less than 10% of the involved vehicles will require hose replacement. If parts are required, order the appropriate hose(s) from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order. Claim Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3021 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3022 Submit a Product Recall claim with the information shown. Courtesy Transportation - For US and Canada The General Motors Courtesy Transportation Program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranty. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product recall is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for courtesy transportation guidelines. Customer Notification - For US and Canada General Motors will notify customers of this recall on their vehicle (see copy of customer letter shown in this bulletin). For vehicles with the recalled component installed on their vehicles outside of warranty, dealers are to notify customers of this recall using a copy of the letter shown in this bulletin. Customer Notification - For Export Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the sample letter. Dealer Recall Responsibility - For US and Export (US States, Territories, and Possession The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the recall is not completed within a reasonable time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3023 Dealer Recall Responsibility - All All unsold new vehicles in dealers' possession and subject to this recall must be held and inspected/repaired per the service procedure of this recall bulletin before customers take possession of these vehicles. Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is shown in this bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. In summary, whenever a vehicle subject to this recall enters your vehicle inventory, or is in your dealership for service in the future, you must take the steps necessary to be sure the recall correction has been made before selling or releasing the vehicle. Following this customer letter is another letter for customers identified through dealer search retype this letter and insert the appropriate information. Disclaimer Service Procedure Inspection Procedure 1. Inspect and record the power steering pressure line for the date code as shown above. The date code is printed on the hose and is repeated approximately every 6 inches (150 mm). Depending on the vehicle configuration, there may be one or two hoses to inspect. Vehicles equipped with the hydro-boost system will have two hoses while others will only have one hose. Removal of conduit may be necessary in order to inspect the date code. 2. Rainier/TrailBlazer/TrailBlazer EXT/Envoy/Envoy XL with 4.2L Engine Power Steering Pressure Hose (1). This pressure line has two hose sections and both must be inspected. Vehicle may need to be lifted to inspect both. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3024 3. Express/Savana Steering Pump to Hydro-Boost Pressure Line (2). 4. Express/Savana Hydro-Boost to Steering Gear Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3025 5. Silverado/Tahoe/Sierra/Yukon/Escalade Non Hydro-Boost Pressure Line (3). 6. Silverado/Tahoe/Sierra/Yukon/Escalade Power Steering Pump to Hydro-Boost Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3026 7. Silverado/Tahoe/Sierra/Yukon/Escalade Hydro-Boost to Steering Gear Pressure Line (1). 8. Hummer H2 Power Steering Pump to Hydro-Boost Pressure Line. 9. Hummer H2 Hydro-Boost to Steering Gear Pressure Line. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3027 10. Corvette Power Steering Pressure Hose (2). The vehicle will need to be lifted on a hoist for inspection. Removal of the power steering cooler bolts will give increased access to the pressure hose. 11. Compare the date code on the hose(s) to the suspect date codes shown. - If the date code is one of the codes listed, the hose(s) must be replaced. Proceed to the Hose Replacement Procedure. - If the date code is not one of the codes shown, then replace the conduit if applicable and no further action is required. Hose Replacement Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3028 If the inspection reveals that the hose needs to be replaced, follow the instructions in SI. Shown are the SI document numbers. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3029 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3030 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3031 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3032 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3033 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > Recalls: > NHTSA05V455000 > Oct > 05 > Recall 05V455000: Power Steering Hose Fracturing Power Steering Line/Hose: Recalls Recall 05V455000: Power Steering Hose Fracturing MAKE/MODELS: MODEL/BUILD YEARS: Buick/Rainier 2006 Cadillac/Escalade 2006 Chevrolet/Corvette 2005-2006 Chevrolet/Express 2006 Chevrolet/Silverado 2005-2006 Chevrolet/Tahoe 2006 Chevrolet/Trailblazer 2006 Chevrolet/Trailblazer EXT 2006 GMC/Envoy 2006 GMC/Envoy XL 2006 GMC/Savana 2006 GMC/Sierra 2005-2006 GMC/Yukon 2006 Hummer/H2 2006 Isuzu/Ascender 2006 MANUFACTURER: General Motors Corp. NHTSA CAMPAIGN ID NUMBER: 05V455000 MFG'S REPORT DATE: October 04, 2005 COMPONENT: Steering: Hydraulic Power Assist: Hose, Piping, and Connections POTENTIAL NUMBER OF UNITS AFFECTED: 123592 SUMMARY: Certain passenger vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. CONSEQUENCE: If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with Hydro-Boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. REMEDY: Dealers will inspect the power steering hose(s) for two suspect date codes and replace them if required. The recall will begin on October 14, 2005. Owners should contact Chevrolet at 1-800-630-2438, GMC at 1-866-996-9463, Buick at 1-866-608-8080, Cadillac at 1-866-982-2339, Isuzu at 1-800-255-6727, or HUMMER at 1-800-732-5493. NOTES: GM recall No. 05086. Customers can also contact The National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to http://www.safercar.gov. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures Technical Service Bulletin # 05086A Date: 051116 Recall - Power Steering Hose Fractures Product Safety - Power Steering Hose Fracture # 05086A - (Nov 16, 2005) Models: 2006 BUICK RAINIER 2006 CADILLAC ESCALADE 2005 CHEVROLET CORVETTE, SILVERADO 2006 CHEVROLET CORVETTE, EXPRESS, SILVERADO, TAHOE, TRAILBLAZER, TRAILBLAZER EXT 2005 GMC SIERRA 2006 GMC ENVOY, ENVOY XL, SAVANA, SIERRA, YUKON 2006 HUMMER H2 ALSO USED AS A SERVICE PART (18 PART NUMBERS INVOLVED) This bulletin is being revised to address hoses used to service 1991-2006 vehicles. Dealers who ordered these hoses for service are identified in the attachment contained in the Administrative Message (U.S.) or Dealer Communication (Canada). Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles. Some of these vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with hydro-boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. Note: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991-2006 vehicles. Correction Dealers are to inspect the power steering hose(s) for two suspect date codes and replace them if required. Dealers who have ordered the involved hoses for service (see listing in Administrative Message) are to search their part sales records to determine the name and address of the purchaser(s). If the purchaser is the owner of the vehicle, dealers are to send the owner a copy of the appropriate letter shown in this bulletin requesting them to bring their vehicle in for repair. If the purchaser is a body shop, independent repair shop, etc., dealers are to send the shop a copy of the appropriate letter shown in this bulletin requesting that they provide the customer's name, address, and telephone number so the dealer can send the owner a copy of the letter. Vehicles Involved Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3047 Involved are certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles built within the VIN breakpoints shown. Important: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991 - 2006 vehicles. Affected dealers have already been issued a Special Return Bulletin to return any shelf stock, refer to Administrative Message VSU20050801 - GMP05 -157. Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) prior to beginning recall repairs. [Not all vehicles within the above breakpoints may be involved.] For US and Canada For dealers involved vehicles, a Campaign Initiation Detail Report (CIDR) containing the complete vehicle identification number, customer name and address data has been prepared and will be loaded to the GM DealerWorld (US) Recall Information, GMinfoNet (Canada) Recall Reports. Dealers will not have a report available if they have no involved vehicles currently assigned. Dealers that have ordered involved hoses for service will also be listed in the report contained in the Administrative Message. For Export For dealers with involved vehicles, a Campaign Initiation Detail Report containing the complete vehicle identification number, customer name and address data has been prepared, and is being furnished to involved dealers. Dealers will not receive a report with the recall bulletin if they have no involved vehicles currently assigned. The Campaign Initiation Detail Report may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this recall. Parts Information Less than 10% of the involved vehicles will require hose replacement. If parts are required, order the appropriate hose(s) from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order. Claim Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3048 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3049 Submit a Product Recall claim with the information shown. Courtesy Transportation - For US and Canada The General Motors Courtesy Transportation Program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranty. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product recall is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for courtesy transportation guidelines. Customer Notification - For US and Canada General Motors will notify customers of this recall on their vehicle (see copy of customer letter shown in this bulletin). For vehicles with the recalled component installed on their vehicles outside of warranty, dealers are to notify customers of this recall using a copy of the letter shown in this bulletin. Customer Notification - For Export Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the sample letter. Dealer Recall Responsibility - For US and Export (US States, Territories, and Possession The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the recall is not completed within a reasonable time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3050 Dealer Recall Responsibility - All All unsold new vehicles in dealers' possession and subject to this recall must be held and inspected/repaired per the service procedure of this recall bulletin before customers take possession of these vehicles. Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is shown in this bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. In summary, whenever a vehicle subject to this recall enters your vehicle inventory, or is in your dealership for service in the future, you must take the steps necessary to be sure the recall correction has been made before selling or releasing the vehicle. Following this customer letter is another letter for customers identified through dealer search retype this letter and insert the appropriate information. Disclaimer Service Procedure Inspection Procedure 1. Inspect and record the power steering pressure line for the date code as shown above. The date code is printed on the hose and is repeated approximately every 6 inches (150 mm). Depending on the vehicle configuration, there may be one or two hoses to inspect. Vehicles equipped with the hydro-boost system will have two hoses while others will only have one hose. Removal of conduit may be necessary in order to inspect the date code. 2. Rainier/TrailBlazer/TrailBlazer EXT/Envoy/Envoy XL with 4.2L Engine Power Steering Pressure Hose (1). This pressure line has two hose sections and both must be inspected. Vehicle may need to be lifted to inspect both. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3051 3. Express/Savana Steering Pump to Hydro-Boost Pressure Line (2). 4. Express/Savana Hydro-Boost to Steering Gear Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3052 5. Silverado/Tahoe/Sierra/Yukon/Escalade Non Hydro-Boost Pressure Line (3). 6. Silverado/Tahoe/Sierra/Yukon/Escalade Power Steering Pump to Hydro-Boost Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3053 7. Silverado/Tahoe/Sierra/Yukon/Escalade Hydro-Boost to Steering Gear Pressure Line (1). 8. Hummer H2 Power Steering Pump to Hydro-Boost Pressure Line. 9. Hummer H2 Hydro-Boost to Steering Gear Pressure Line. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3054 10. Corvette Power Steering Pressure Hose (2). The vehicle will need to be lifted on a hoist for inspection. Removal of the power steering cooler bolts will give increased access to the pressure hose. 11. Compare the date code on the hose(s) to the suspect date codes shown. - If the date code is one of the codes listed, the hose(s) must be replaced. Proceed to the Hose Replacement Procedure. - If the date code is not one of the codes shown, then replace the conduit if applicable and no further action is required. Hose Replacement Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3055 If the inspection reveals that the hose needs to be replaced, follow the instructions in SI. Shown are the SI document numbers. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3056 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3057 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3058 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3059 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3060 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 07-08-52-003 > Sep > 07 > Recalls for Power Steering Line/Hose: > NHTSA05V455000 > Oct > 05 > Recall 05V455000: Power Steering Hose Fracturing Power Steering Line/Hose: Recalls Recall 05V455000: Power Steering Hose Fracturing MAKE/MODELS: MODEL/BUILD YEARS: Buick/Rainier 2006 Cadillac/Escalade 2006 Chevrolet/Corvette 2005-2006 Chevrolet/Express 2006 Chevrolet/Silverado 2005-2006 Chevrolet/Tahoe 2006 Chevrolet/Trailblazer 2006 Chevrolet/Trailblazer EXT 2006 GMC/Envoy 2006 GMC/Envoy XL 2006 GMC/Savana 2006 GMC/Sierra 2005-2006 GMC/Yukon 2006 Hummer/H2 2006 Isuzu/Ascender 2006 MANUFACTURER: General Motors Corp. NHTSA CAMPAIGN ID NUMBER: 05V455000 MFG'S REPORT DATE: October 04, 2005 COMPONENT: Steering: Hydraulic Power Assist: Hose, Piping, and Connections POTENTIAL NUMBER OF UNITS AFFECTED: 123592 SUMMARY: Certain passenger vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. CONSEQUENCE: If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with Hydro-Boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. REMEDY: Dealers will inspect the power steering hose(s) for two suspect date codes and replace them if required. The recall will begin on October 14, 2005. Owners should contact Chevrolet at 1-800-630-2438, GMC at 1-866-996-9463, Buick at 1-866-608-8080, Cadillac at 1-866-982-2339, Isuzu at 1-800-255-6727, or HUMMER at 1-800-732-5493. NOTES: GM recall No. 05086. Customers can also contact The National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to http://www.safercar.gov. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures Technical Service Bulletin # 05086A Date: 051116 Recall - Power Steering Hose Fractures Product Safety - Power Steering Hose Fracture # 05086A - (Nov 16, 2005) Models: 2006 BUICK RAINIER 2006 CADILLAC ESCALADE 2005 CHEVROLET CORVETTE, SILVERADO 2006 CHEVROLET CORVETTE, EXPRESS, SILVERADO, TAHOE, TRAILBLAZER, TRAILBLAZER EXT 2005 GMC SIERRA 2006 GMC ENVOY, ENVOY XL, SAVANA, SIERRA, YUKON 2006 HUMMER H2 ALSO USED AS A SERVICE PART (18 PART NUMBERS INVOLVED) This bulletin is being revised to address hoses used to service 1991-2006 vehicles. Dealers who ordered these hoses for service are identified in the attachment contained in the Administrative Message (U.S.) or Dealer Communication (Canada). Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles. Some of these vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with hydro-boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. Note: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991-2006 vehicles. Correction Dealers are to inspect the power steering hose(s) for two suspect date codes and replace them if required. Dealers who have ordered the involved hoses for service (see listing in Administrative Message) are to search their part sales records to determine the name and address of the purchaser(s). If the purchaser is the owner of the vehicle, dealers are to send the owner a copy of the appropriate letter shown in this bulletin requesting them to bring their vehicle in for repair. If the purchaser is a body shop, independent repair shop, etc., dealers are to send the shop a copy of the appropriate letter shown in this bulletin requesting that they provide the customer's name, address, and telephone number so the dealer can send the owner a copy of the letter. Vehicles Involved Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3075 Involved are certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles built within the VIN breakpoints shown. Important: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991 - 2006 vehicles. Affected dealers have already been issued a Special Return Bulletin to return any shelf stock, refer to Administrative Message VSU20050801 - GMP05 -157. Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) prior to beginning recall repairs. [Not all vehicles within the above breakpoints may be involved.] For US and Canada For dealers involved vehicles, a Campaign Initiation Detail Report (CIDR) containing the complete vehicle identification number, customer name and address data has been prepared and will be loaded to the GM DealerWorld (US) Recall Information, GMinfoNet (Canada) Recall Reports. Dealers will not have a report available if they have no involved vehicles currently assigned. Dealers that have ordered involved hoses for service will also be listed in the report contained in the Administrative Message. For Export For dealers with involved vehicles, a Campaign Initiation Detail Report containing the complete vehicle identification number, customer name and address data has been prepared, and is being furnished to involved dealers. Dealers will not receive a report with the recall bulletin if they have no involved vehicles currently assigned. The Campaign Initiation Detail Report may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this recall. Parts Information Less than 10% of the involved vehicles will require hose replacement. If parts are required, order the appropriate hose(s) from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order. Claim Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3076 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3077 Submit a Product Recall claim with the information shown. Courtesy Transportation - For US and Canada The General Motors Courtesy Transportation Program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranty. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product recall is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for courtesy transportation guidelines. Customer Notification - For US and Canada General Motors will notify customers of this recall on their vehicle (see copy of customer letter shown in this bulletin). For vehicles with the recalled component installed on their vehicles outside of warranty, dealers are to notify customers of this recall using a copy of the letter shown in this bulletin. Customer Notification - For Export Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the sample letter. Dealer Recall Responsibility - For US and Export (US States, Territories, and Possession The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the recall is not completed within a reasonable time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3078 Dealer Recall Responsibility - All All unsold new vehicles in dealers' possession and subject to this recall must be held and inspected/repaired per the service procedure of this recall bulletin before customers take possession of these vehicles. Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is shown in this bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. In summary, whenever a vehicle subject to this recall enters your vehicle inventory, or is in your dealership for service in the future, you must take the steps necessary to be sure the recall correction has been made before selling or releasing the vehicle. Following this customer letter is another letter for customers identified through dealer search retype this letter and insert the appropriate information. Disclaimer Service Procedure Inspection Procedure 1. Inspect and record the power steering pressure line for the date code as shown above. The date code is printed on the hose and is repeated approximately every 6 inches (150 mm). Depending on the vehicle configuration, there may be one or two hoses to inspect. Vehicles equipped with the hydro-boost system will have two hoses while others will only have one hose. Removal of conduit may be necessary in order to inspect the date code. 2. Rainier/TrailBlazer/TrailBlazer EXT/Envoy/Envoy XL with 4.2L Engine Power Steering Pressure Hose (1). This pressure line has two hose sections and both must be inspected. Vehicle may need to be lifted to inspect both. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3079 3. Express/Savana Steering Pump to Hydro-Boost Pressure Line (2). 4. Express/Savana Hydro-Boost to Steering Gear Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3080 5. Silverado/Tahoe/Sierra/Yukon/Escalade Non Hydro-Boost Pressure Line (3). 6. Silverado/Tahoe/Sierra/Yukon/Escalade Power Steering Pump to Hydro-Boost Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3081 7. Silverado/Tahoe/Sierra/Yukon/Escalade Hydro-Boost to Steering Gear Pressure Line (1). 8. Hummer H2 Power Steering Pump to Hydro-Boost Pressure Line. 9. Hummer H2 Hydro-Boost to Steering Gear Pressure Line. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3082 10. Corvette Power Steering Pressure Hose (2). The vehicle will need to be lifted on a hoist for inspection. Removal of the power steering cooler bolts will give increased access to the pressure hose. 11. Compare the date code on the hose(s) to the suspect date codes shown. - If the date code is one of the codes listed, the hose(s) must be replaced. Proceed to the Hose Replacement Procedure. - If the date code is not one of the codes shown, then replace the conduit if applicable and no further action is required. Hose Replacement Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3083 If the inspection reveals that the hose needs to be replaced, follow the instructions in SI. Shown are the SI document numbers. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3084 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3085 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3086 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3087 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3088 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > Recalls for Power Steering Line/Hose: > NHTSA05V455000 > Oct > 05 > Recall 05V455000: Power Steering Hose Fracturing Power Steering Line/Hose: Recalls Recall 05V455000: Power Steering Hose Fracturing MAKE/MODELS: MODEL/BUILD YEARS: Buick/Rainier 2006 Cadillac/Escalade 2006 Chevrolet/Corvette 2005-2006 Chevrolet/Express 2006 Chevrolet/Silverado 2005-2006 Chevrolet/Tahoe 2006 Chevrolet/Trailblazer 2006 Chevrolet/Trailblazer EXT 2006 GMC/Envoy 2006 GMC/Envoy XL 2006 GMC/Savana 2006 GMC/Sierra 2005-2006 GMC/Yukon 2006 Hummer/H2 2006 Isuzu/Ascender 2006 MANUFACTURER: General Motors Corp. NHTSA CAMPAIGN ID NUMBER: 05V455000 MFG'S REPORT DATE: October 04, 2005 COMPONENT: Steering: Hydraulic Power Assist: Hose, Piping, and Connections POTENTIAL NUMBER OF UNITS AFFECTED: 123592 SUMMARY: Certain passenger vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. CONSEQUENCE: If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with Hydro-Boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. REMEDY: Dealers will inspect the power steering hose(s) for two suspect date codes and replace them if required. The recall will begin on October 14, 2005. Owners should contact Chevrolet at 1-800-630-2438, GMC at 1-866-996-9463, Buick at 1-866-608-8080, Cadillac at 1-866-982-2339, Isuzu at 1-800-255-6727, or HUMMER at 1-800-732-5493. NOTES: GM recall No. 05086. Customers can also contact The National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to http://www.safercar.gov. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures Technical Service Bulletin # 05086A Date: 051116 Recall - Power Steering Hose Fractures Product Safety - Power Steering Hose Fracture # 05086A - (Nov 16, 2005) Models: 2006 BUICK RAINIER 2006 CADILLAC ESCALADE 2005 CHEVROLET CORVETTE, SILVERADO 2006 CHEVROLET CORVETTE, EXPRESS, SILVERADO, TAHOE, TRAILBLAZER, TRAILBLAZER EXT 2005 GMC SIERRA 2006 GMC ENVOY, ENVOY XL, SAVANA, SIERRA, YUKON 2006 HUMMER H2 ALSO USED AS A SERVICE PART (18 PART NUMBERS INVOLVED) This bulletin is being revised to address hoses used to service 1991-2006 vehicles. Dealers who ordered these hoses for service are identified in the attachment contained in the Administrative Message (U.S.) or Dealer Communication (Canada). Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles. Some of these vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with hydro-boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. Note: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991-2006 vehicles. Correction Dealers are to inspect the power steering hose(s) for two suspect date codes and replace them if required. Dealers who have ordered the involved hoses for service (see listing in Administrative Message) are to search their part sales records to determine the name and address of the purchaser(s). If the purchaser is the owner of the vehicle, dealers are to send the owner a copy of the appropriate letter shown in this bulletin requesting them to bring their vehicle in for repair. If the purchaser is a body shop, independent repair shop, etc., dealers are to send the shop a copy of the appropriate letter shown in this bulletin requesting that they provide the customer's name, address, and telephone number so the dealer can send the owner a copy of the letter. Vehicles Involved Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3098 Involved are certain 2005 Chevrolet Corvette, Silverado; GMC Sierra; and 2006 Buick Rainier; Cadillac Escalade, Chevrolet Corvette, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer EXT; GMC Envoy, Envoy XL, Savana, Sierra, Yukon; and HUMMER H2 vehicles built within the VIN breakpoints shown. Important: Some of the affected hoses were shipped to dealers by GMSPO between July 25, 2005 and August 24, 2005 and could have been used to service 1991 - 2006 vehicles. Affected dealers have already been issued a Special Return Bulletin to return any shelf stock, refer to Administrative Message VSU20050801 - GMP05 -157. Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) prior to beginning recall repairs. [Not all vehicles within the above breakpoints may be involved.] For US and Canada For dealers involved vehicles, a Campaign Initiation Detail Report (CIDR) containing the complete vehicle identification number, customer name and address data has been prepared and will be loaded to the GM DealerWorld (US) Recall Information, GMinfoNet (Canada) Recall Reports. Dealers will not have a report available if they have no involved vehicles currently assigned. Dealers that have ordered involved hoses for service will also be listed in the report contained in the Administrative Message. For Export For dealers with involved vehicles, a Campaign Initiation Detail Report containing the complete vehicle identification number, customer name and address data has been prepared, and is being furnished to involved dealers. Dealers will not receive a report with the recall bulletin if they have no involved vehicles currently assigned. The Campaign Initiation Detail Report may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this recall. Parts Information Less than 10% of the involved vehicles will require hose replacement. If parts are required, order the appropriate hose(s) from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order. Claim Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3099 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3100 Submit a Product Recall claim with the information shown. Courtesy Transportation - For US and Canada The General Motors Courtesy Transportation Program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranty. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product recall is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for courtesy transportation guidelines. Customer Notification - For US and Canada General Motors will notify customers of this recall on their vehicle (see copy of customer letter shown in this bulletin). For vehicles with the recalled component installed on their vehicles outside of warranty, dealers are to notify customers of this recall using a copy of the letter shown in this bulletin. Customer Notification - For Export Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the sample letter. Dealer Recall Responsibility - For US and Export (US States, Territories, and Possession The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the recall is not completed within a reasonable time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3101 Dealer Recall Responsibility - All All unsold new vehicles in dealers' possession and subject to this recall must be held and inspected/repaired per the service procedure of this recall bulletin before customers take possession of these vehicles. Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is shown in this bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. In summary, whenever a vehicle subject to this recall enters your vehicle inventory, or is in your dealership for service in the future, you must take the steps necessary to be sure the recall correction has been made before selling or releasing the vehicle. Following this customer letter is another letter for customers identified through dealer search retype this letter and insert the appropriate information. Disclaimer Service Procedure Inspection Procedure 1. Inspect and record the power steering pressure line for the date code as shown above. The date code is printed on the hose and is repeated approximately every 6 inches (150 mm). Depending on the vehicle configuration, there may be one or two hoses to inspect. Vehicles equipped with the hydro-boost system will have two hoses while others will only have one hose. Removal of conduit may be necessary in order to inspect the date code. 2. Rainier/TrailBlazer/TrailBlazer EXT/Envoy/Envoy XL with 4.2L Engine Power Steering Pressure Hose (1). This pressure line has two hose sections and both must be inspected. Vehicle may need to be lifted to inspect both. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3102 3. Express/Savana Steering Pump to Hydro-Boost Pressure Line (2). 4. Express/Savana Hydro-Boost to Steering Gear Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3103 5. Silverado/Tahoe/Sierra/Yukon/Escalade Non Hydro-Boost Pressure Line (3). 6. Silverado/Tahoe/Sierra/Yukon/Escalade Power Steering Pump to Hydro-Boost Pressure Line (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3104 7. Silverado/Tahoe/Sierra/Yukon/Escalade Hydro-Boost to Steering Gear Pressure Line (1). 8. Hummer H2 Power Steering Pump to Hydro-Boost Pressure Line. 9. Hummer H2 Hydro-Boost to Steering Gear Pressure Line. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3105 10. Corvette Power Steering Pressure Hose (2). The vehicle will need to be lifted on a hoist for inspection. Removal of the power steering cooler bolts will give increased access to the pressure hose. 11. Compare the date code on the hose(s) to the suspect date codes shown. - If the date code is one of the codes listed, the hose(s) must be replaced. Proceed to the Hose Replacement Procedure. - If the date code is not one of the codes shown, then replace the conduit if applicable and no further action is required. Hose Replacement Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3106 If the inspection reveals that the hose needs to be replaced, follow the instructions in SI. Shown are the SI document numbers. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3107 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3108 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3109 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3110 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > 05086A > Nov > 05 > Recall - Power Steering Hose Fractures > Page 3111 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > 06-08-66-001 > Feb > 06 > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Power Steering Line/Hose: > NHTSA05V455000 > Oct > 05 > Recall 05V455000: Power Steering Hose Fracturing Power Steering Line/Hose: All Technical Service Bulletins Recall 05V455000: Power Steering Hose Fracturing MAKE/MODELS: MODEL/BUILD YEARS: Buick/Rainier 2006 Cadillac/Escalade 2006 Chevrolet/Corvette 2005-2006 Chevrolet/Express 2006 Chevrolet/Silverado 2005-2006 Chevrolet/Tahoe 2006 Chevrolet/Trailblazer 2006 Chevrolet/Trailblazer EXT 2006 GMC/Envoy 2006 GMC/Envoy XL 2006 GMC/Savana 2006 GMC/Sierra 2005-2006 GMC/Yukon 2006 Hummer/H2 2006 Isuzu/Ascender 2006 MANUFACTURER: General Motors Corp. NHTSA CAMPAIGN ID NUMBER: 05V455000 MFG'S REPORT DATE: October 04, 2005 COMPONENT: Steering: Hydraulic Power Assist: Hose, Piping, and Connections POTENTIAL NUMBER OF UNITS AFFECTED: 123592 SUMMARY: Certain passenger vehicles may have been built with a power steering hose that is not to specification. Under extreme steering maneuvers, such as turning the steering wheel fully to the left or right while braking, the hose may fracture and leak fluid. CONSEQUENCE: If this were to occur, power steering assist would be lost and increased steering effort would be required. On vehicles equipped with Hydro-Boost power brakes, it could also result in loss of power brake assist and increased braking effort would be required. If the power steering fluid spray were to spray onto hot engine parts, an engine compartment fire could occur. REMEDY: Dealers will inspect the power steering hose(s) for two suspect date codes and replace them if required. The recall will begin on October 14, 2005. Owners should contact Chevrolet at 1-800-630-2438, GMC at 1-866-996-9463, Buick at 1-866-608-8080, Cadillac at 1-866-982-2339, Isuzu at 1-800-255-6727, or HUMMER at 1-800-732-5493. NOTES: GM recall No. 05086. Customers can also contact The National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to http://www.safercar.gov. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Power Steering Line/Hose > Component Information > Technical Service Bulletins > All Other Service Bulletins for Power Steering Line/Hose: > Page 3116 Seat Back Frame: Service and Repair Seat Back Frame Replacement - Rear No. 1 SEAT BACK FRAME REPLACEMENT - REAR NO. 1 REMOVAL PROCEDURE 1. Remove the seat back cover and pad. 2. Remove the latch release assembly. 3. Remove the head restraint retractor assembly. 4. Remove the seat back hinge brackets. 5. Remove the seat belt retractor assembly, on the left side only. 6. Remove the latch release cable (1), and the head rest restraint cable (2) from the left-hand hinge bracket. 7. Remove the latch release cables from the right-hand hinge bracket. INSTALLATION PROCEDURE 1. Install the latch release cable to the right-hand hinge bracket. 2. Install the seat belt retractor assembly, on the left side only. 3. Install the seat back hinge brackets. 4. Install the head restraint retractor assembly. 5. Install the latch release assembly. 6. Install the latch release cables (1) and the head rest restraint cable (2) to the left-hand hinge bracket. 7. Install the seat back cover and pad. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement Radiator Hose: Service and Repair Radiator Inlet Hose Replacement Radiator Hose Replacement - Inlet (LH6, LS2) ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Drain the cooling system. 2. Remove the air intake resonator. 3. Using J 38185 reposition the radiator inlet hose clamp (1) from the engine. 4. Remove the outlet hose from the engine. 5. Using J 38185 reposition the radiator inlet hose clamp (2) from the radiator. 6. Remove the radiator outlet hose from the radiator. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement > Page 3121 1. Install the inlet hose to the radiator. 2. Using J 38185 reposition the radiator inlet hose clamp to the radiator. 3. Install the inlet hose to the engine. 4. Using J 38185 reposition the radiator inlet hose clamp to the engine. 5. Install the air intake resonator. 6. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement > Page 3122 Radiator Hose: Service and Repair Radiator Outlet Hose Replacement Radiator Hose Replacement - Outlet (LH6, LS2) ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Drain the cooling system. 2. Using J 38185 reposition the radiator outlet hose clamp (3). 3. Remove the radiator outlet hose (2) from the radiator. 4. Using J 38185 reposition the radiator outlet hose clamp. 5. Remove the radiator outlet hose from the engine (5). 6. Remove the radiator outlet hose. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Hoses > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement > Page 3123 1. Install the radiator outlet hose to the engine (5). 2. Using J 38185 reposition the radiator outlet hose clamp (3). 3. Install the radiator outlet hose (2) to the radiator (1). 4. Using J 38185 reposition the radiator outlet hose clamp (3). 5. Lower the vehicle. 6. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Brake Fluid > Component Information > Technical Service Bulletins > Customer Interest for Brake Fluid: > 08-05-22-002C > Apr > 09 > Brakes - Squeak Noise On Brake Pedal Application Brake Fluid: Customer Interest Brakes - Squeak Noise On Brake Pedal Application TECHNICAL Bulletin No.: 08-05-22-002C Date: April 07, 2009 Subject: Squeak Noise On Brake Apply (Remove Brake Fluid from Master Cylinder and Refill) Models: 2004-2007 Buick Rainier 2008 Buick Enclave 2004-2008 Chevrolet Colorado, TrailBlazer, TrailBlazer EXT, TrailBlazer SS 2008 Chevrolet Malibu 2009 Chevrolet Malibu (VIN position 11, 4 Orion MI. build with Build Date Prior to April 20, 2009) 2004-2008 GMC Canyon, Envoy, Envoy XL, Envoy XUV 2007-2008 GMC Acadia 2008 Pontiac G6 2009 Pontiac G6 (VIN position 11, 4 Orion MI. build with Build Date Prior to April 20, 2009) 2007-2008 Saturn OUTLOOK 2008 Saturn AURA 2005-2008 Saab 9-7X Supercede: This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 08-05-22-002B (Section 05 - Brakes). Condition Some customers may comment on a squeak noise when the brake pedal is applied or when released. This noise is normally heard when the brake pedal is slowly applied with the engine on or off, but can occur when the brake pedal is released. The noise may be isolated to the master cylinder area. Correction To correct this concern, remove as much of the old brake fluid from the master cylinder as possible and refill with a new DOT 3 brake fluid, P/N 88862806 (in Canada, use P/N 88862807). Start the vehicle and fully cycle the brake pedal until the noise diminishes to allow the new fluid to enter the system. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table above. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Brake Fluid > Component Information > Technical Service Bulletins > Customer Interest for Brake Fluid: > 08-05-22-002C > Apr > 09 > Brakes - Squeak Noise On Brake Pedal Application > Page 3133 For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Brake Fluid > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Brake Fluid: > 08-05-22-002C > Apr > 09 > Brakes - Squeak Noise On Brake Pedal Application Brake Fluid: All Technical Service Bulletins Brakes - Squeak Noise On Brake Pedal Application TECHNICAL Bulletin No.: 08-05-22-002C Date: April 07, 2009 Subject: Squeak Noise On Brake Apply (Remove Brake Fluid from Master Cylinder and Refill) Models: 2004-2007 Buick Rainier 2008 Buick Enclave 2004-2008 Chevrolet Colorado, TrailBlazer, TrailBlazer EXT, TrailBlazer SS 2008 Chevrolet Malibu 2009 Chevrolet Malibu (VIN position 11, 4 Orion MI. build with Build Date Prior to April 20, 2009) 2004-2008 GMC Canyon, Envoy, Envoy XL, Envoy XUV 2007-2008 GMC Acadia 2008 Pontiac G6 2009 Pontiac G6 (VIN position 11, 4 Orion MI. build with Build Date Prior to April 20, 2009) 2007-2008 Saturn OUTLOOK 2008 Saturn AURA 2005-2008 Saab 9-7X Supercede: This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 08-05-22-002B (Section 05 - Brakes). Condition Some customers may comment on a squeak noise when the brake pedal is applied or when released. This noise is normally heard when the brake pedal is slowly applied with the engine on or off, but can occur when the brake pedal is released. The noise may be isolated to the master cylinder area. Correction To correct this concern, remove as much of the old brake fluid from the master cylinder as possible and refill with a new DOT 3 brake fluid, P/N 88862806 (in Canada, use P/N 88862807). Start the vehicle and fully cycle the brake pedal until the noise diminishes to allow the new fluid to enter the system. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table above. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Brake Fluid > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Brake Fluid: > 08-05-22-002C > Apr > 09 > Brakes - Squeak Noise On Brake Pedal Application > Page 3139 For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Brake Fluid > Component Information > Specifications > Capacity Specifications Brake Fluid: Capacity Specifications Information not provided by manufacturer. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Brake Fluid > Component Information > Specifications > Capacity Specifications > Page 3142 Brake Fluid: Fluid Type Specifications HYDRAULIC BRAKE SYSTEM Delco Supreme 11 Brake Fluid or equivalent DOT-3 brake fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye Coolant: Technical Service Bulletins Cooling System - DEX-COOL(R) Coolant Leak Detection Dye Bulletin No.: 05-06-02-002B Date: January 18, 2008 INFORMATION Subject: DEX-COOL(R) Coolant - New Leak Detection Dye J 46366 - Replaces J 29545-6 Models: 1996-2008 GM Passenger Cars and Light/Medium Duty Trucks* (including Saturn) 1997-2008 Isuzu T-Series Medium Duty Tilt Cab Models Built in Janesville and Flint 1999-2008 Isuzu N-Series Medium Duty Commercial Models with 5.7L or 6.0L Gas Engine 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2008 Saab 9-7X *EXCLUDING 2006 and Prior Chevrolet Aveo, Epica, Optra, Vivant and Pontiac Matiz, Wave Supercede: This bulletin is being revised to include additional model years. Please discard Corporate Bulletin Number 05-06-02-002A (Section 06 - Engine/Propulsion System). Leak detection dye P/N 12378563 (J 29545-6) (in Canada P/N 88900915) may cause DEX-COOL(R) coolant to appear green in a black vessel making it appear to be conventional (green) coolant. This may cause a technician to add conventional coolant to a low DEX-COOL(R) system thus contaminating it. The green DEX-COOL(R) appearance is caused by the color of the leak detection dye which alters the color of the DEX-COOL(R) coolant. A new leak detection dye P/N 89022219 (J 46366) (in Canada P/N 89022220) has been released that does not alter the appearance of the DEX-COOL(R) coolant. When adding the new leak detection dye the color of the DEX-COOL(R) coolant will not change. For detecting leaks on any system that uses DEX-COOL(R) leak detection dye P/N 89022219 (in Canada P/N 89022220) should be used. The new leak detection dye can be used with both conventional and DEX-COOL(R) coolant. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 3147 Coolant: Technical Service Bulletins Cooling System - Coolant Recycling Information Bulletin No.: 00-06-02-006D Date: August 15, 2006 INFORMATION Subject: Engine Coolant Recycling and Warranty Information Models: 2007 and Prior GM Passenger Cars and Trucks (Including Saturn) 2007 and Prior HUMMER Vehicles 2005-2007 Saab 9-7X Attention: Please address this bulletin to the Warranty Claims Administrator and the Service Manager. Supercede: This bulletin is being revised to adjust the title and Include Warranty Information. Please discard Corporate Bulletin Number 00-06-02-006C (Section 06 - Engine/Propulsion System). Coolant Reimbursement Policy General Motors supports the use of recycled engine coolant for warranty repairs/service, providing a GM approved engine coolant recycling system is used. Recycled coolant will be reimbursed at the GMSPO dealer price for new coolant plus the appropriate mark-up. When coolant replacement is required during a warranty repair, it is crucial that only the relative amount of engine coolant concentrate be charged, not the total diluted volume. In other words: if you are using two gallons of pre-diluted (50:50) recycled engine coolant to service a vehicle, you may request reimbursement for one gallon of GM Goodwrench engine coolant concentrate at the dealer price plus the appropriate warranty parts handling allowance. Licensed Approved DEX-COOL(R) Providers Important: USE OF NON-APPROVED VIRGIN OR RECYCLED DEX-COOL(R) OR DEVIATIONS IN THE FORM OF ALTERNATE CHEMICALS OR ALTERATION OF EQUIPMENT, WILL VOID THE GM ENDORSEMENT, MAY DEGRADE COOLANT SYSTEM INTEGRITY AND PLACE THE COOLING SYSTEM WARRANTY UNDER JEOPARDY. Shown in Table 1 are the only current licensed and approved providers of DEX-COOL(R). Products that are advertised as "COMPATIBLE" or "RECOMMENDED" for use with DEX-COOL(R) have not been tested or approved by General Motors. Non-approved coolants may degrade the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 3148 coolant system integrity and will no longer be considered a 5 yr/150,000 mile (240,000 km) coolant. Coolant Removal Services/Recycling The tables include all coolant recycling processes currently approved by GM. Also included is a primary phone number and demographic information. Used DEX-COOL(R) can be combined with used conventional coolant (green) for recycling. Depending on the recycling service and/or equipment, it is then designated as a conventional 2 yr/30,000 mile (50,000 km) coolant or DEX-COOL(R) 5 yr/150,000 mile (240,000 km) coolant. Recycled coolants as designated in this bulletin may be used during the vehicle(s) warranty period. DEX-COOL(R) Recycling The DEX-COOL(R) recycling service listed in Table 2 has been approved for recycling waste engine coolants (DEX-COOL) or conventional) to DEX-COOL(R) with 5 yr/150,000 mile (240,000 km) usability. Recycling Fluid Technologies is the only licensed provider of Recycled DEX-COOL(R) meeting GM6277M specifications and utilizes GM approved inhibitor packages. This is currently a limited program being monitored by GM Service Operations which will be expanded as demand increases. Conventional (Green) Recycling Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 3149 Processes shown in the Table 3 are capable of recycling waste engine coolants (DEX-COOL(R) or conventional) to a conventional (green) coolant. Recycling conventional coolant can be accomplished at your facility by a technician using approved EQUIPMENT (listed by model number in Table 3), or by an approved coolant recycling SERVICE which may recycle the coolant at your facility or at an offsite operation. Refer to the table for GM approved coolant recyclers in either of these two categories. Should you decide to recycle the coolant yourself, strict adherence to the operating procedures is imperative. Use ONLY the inhibitor chemicals supplied by the respective (GM approved) recycling equipment manufacturer. Sealing Tablets Cooling System Sealing Tablets (Seal Tabs) should not be used as a regular maintenance item after servicing an engine cooling system. Discoloration of coolant can occur if too many seal tabs have been inserted into the cooling system. This can occur if seal tabs are repeatedly used over the service life of a vehicle. Where appropriate, seal tabs may be used if diagnostics fail to repair a small leak in the cooling system. When a condition appears in which seal tabs may be recommended, a specific bulletin will be released describing their proper usage. Water Quality The integrity of the coolant is dependent upon the quality of DEX-COOL(R) and water. DEX-COOL(R) is a product that has enhanced protection capability as well as an extended service interval. These enhanced properties may be jeopardized by combining DEX-COOL(R) with poor quality water. If you suspect the water in your area of being poor quality, it is recommended you use distilled or de-ionized water with DEX-COOL(R). "Pink" DEX-COOL(R) DEX-COOL(R) is orange in color to distinguish it from other coolants. Due to inconsistencies in the mixing of the dyes used with DEX-COOL(R), some batches may appear pink after time. The color shift from orange to pink does not affect the integrity of the coolant, and still maintains the 5 yr/150,000 mile (240,000 km) service interval. Back Service Only use DEX-COOL(R) if the vehicle was originally equipped with DEX-COOL(R). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 3150 Contamination Mixing conventional green coolant with DEX-COOL(R) will degrade the service interval from 5 yrs./150,000 miles (240,000 km) to 2 yrs./30,000 miles (50,000 km) if left in the contaminated condition. If contamination occurs, the cooling system must be flushed twice immediately and re-filled with a 50/50 mixture of DEX-COOL(R) and clean water in order to preserve the enhanced properties and extended service interval of DEX-COOL(R). After 5 years/150,000 miles (240,000 km) After 5 yrs/150,000 miles (240,000 km), the coolant should be changed, preferably using a coolant exchanger. If the vehicle was originally equipped with DEX-COOL(R) and has not had problems with contamination from non-DEX-COOL(R) coolants, then the service interval remains the same, and the coolant does not need to be changed for another 5 yrs/150,000 miles (240,000 km) Equipment (Coolant Exchangers) The preferred method of performing coolant replacement is to use a coolant exchanger. A coolant exchanger can replace virtually all of the old coolant with new coolant. Coolant exchangers can be used to perform coolant replacement without spillage, and facilitate easy waste collection. They can also be used to lower the coolant level in a vehicle to allow for less messy servicing of cooling system components. It is recommended that you use a coolant exchanger with a vacuum feature facilitates removing trapped air from the cooling system. This is a substantial time savings over repeatedly thermo cycling the vehicle and topping-off the radiator. The vacuum feature also allows venting of a hot system to relieve system pressure. Approved coolant exchangers are available through the GMDE (General Motors Dealer Equipment) program. For refilling a cooling system that has been partially or fully drained for repairs other than coolant replacement, the Vac-N-Fill Coolant Refill Tool (GE-47716) is recommended to facilitate removal of trapped air from the cooling system during refill. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Coolant > Component Information > Specifications > Capacity Specifications Coolant: Capacity Specifications Cooling System ................................................................................................................................... .............................................. 12.2 quarts (11.6 liters) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Coolant > Component Information > Specifications > Capacity Specifications > Page 3153 Coolant: Fluid Type Specifications ENGINE COOLANT The cooling system in your vehicle is filled with DEX-COOL engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 km), whichever occurs first, if you add only DEX-COOL extended life coolant. A 50/50 mixture of clean, drinkable water and DEX-COOL coolant will: ^ Give freezing protection down to -34°F (-37°C). ^ Give boiling protection up to 265°F (129°C). ^ Protect against rust and corrosion. ^ Help keep the proper engine temperature. ^ Let the warning lights and gages work as they should. NOTICE: Using coolant other than DEX-COOL may cause premature engine, heater core or radiator corrosion. In addition, the engine coolant may require changing sooner, at 30,000 miles (50 000 km) or 24 months, whichever occurs first. Any repairs would not be covered by your warranty. Always use DEX-COOL (silicate-free) coolant in your vehicle. WHAT TO USE Use a mixture of one-half clean, drinkable water and one-half DEX-COOL coolant which won't damage aluminum parts. If you use this coolant mixture, you don't need to add anything else. CAUTION: Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. Your vehicle's coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot but you would not get the overheat warning. Your engine could catch fire and you or others could be burned. Use a 50/50 mixture of clean, drinkable water and DEX-COOL coolant. NOTICE: If you use an improper coolant mixture, your engine could overheat and be badly damaged. The repair cost would not be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a year, check your cooling system. NOTICE: If you use the proper coolant, you do not have to add extra inhibitors or additives which claim to improve the system. These can be harmful. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information Fluid - A/T: Technical Service Bulletins A/T - DEXRON(R)-VI Fluid Information INFORMATION Bulletin No.: 04-07-30-037E Date: April 07, 2011 Subject: Release of DEXRON(R)-VI Automatic Transmission Fluid (ATF) Models: 2008 and Prior GM Passenger Cars and Light Duty Trucks 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2007 Saturn Relay 2005 and Prior Saturn L-Series 2005-2007 Saturn ION 2005-2008 Saturn VUE with 4T45-E 2005-2008 Saab 9-7X Except 2008 and Prior Chevrolet Aveo, Equinox Except 2006 and Prior Chevrolet Epica Except 2007 and Prior Chevrolet Optra Except 2008 and Prior Pontiac Torrent, Vibe, Wave Except 2003-2005 Saturn ION with CVT or AF23 Only Except 1991-2002 Saturn S-Series Except 2008 and Prior Saturn VUE with CVT, AF33 or 5AT (MJ7/MJ8) Transmission Only Except 2008 Saturn Astra Attention: DEXRON(R)-VI Automatic Transmission Fluid (ATF) is the only approved fluid for warranty repairs for General Motors transmissions/transaxles requiring DEXRON(R)-III and/or prior DEXRON(R) transmission fluids. Supercede: This bulletin is being revised to update information. Please discard Corporate Bulletin Number 04-07-30-037D (Section 07 - Transmission/Transaxle). MANUAL TRANSMISSIONS / TRANSFER CASES and POWER STEERING The content of this bulletin does not apply to manual transmissions or transfer cases. Any vehicle that previously required DEXRON(R)-III for a manual transmission or transfer case should now use P/N 88861800. This fluid is labeled Manual Transmission and Transfer Case Fluid. Some manual transmissions and transfer cases require a different fluid. Appropriate references should be checked when servicing any of these components. Power Steering Systems should now use P/N 9985010 labeled Power Steering Fluid. Consult the Parts Catalog, Owner's Manual, or Service Information (SI) for fluid recommendations. Some of our customers and/or General Motors dealerships/Saturn Retailers may have some concerns with DEXRON(R)-VI and DEXRON(R)-III Automatic Transmission Fluid (ATF) and transmission warranty claims. DEXRON(R)-VI is the only approved fluid for warranty repairs for General Motors transmissions/transaxles requiring DEXRON(R)-III and/or prior DEXRON(R) transmission fluids (except as noted above). Please remember that the clean oil reservoirs of the J-45096 - Flushing and Flow Tester machine should be purged of DEXRON(R)-III and filled with DEXRON(R)-VI for testing, flushing or filling General Motors transmissions/transaxles (except as noted above). DEXRON(R)-VI can be used in any proportion in past model vehicles equipped with an automatic transmission/transaxle in place of DEXRON(R)-III (i.e. topping off the fluid in the event of a repair or fluid change). DEXRON(R)-VI is also compatible with any former version of DEXRON(R) for use in automatic transmissions/transaxles. DEXRON(R)-VI ATF General Motors Powertrain has upgraded to DEXRON(R)-VI ATF with the start of 2006 vehicle production. Current and prior automatic transmission models that had used DEXRON(R)-III must now only use DEXRON(R)-VI. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information > Page 3158 All 2006 and future model transmissions that use DEXRON(R)-VI are to be serviced ONLY with DEXRON(R)-VI fluid. DEXRON(R)-VI is an improvement over DEXRON(R)-III in the following areas: * These ATF change intervals remain the same as DEXRON(R)-III for the time being. 2006-2008 Transmission Fill and Cooler Flushing Some new applications of the 6L80 six speed transmission will require the use of the J 45096 Flushing and Flow Tester to accomplish transmission fluid fill. The clean oil reservoir of the machine should be purged of DEXRON(R)-III and filled with DEXRON(R)-VI. Parts Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information > Page 3159 Fluid - A/T: Technical Service Bulletins A/T - Water Or Coolant Contamination Information INFORMATION Bulletin No.: 08-07-30-035B Date: November 01, 2010 Subject: Information on Water or Ethylene Glycol in Transmission Fluid Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks with Automatic Transmission Supercede: This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 08-07-30-035A (Section 07 - Transmission/Transaxle). Water or ethylene glycol in automatic transmission fluid (ATF) is harmful to internal transmission components and will have a negative effect on reliability and durability of these parts. Water or ethylene glycol in ATF will also change the friction of the clutches, frequently resulting in shudder during engagement or gear changes, especially during torque converter clutch engagement. Indications of water in the ATF may include: - ATF blowing out of the transmission vent tube. - ATF may appear cloudy or, in cases of extreme contamination, have the appearance of a strawberry milkshake. - Visible water in the oil pan. - A milky white substance inside the pan area. - Spacer plate gaskets that appear to be glued to the valve body face or case. - Spacer plate gaskets that appear to be swollen or wrinkled in areas where they are not compressed. - Rust on internal transmission iron/steel components. If water in the ATF has been found and the source of the water entry has not been identified, or if a leaking in-radiator transmission oil cooler is suspected (with no evidence of cross-contamination in the coolant recovery reservoir), a simple and quick test kit is available that detects the presence of ethylene glycol in ATF. The "Gly-Tek" test kit, available from the Nelco Company, should be obtained and the ATF tested to make an accurate decision on the need for radiator replacement. This can help to prevent customer comebacks if the in-radiator transmission oil cooler is leaking and reduce repair expenses by avoiding radiator replacement if the cooler is not leaking. These test kits can be obtained from: Nelco Company Test kits can be ordered by phone or through the website listed above. Orders are shipped standard delivery time but can be shipped on a next day delivery basis for an extra charge. One test kit will complete 10 individual fluid sample tests. For vehicles repaired under warranty, the cost of the complete test kit plus shipping charges should be divided by 10 and submitted on the warranty claim as a net item. The transmission should be repaired or replaced based on the normal cost comparison procedure. Important If water or coolant is found in the transmission, the following components MUST be replaced. - Replace all of the rubber-type seals. - Replace all of the composition-faced clutch plates and/or bands. - Replace all of the nylon parts. - Replace the torque converter. - Thoroughly clean and rebuild the transmission, using new gaskets and oil filter. Important The following steps must be completed when repairing or replacing. Flush and flow check the transmission oil cooler using J 45096. Refer to Corporate Bulletin Number 02-07-30-052F- Automatic Transmission Oil Cooler Flush and Flow Test Essential Tool J 45096 TransFlow. - Thoroughly inspect the engine cooling system and hoses and clean/repair as necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information > Page 3160 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Capacity Specifications Fluid - A/T: Capacity Specifications AUTOMATIC TRANSMISSION Pan Removal .................................................................................... .......................................................................................................... 4.7 liters (5.0 qts) Overhaul ...... .............................................................................................................................................................. ............................. 10.6 liters (11.0 qts) 280 mm Torque Converter Dry Fill ..................................................................................................................................................... 11.25 liters (11.9 qts) 300 mm Torque Converter Dry Fill ..................................................................................................................................................... 11.50 liters (12.1 qts) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Capacity Specifications > Page 3163 Fluid - A/T: Fluid Type Specifications AUTOMATIC TRANSMISSION DEXRON-VI Automatic Transmission Fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Page 3164 Fluid - A/T: Testing and Inspection Transmission Fluid Checking Procedure 1. Start the engine and operate the vehicle for 15 minutes or until the transmission fluid reaches an operating temperature of 82 - 93°C (180 - 200°F) . 2. Park the vehicle on a level surface. 3. With your foot on the brake, move the shift lever through each gear range. Pause for about 3 seconds in each range, ending in PARK. 4. Apply the parking brake and let the engine idle for 3 minutes. 5. Remove the transmission fluid level indicator. Wipe the indicator clean. Insert the indicator. Give the indicator a full twist in order to close. 6. Wait 3 seconds and remove the indicator. 7. Read both sides of the indicator. The fluid must be within the hot cross-hatched area using the lowest level reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Page 3165 Step 1 - Step 17 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Page 3166 Step 18 - Step 20 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Page 3167 Fluid - A/T: Service and Repair Automatic Transmission Fluid/Filter Replacement Removal Procedure Caution: When the transmission is at operating temperatures, take necessary precautions when removing the drain plug, to avoid being burned by draining fluid. 1. Raise and support the vehicle. 2. Place a drain pan under the transmission oil pan. 3. Remove the oil pan drain plug, if equipped. 4. If necessary, remove the bolts and position aside the range selector cable bracket for clearance while lowering the pan. It is not necessary to remove the cable from the lever or bracket. 5. Remove the oil pan bolts from the front and sides of the pan only. 6. Loosen the rear oil pan bolts approximately 4 turns. 7. Lightly tap the oil pan with a rubber mallet in order to loosen the pan to allow the fluid to drain. 8. Remove the remaining oil pan bolts. 9. Remove the oil pan and the gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Page 3168 10. Grasp firmly while pulling down with a twisting motion in order to remove the filter. 11. Remove the filter seal. The filter seal may be stuck in the pump; if necessary, carefully use pliers or another suitable tool to remove the seal. 12. Discard the seal. 13. Inspect the fluid color. 14. Inspect the filter. Pry the metal crimping away from the top of the filter and pull apart. The filter may contain the following evidence for root cause diagnosis: ^ Clutch material ^ Bronze slivers indicating bushing wear ^ Steel particles 15. Clean the transmission case and the oil pan gasket surfaces with solvent, and air dry. You must remove all traces of the old gasket material. Installation Procedure 1. Coat the new filter seal with automatic transmission fluid. 2. Install the new filter seal into the transmission case. Tap the seal into place using a suitable size socket. 3. Install the new filter into the case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - A/T > Component Information > Specifications > Page 3169 4. Install the oil pan and a new gasket. 5. Install the oil pan bolts. Tighten the oil pan to transmission case bolts alternately and evenly to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. If previously removed, install the range selector cable bracket and bolts. Tighten the bolts to 25 Nm (18 ft. lbs.). 7. Apply a small amount of sealant GM P/N 12346004 to the threads of the oil pan drain plug, if equipped. 8. Install the oil pan drain plug, if equipped. Tighten the oil pan drain plug to 18 Nm (13 ft. lbs.). 9. Lower the vehicle. 10. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Refer to Transmission Fluid Checking Procedure and Fluid Capacity Specifications. 11. Check the COLD fluid level reading for initial fill only. 12. Inspect the oil pan gasket for leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > Customer Interest: > 08-04-20-002 > Mar > 08 > Drivetrain - Growl/Groan/Shudder From Rear Differential Fluid - Differential: Customer Interest Drivetrain - Growl/Groan/Shudder From Rear Differential TECHNICAL Bulletin No.: 08-04-20-002 Date: March 19, 2008 Subject: Jerk/Jump Sensation with Growl/Groan Noise, Shudder, Bind From Rear of Vehicle While Turning (Drain/Refill Rear Differential Fluid) Models: 2006-2008 Chevrolet TrailBlazer SS 2005-2008 Saab 9-7X 2008 Saab 9-7X Aero with Limited Slip Differential (RPO G86) Condition Some customers may comment on a jerk or jump feeling accompanied by a growl/groan noise, shudder or bind from the rear of the vehicle while turning. Cause This may be caused by slip/stick of the posi-traction clutch plates. As plates slip and stick, a jump or jerk feeling occurs accompanied by a growl or groan noise. Correction 1. Remove the rear differential fluid using the procedure provided in SI. Important: DO NOT add any limited-slip additive (friction modifier). With this new fluid (DEXRON(R) LS Gear Oil 75W-90), it is no longer required to add friction modifier. If a friction modifier is added, it will cause the fluid to lose some of its friction reducing properties as well as reducing seal life. 2. Fill the differential with DEXRON(R) LS gear oil, P/N 88862624 (in Canada, P/N 88862625). 3. Follow the procedures in SI for the 8.6 in axle on the Saab 9-7X 4.2L and 5.3L models. The lubricant levels should be between 0 mm to 10 mm (0 in to 0.4 in) below the fill plug opening. 4. Follow the procedures in SI for the 9.5 in LD Axle on TrailBlazer SS and Saab 9-7X Aero models. The lubricant level should be between 15 mm to 40 mm (0.6 in to 1.6 in) below the fill plug opening. 5. Once the differential fluid is changed, the vehicle must be driven in 8-10 tight figure eight maneuvers to allow the fluid to be worked into the clutch plates. Important: If the noise condition is improved by this procedure but is not completely eliminated, it may be necessary to perform the procedure a second time. Notice: There will be some vehicles where the damage to the clutch packs from wear or moisture will be too extensive to be fixed by this procedure. In this case replace the rear differential center section (differential gear case) which includes clutch plate and springs. Parts Information Warranty Information (Excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > Customer Interest: > 08-04-20-002 > Mar > 08 > Drivetrain - Growl/Groan/Shudder From Rear Differential > Page 3178 For vehicles repaired under warranty use, the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty use, the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 08-04-20-002 > Mar > 08 > Drivetrain Growl/Groan/Shudder From Rear Differential Fluid - Differential: All Technical Service Bulletins Drivetrain - Growl/Groan/Shudder From Rear Differential TECHNICAL Bulletin No.: 08-04-20-002 Date: March 19, 2008 Subject: Jerk/Jump Sensation with Growl/Groan Noise, Shudder, Bind From Rear of Vehicle While Turning (Drain/Refill Rear Differential Fluid) Models: 2006-2008 Chevrolet TrailBlazer SS 2005-2008 Saab 9-7X 2008 Saab 9-7X Aero with Limited Slip Differential (RPO G86) Condition Some customers may comment on a jerk or jump feeling accompanied by a growl/groan noise, shudder or bind from the rear of the vehicle while turning. Cause This may be caused by slip/stick of the posi-traction clutch plates. As plates slip and stick, a jump or jerk feeling occurs accompanied by a growl or groan noise. Correction 1. Remove the rear differential fluid using the procedure provided in SI. Important: DO NOT add any limited-slip additive (friction modifier). With this new fluid (DEXRON(R) LS Gear Oil 75W-90), it is no longer required to add friction modifier. If a friction modifier is added, it will cause the fluid to lose some of its friction reducing properties as well as reducing seal life. 2. Fill the differential with DEXRON(R) LS gear oil, P/N 88862624 (in Canada, P/N 88862625). 3. Follow the procedures in SI for the 8.6 in axle on the Saab 9-7X 4.2L and 5.3L models. The lubricant levels should be between 0 mm to 10 mm (0 in to 0.4 in) below the fill plug opening. 4. Follow the procedures in SI for the 9.5 in LD Axle on TrailBlazer SS and Saab 9-7X Aero models. The lubricant level should be between 15 mm to 40 mm (0.6 in to 1.6 in) below the fill plug opening. 5. Once the differential fluid is changed, the vehicle must be driven in 8-10 tight figure eight maneuvers to allow the fluid to be worked into the clutch plates. Important: If the noise condition is improved by this procedure but is not completely eliminated, it may be necessary to perform the procedure a second time. Notice: There will be some vehicles where the damage to the clutch packs from wear or moisture will be too extensive to be fixed by this procedure. In this case replace the rear differential center section (differential gear case) which includes clutch plate and springs. Parts Information Warranty Information (Excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 08-04-20-002 > Mar > 08 > Drivetrain Growl/Groan/Shudder From Rear Differential > Page 3184 For vehicles repaired under warranty use, the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty use, the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking Fluid - Differential: All Technical Service Bulletins Drivetrain - Revised Rear Axle Fluid Level/Checking Bulletin No.: 06-04-20-003 Date: October 10, 2006 SERVICE MANUAL UPDATE Subject: Revised Rear Axle Fluid Capacity and Fluid Level Checking Specification Models: 2005-2007 Buick Rainier 2005-2007 Chevrolet TrailBlazer Models 2005-2007 GMC Envoy Models This bulletin is being issued to revise the rear axle fluid capacity and fluid level checking specification in the Rear Axle sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 3189 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 3190 The information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking Fluid - Differential: All Technical Service Bulletins Drivetrain - Revised Rear Axle Fluid Level/Checking Bulletin No.: 06-04-20-003 Date: October 10, 2006 SERVICE MANUAL UPDATE Subject: Revised Rear Axle Fluid Capacity and Fluid Level Checking Specification Models: 2005-2007 Buick Rainier 2005-2007 Chevrolet TrailBlazer Models 2005-2007 GMC Envoy Models This bulletin is being issued to revise the rear axle fluid capacity and fluid level checking specification in the Rear Axle sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 3196 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 3197 The information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Specifications > Capacity Specifications Fluid - Differential: Capacity Specifications DIFFERENTIAL FLUID Front .............................................................................................................. .......................................................................................... 0.8 liters (1.7 pints) Rear .......................... .............................................................................................................................................................. ................. 2.0 liters (4.3 pints) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Specifications > Capacity Specifications > Page 3200 Fluid - Differential: Fluid Type Specifications AXLE LUBRICANT FRONT AXLE SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115. REAR AXLE (EXCEPT SS MODEL) SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115. REAR AXLE (SS MODEL) SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115. With a complete drain and refill add 4 ounces (118 ml) of Limited-Slip Axle Lubricant Additive (GM Part No. U.S. 1052358, in Canada 992694) where required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Specifications > Page 3201 Fluid - Differential: Diagrams Rear Axle Disassembled Views Rear Axle Disassembled Views 1 - Bolt 2 - Rear Axle Housing Cover 3 - Rear Axle Housing Cover Gasket 4 - Thrust Washer 5 Differential Pinion Gear 6 - Differential Side Gear 7 - Thrust Washer 8 - Differential Pinion Gear 9 Thrust Washer 10 - Differential Side Gear 11 - Thrust Washer 12 - Bearing Cap Bolts 13 - Bearing Cap 14 - Differential Bearing Shim 15 - Differential Bearing and Cup 16 - Differential Ring Gear Bolt 17 - Differential Case 18 - Pinion Gear Shaft 19 - Pinion Gear Bearing Shim 20 - Inner Pinion Bearing and Cup 21 - Rear Axle Housing 22 - Wheel Bearing 23 - Rear Axle Shaft Seal 24 - Brake Backing Plate 25 - Brake Backing Plate Bolt 26 - Brake Caliper 27 - Brake Caliper Bolt 28 - Brake Rotor 29 - Wheel Stud 30 - Rear Axle Shaft 31 - Rear Axle Shaft Lock 32 - Pinion Yoke Nut 33 - Pinion Yoke Washer 34 - Pinion Yoke 35 - Pinion Gear Seal 36 - Outer Pinion Bearing and Cup 37 - Pinion Gear Bearing Spacer 38 - Rear Axle Housing Drain Plug 39 - Rear Axle Housing Fill Plug 40 - Wheel Bearing 41 - Rear Axle Shaft Seal 42 - Rear Axle Shaft Lock 43 - Rear Axle Shaft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Specifications > Page 3202 44 - Wheel Stud 45 - Brake Caliper 46 - Brake Caliper Bolt 47 - Brake Rotor 48 - Brake Backing Plate Bolt 49 - Brake Backing Plate 50 - Rear Axle Vent Hose Connector 51 - Differential Bearing Shim 52 - Differential Bearing and Cup 53 - Bearing Cap 54 - Bearing Cap Bolts 55 - Differential Ring Gear 56 - Differential Pinion Gear Shaft Bolt 57 - Differential Pinion Gear Shaft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Service and Repair > Lubricant Level Inspection - Rear Drive Axle Fluid - Differential: Service and Repair Lubricant Level Inspection - Rear Drive Axle Lubricant Level Inspection - Rear Drive Axle 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Make sure the vehicle is level. 3. Inspect the rear axle for leaks. Repair as necessary. 4. Clean the area around the rear axle fill plug. 5. Remove the rear axle fill plug. 6. Fabricate a dipstick from a pipe cleaner or similar item. Form the pipe cleaner into the shape of an "L". 7. Insert the pipe cleaner into the fill plug opening with the stem "L" is facing down. Important: Ensure that the pipe cleaner is resting on the bottom threads of the fill hole. 8. Inspect the lubricant level. The lubricant level should be between 0 - 10 mm (0 - 0.4 inch) below the fill plug opening. 9. If the fluid level is low, add lubricant until the level is even with the bottom edge of the fill plug opening. Use the proper fluid. Refer to Fluid and Lubricant Recommendations. 10. Install the rear axle fill plug. Tighten the rear axle fill plug to 33 Nm (24 ft. lbs.). Notice: Refer to Fastener in Service Precautions. 11. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Fluid - Differential > Component Information > Service and Repair > Lubricant Level Inspection - Rear Drive Axle > Page 3205 Fluid - Differential: Service and Repair Lubricant Replacement - Rear Drive Axle Lubricant Replacement - Rear Drive Axle Removal Procedure 1. Clean the area around the rear axle fill plug. 2. Remove the rear axle fill plug. 3. Remove the rear axle cover. 4. Drain the lubricant into a suitable container. Installation Procedure 1. Install the rear axle cover. 2. Inspect the fluid level. 3. Fill the rear axle with axle lubricant. Use the proper fluid. Refer to Capacities - Approximate Fluid. 4. Install the rear axle fill plug. Tighten the rear axle fill plug to 33 Nm (24 ft. lbs.). Notice: Refer to Fastener in Service Precautions. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Technical Service Bulletins > Engine - GM dexos 1 and dexos 2(R) Oil Specifications Engine Oil: Technical Service Bulletins Engine - GM dexos 1 and dexos 2(R) Oil Specifications INFORMATION Bulletin No.: 11-00-90-001 Date: March 14, 2011 Subject: Global Information for GM dexos1(TM) and GM dexos2(TM) Engine Oil Specifications for Spark Ignited and Diesel Engines, Available Licensed Brands, and Service Fill for Adding or Complete Oil Change Models: 2012 and Prior GM Passenger Cars and Trucks Excluding All Vehicles Equipped with Duramax(TM) Diesel Engines GM dexos 1(TM) Information Center Website Refer to the following General Motors website for dexos 1(TM) information about the different licensed brands that are currently available: http://www.gmdexos.com GM dexos 1(TM) Engine Oil Trademark and Icons The dexos(TM) specification and trademarks are exclusive to General Motors, LLC. Only those oils displaying the dexos‹›(TM) trademark and icon on the front label meet the demanding performance requirements and stringent quality standards set forth in the dexos‹›(TM) specification. Look on the front label for any of the logos shown above to identify an authorized, licensed dexos 1(TM) engine oil. GM dexos 1(TM) Engine Oil Specification Important General Motors dexos 1(TM) engine oil specification replaces the previous General Motors specifications GM6094M, GM4718M and GM-LL-A-025 for most GM gasoline engines. The oil specified for use in GM passenger cars and trucks, PRIOR to the 2011 model year remains acceptable for those previous vehicles. However, dexos 1(TM) is backward compatible and can be used in those older vehicles. In North America, starting with the 2011 model year, GM introduced dexos 1(TM) certified engine oil as a factory fill and service fill for gasoline engines. The reasons for the new engine oil specification are as follows: - To meet environmental goals such as increasing fuel efficiency and reducing engine emissions. - To promote long engine life. - To minimize the number of engine oil changes in order to help meet the goal of lessening the industry's overall dependence on crude oil. dexos 1(TM) is a GM-developed engine oil specification that has been designed to provide the following benefits: - Further improve fuel economy, to meet future corporate average fuel economy (CAFE) requirements and fuel economy retention by allowing the oil to maintain its fuel economy benefits throughout the life of the oil. - More robust formulations for added engine protection and aeration performance. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Technical Service Bulletins > Engine - GM dexos 1 and dexos 2(R) Oil Specifications > Page 3210 - Support the GM Oil Life System, thereby minimizing the replacement of engine oil, before its life has been depleted. - Reduce the duplication of requirements for a large number of internal GM engine oil specifications. International Lubricants Standardization and Approval Committee (ILSAC) GF-5 Standard In addition to GM dexos 1(TM), a new International Lubricants Standardization and Approval Committee (ILSAC) standard called GF-5, was introduced in October 2010. - There will be a corresponding API category, called: SN Resource Conserving. The current GF-4 standard was put in place in 2004 and will become obsolete in October 2011. Similar to dexos 1(TM), the GF-5 standard will use a new fuel economy test, Sequence VID, which demands a statistically significant increase in fuel economy versus the Sequence VIB test that was used for GF-4. - It is expected that all dexos 1(TM) approved oils will be capable of meeting the GF-5 standard. However, not all GF-5 engine oils will be capable of meeting the dexos 1(TM) specification. - Like dexos(TM), the new ILSAC GF-5 standard will call for more sophisticated additives. The API will begin licensing marketers during October 2010, to produce and distribute GF-5 certified products, which are expected to include SAE 0W-20, 0W-30, 5W-20, 5W-30 and 10W-30 oils. Corporate Average Fuel Economy (CAFE) Requirements Effect on Fuel Economy Since CAFE standards were first introduced in 1974, the fuel economy of cars has more than doubled, while the fuel economy of light trucks has increased by more than 50 percent. Proposed CAFE standards call for a continuation of increased fuel economy in new cars and trucks. To meet these future requirements, all aspects of vehicle operation are being looked at more critically than ever before. New technology being introduced in GM vehicles designed to increase vehicle efficiency and fuel economy include direct injection, cam phasing, turbocharging and active fuel management (AFM). The demands of these new technologies on engine oil also are taken into consideration when determining new oil specifications. AFM for example can help to achieve improved fuel economy. However alternately deactivating and activating the cylinders by not allowing the intake and exhaust valves to open contributes to additional stress on the engine oil. Another industry trend for meeting tough fuel economy mandates has been a shift toward lower viscosity oils. dexos 1(TM) will eventually be offered in several viscosity grades in accordance with engine needs: SAE 0W-20, 5W-20, 0W-30 and 5W-30. Using the right viscosity grade oil is critical for proper engine performance. Always refer to the Maintenance section of a vehicle Owner Manual for the proper viscosity grade for the engine being serviced. GM Oil Life System in Conjunction With dexos (TM) Supports Extended Oil Change Intervals To help conserve oil while maintaining engine protection, many GM vehicles are equipped with the GM Oil Life System. This system can provide oil change intervals that exceed the traditional 3,000 mile (4,830 km) recommendation. The dexos (TM) specification, with its requirements for improved oil robustness, compliments the GM Oil Life System by supporting extended oil change intervals over the lifetime of a vehicle. If all GM customers with GM Oil Life System equipped vehicles would use the system as intended, GM estimates that more than 100 million gallons of oil could be saved annually. GM dexos 2(TM) Information Center Website Refer to the following General Motors website for dexos 2(TM) information about the different licensed brands that are currently available: http://www.gmdexos.com GM dexos 2(TM) Engine Oil Trademark and Icons Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Technical Service Bulletins > Engine - GM dexos 1 and dexos 2(R) Oil Specifications > Page 3211 The dexos (TM) specification and trademarks are exclusive to General Motors, LLC. Only those oils displaying the dexos (TM) trademark and icon on the front label meet the demanding performance requirements and stringent quality standards set forth in the dexos (TM)specification. Look on the front label for any of the logos shown above to identify an authorized, licensed dexos 2(TM) engine oil. GM dexos 2(TM) Engine Oil Specification - dexos 2(TM) is approved and recommended by GM for use in Europe starting in model year 2010 vehicles, regardless of where the vehicle was manufactured. - dexos 2(TM) is the recommended service fill oil for European gasoline engines. Important The Duramax(TM) diesel engine is the exception and requires lubricants meeting specification CJ-4. - dexos 2(TM) is the recommended service fill oil for European light-duty diesel engines and replaces GM-LL-B-025 and GM-LL-A-025. - dexos 2(TM) protects diesel engines from harmful soot deposits and is designed with limits on certain chemical components to prolong catalyst life and protect expensive emission reduction systems. It is a robust oil, resisting degradation between oil changes and maintaining optimum performance longer. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Specifications > Capacity Specifications Engine Oil: Capacity Specifications Engine Oil with Filter ............................................................................................................................ ............................................... 6.0 quarts (5.7 liters) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Specifications > Capacity Specifications > Page 3214 Engine Oil: Fluid Type Specifications ENGINE OIL TYPE LOOK FOR THESE THINGS: 1.Your vehicle's engine requires a special oil meeting GM Standard GM4718M. Oils meeting this standard may be identified as synthetic. However, not all synthetic oils will meet this GM standard. You should look for and use only an oil that meets GM Standard GM4718M. NOTICE: If you use oils that do not have the GM4718M Standard designation, you can cause engine damage not covered by your warranty. 2.SAE 5W-30 is best for your vehicle. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 20W-50. Oils meeting these requirements should also have the starburst symbol on the container. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). You should look for this on the oil container, and use only those oils that are identified as meeting GM Standard GM4718M and have the starburst symbol on the front of the oil container. Your vehicle's engine is filled at the factory with a Mobil 1 synthetic oil, which meets all requirements for your vehicle. Substitute Engine Oil: When adding oil to maintain engine oil level, oil meeting GM Standard GM4718M may not be available. You can add substitute oil designated SAE 5W-30 with the starburst symbol at all temperatures. Substitute oil not meeting GM Standard GM4718M should not be used for an oil change. ENGINE OIL ADDITIVES Do not add anything to your oil. The recommended oils with the starburst symbol that meet GM Standard GM4718M are all you will need for good performance and engine protection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Specifications > Page 3215 Engine Oil: Service and Repair Engine Oil and Oil Filter Replacement Removal Procedure Important: In order to completely drain the oil from the oil pan internal baffling, the bottom of the oil pan must be level during the oil drain procedure. 1. Open the hood. 2. Remove the intake manifold sight shield. 3. Remove the oil fill cap. 4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. 5. Position a suitable drain pan under the oil pan drain plug. 6. Remove the oil pan drain plug. 7. Allow the oil to drain completely. 8. Clean and inspect the oil pan drain plug, replace if necessary. 9. Clean and inspect the oil pan drain plug sealing surface, replace the oil pan if necessary. 10. Wipe any remaining oil from the drain plug hole and reinstall the oil pan drain plug until snug. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Specifications > Page 3216 11. Position a suitable drain pan under the oil filter. 12. Remove the oil filter. 13. Ensure that the oil filter gasket is still on the old filter, if not remove the oil filter gasket from the oil pan. Installation Procedure 1. Apply clean engine oil to the NEW oil filter gasket. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the NEW oil filter. ^ Tighten the filter to 30 Nm (22 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Engine Oil > Component Information > Specifications > Page 3217 3. Tighten the oil drain plug. ^ Tighten the drain plug to 25 Nm (18 ft. lbs.). 4. Remove the oil drain pan from under the vehicle. 5. Lower the vehicle. 6. Fill the crankcase with new engine oil. Refer to Capacities - Approximate Fluid and Fluid and Lubricant Recommendations. 7. Start the engine. 8. Inspect for oil leaks after engine start up. 9. Turn off the engine and allow the oil a few minutes to drain back into the oil pan. 10. Remove the oil level indicator from the oil indicator tube. 11. Clean off the indicator end of the oil level indicator with a clean paper towel or cloth. 12. Install the oil level indicator into the oil level indicator tube until the oil level indicator handle contacts the top of the oil level indicator tube. 13. Again, remove the oil level indicator from the oil level indicator tube keeping the tip of the oil level indicator down. 14. Check the level of the engine oil on the oil level indicator. 15. If necessary, adjust the oil level by adding or draining oil. 16. Check for oil leaks. 17. Install the intake manifold sight shield. 18. Close the hood. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Power Steering Fluid > Component Information > Specifications > Capacity Specifications Power Steering Fluid: Capacity Specifications Information not provided by manufacturer. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Power Steering Fluid > Component Information > Specifications > Capacity Specifications > Page 3222 Power Steering Fluid: Fluid Type Specifications POWER STEERING SYSTEM GM Power Steering Fluid GM P/N 89021184 (Canadian P/N 89021186) or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant > Component Information > Technical Service Bulletins > A/C - Refrigerant Recovery/Recycling/Equipment Refrigerant: Technical Service Bulletins A/C - Refrigerant Recovery/Recycling/Equipment Bulletin No.: 08-01-38-001 Date: January 25, 2008 INFORMATION Subject: Information On New GE-48800 CoolTech Refrigerant Recovery/Recharge Equipment Models: 2008 and Prior GM Passenger Cars and Light Duty Trucks (Including Saturn) 2008 and Prior HUMMER H2, H3 2005-2008 Saab 9-7X Attention: This bulletin is being issued to announce the release of GM approved Air Conditioning (A/C) Refrigerant Recovery and Recharging Equipment that meets the new Society of Automotive Engineers (SAE) J2788 Refrigerant Recovery Standards. The ACR2000 (J-43600) cannot be manufactured in its current state after December 2007 and will be superseded by GE-48800. The new J2788 standard does not require that GM Dealers replace their ACR2000 units. ACR2000's currently in use are very capable of servicing today's refrigerant systems when used correctly and can continue to be used. Details regarding the new SAE J2788 standard are outlined in GM Bulletin 07-01-38-004. Effective February 1 2008, new A/C Refrigerant Recovery/Recharging equipment (P/N GE-48800) will be released as a required replacement for the previously essential ACR2000 (J-43600). This equipment is SAE J2788 compliant and meets GM requirements for A/C Refrigerant System Repairs on all General Motors vehicles, including Hybrid systems with Polyolester (POE) refrigerant oil. This equipment will not be shipped as an essential tool to GM Dealerships. In addition, this equipment is Hybrid compliant and designed to prevent oil cross contamination when servicing Hybrid vehicles with Electric A/C Compressors that use POE refrigerant oil. The ACR2000 (J-43600) will need to be retrofitted with a J-43600-50 (Hose - ACR2000 Oil Flush Loop) to be able to perform Hybrid A/C service work. All Hybrid dealers will receive the J-43600-50, with installation instructions, as a component of the Hybrid essential tool package. Dealerships that do not sell Hybrids, but may need to service Hybrids, can obtain J-43600-50 from SPX Kent Moore. Refer to GM Bulletin 08-01-39-001 for the ACR2000 Hose Flush procedure. The High Voltage (HV) electric A/C compressor used on Two Mode Hybrid vehicles uses a Polyolester (POE) refrigerant oil instead of a Polyalkylene Glycol (PAG) synthetic refrigerant oil. This is due to the better electrical resistance of the POE oil and its ability to provide HV isolation. Failure to flush the hoses before adding refrigerant to a Hybrid vehicle with an electric A/C compressor may result in an unacceptable amount of PAG oil entering the refrigerant system. It may cause a Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost Diagnostic Trouble Code (DTC P1AE7) to be set. Additionally, the A/C system warranty will be voided. Warranty Submission Requirements The Electronically Generated Repair Data (snapshot summary) and printer functions have been eliminated from the GE-48800. The VGA display and temperature probes were eliminated to reduce equipment costs. As a result, effective immediately the 18 digit "Snapshot/Charge Summary" code is no longer required for Air Conditioning (A/C) refrigerant system repairs that are submitted for warranty reimbursement. The charge summary data from before and after system repairs will continue to required, but documented on the repair order only. Both high and low pressures and the recovery and charge amounts should be noted during the repair and entered on the repair order. If using ACR2000 (J-43600), the "Snapshot/Charge Summary" printouts should continue to be attached to the shops copy of the repair order. The labor codes that are affected by this requirement are D3000 through D4500. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant > Component Information > Technical Service Bulletins > A/C - Refrigerant Recovery/Recycling/Equipment > Page 3227 Refrigerant: Technical Service Bulletins A/C - Contaminated R134A Refrigerant Bulletin No.: 06-01-39-007 Date: July 25, 2006 INFORMATION Subject: Contaminated R134a Refrigerant Found on Market for Automotive Air-Conditioning Systems Models: 2007 and Prior GM Passenger Cars and Trucks (including Saturn) 2007 and Prior HUMMER H2, H3 2007 and Prior Saab 9-7X Attention: This bulletin should be directed to the Service Manager as well as the Parts Manager. Commercially Available Contaminated R134a Refrigerant Impurities have been found in new commercially available containers of R134a. High levels of contaminates may cause decreased performance, and be detrimental to some air-conditioning components. Accompanying these contaminates has been high levels of moisture. Tip: Excessive moisture may cause system concerns such as orifice tube freeze-up and reduced performance. Industry Reaction: New Industry Purity Standards Due to the potential availability of these lower quality refrigerants, the Society of Automotive Engineers (SAE), and the Air Conditioning and Refrigeration Industry (ARI) are in the process of instituting reliable standards that will be carried on the labels of future R134a refrigerant containers. This identifying symbol will be your assurance of a product that conforms to the minimum standard for OEM Automotive Air-Conditioning use. How Can You Protect Yourself Today? It is recommended to use GM or ACDelco(R) sourced refrigerants for all A/C repair work. These refrigerants meet General Motors own internal standards for quality and purity, insuring that your completed repairs are as good as the way it left the factory. Parts Information The part numbers shown are available through GMSPO or ACDelco(R). The nearest ACDelco(R) distributor in your area can be found by calling 1-800-223-3526 (U.S. Only). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant > Component Information > Technical Service Bulletins > A/C - Refrigerant Recovery/Recycling/Equipment > Page 3228 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant > Component Information > Specifications > Capacity Specifications Refrigerant: Capacity Specifications AIR CONDITIONING REFRIGERANT Refrigerant Charge............................................................................................................................... ...................................................... 0.8 kg (1.9 lbs.) Refrigerant Charge with Rear A/C .......................................................................................................................................................... 1.2 kg (2.65 lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant > Component Information > Specifications > Capacity Specifications > Page 3231 Refrigerant: Fluid Type Specifications Air Conditioning Refrigerant ....................................................................................................................... R134a P/N 12356150 U.S. (10953485 Canada) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant > Component Information > Specifications > Page 3232 Refrigerant: Service and Repair REFRIGERANT RECOVERY AND RECHARGING TOOLS REQUIRED - J 43600 ACR 2000 Air Conditioning Service Center - J 45037 A/C Oil Injector CAUTION: Avoid breathing the A/C Refrigerant 134a (R-134a) and the lubricant vapor or the mist. Exposure may irritate the eyes, nose, and throat. Work in a well ventilated area. In order to remove R-134a from the A/C system, use service equipment that is certified to meet the requirements of SAE J 2210 (R-134a recycling equipment). If an accidental system discharge occurs, ventilate the work area before continuing service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers. - For personal protection, goggles and gloves should be worn and a clean cloth wrapped around fittings, valves, and connections when doing work that includes opening the refrigerant system. If R-134a comes in contact with any part of the body severe frostbite and personal injury can result. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained. NOTE: R-134a is the only approved refrigerant for use in this vehicle. The use of any other refrigerant may result in poor system performance or component failure. - To avoid system damage use only R-134a dedicated tools when servicing the A/C system. - Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and O-rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result. - R-12 refrigerant and R-134a refrigerant must never be mixed, even in the smallest of amounts, as they are incompatible with each other. If the refrigerants are mixed, compressor failure is likely to occur. Refer to the manufacturer instructions included with the service equipment before servicing. The J 43600 is a complete air conditioning service center for R-134a. The ACR 2000 recovers, recycles, evacuates and recharges A/C refrigerant quickly, accurately and automatically. The unit has a display screen that contains the function controls and displays prompts that will lead the technician through the recover, recycle, evacuate and recharge operations. R-134a is recovered into and charged out of an internal storage vessel. The ACR 2000 automatically replenishes this vessel from an external source tank in order to maintain a constant 5.45-6.82 kg (12-15 lbs) of A/C refrigerant. The ACR 2000 has a built in A/C refrigerant identifier that will test for contamination, prior to recovery and will notify the technician if there are foreign gases present in the A/C system. If foreign gases are present, the ACR 2000 will not recover the refrigerant from the A/C system. The ACR 2000 also features automatic air purge, single pass recycling and an automatic oil drain. Refer to the J 43600 ACR 2000 manual for operation and setup instruction. Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant System Capacities for the correct amount. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant Oil > Component Information > Technical Service Bulletins > A/C - New PAG Oil Refrigerant Oil: Technical Service Bulletins A/C - New PAG Oil Bulletin No.: 02-01-39-004B Date: November 16, 2005 INFORMATION Subject: New PAG Oil Released Models: 2006 and Prior GM Passenger Cars and Trucks (Including Saturn) 2003-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Built With R-134a Refrigeration System All Air Conditioning Compressor Types (Excluding R4 and A6 Type Compressors) Supercede: This bulletin is being revised to change the PAG oil part number used for R4 and A6 compressors with R-134a refrigerant systems. Please discard Corporate Bulletin Number 02-01-39-004A (Section 01 - HVAC). All General Motors vehicles built with R-134a refrigerant systems shall now be serviced with GM Universal PAG Oil (excluding vehicles equipped with an R4 or A6 compressor). R4 and A6 compressors with R-134a refrigerant systems shall use PAG OIL, GM P/N 12356151 (A/C Delco part number 15-118) (in Canada, use P/N 10953486). Important: The PAG oil referenced in this bulletin is formulated with specific additive packages that meet General Motors specifications and use of another oil may void the A/C systems warranty. Use this new PAG oil when servicing the A/C system on the vehicles listed above. Oil packaged in an 8 oz tube should be installed using A/C Oil Injector, J 45037. Refer to the HVAC Section of Service Information for detailed information on Oil Balancing and Capacities. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant Oil > Component Information > Specifications > Capacity Specifications Refrigerant Oil: Capacity Specifications REFRIGERANT OIL CAPACITIES Accumulator Replacement .................................................................................................................. .................................................. 60 ml (2.0 ounces) NOTE: Add PAG oil equal to the amount of oil drained from the old accumulator plus the specified additional amount. Compressor Replacement ................................................................................................................... .................................................. 60 ml (2.0 ounces) NOTE: If more than the specified amount of oil was drained from a component, add the equal amount of oil drained. A Sanden scroll compressor containing 240 ml of oil is used on this model year. NOTE: If more than the specified amount of oil was drained from a component, add the equal amount of oil drained. Condenser Replacement ..................................................................................................................... .................................................. 30 ml (1.0 ounces) NOTE: If more than the specified amount of oil was drained from a component, add the equal amount of oil drained. Evaporator Replacement ..................................................................................................................... ................................................. 90 ml (3.0 ounces) NOTE: If more than the specified amount of oil was drained from a component, add the equal amount of oil drained. Total System Oil Capacity ................................................................................................................... ............................................... 240 ml (8.0 ounces) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant Oil > Component Information > Specifications > Capacity Specifications > Page 3239 Refrigerant Oil: Fluid Type Specifications REFRIGERANT OIL PAG Oil GM P/N 12345923 (Canadian P/N 10953486) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fluids > Refrigerant Oil > Component Information > Specifications > Page 3240 Refrigerant Oil: Service and Repair A/C REFRIGERANT SYSTEM OIL CHARGE REPLENISHING If oil was removed from the A/C system during the recovery process or due to component replacement, the oil must be replenished. Oil can be injected into a charged system using J 45037. For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Capacities. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure Brake Bleeding: Service and Repair Antilock Brake System Automated Bleed Procedure ABS Automated Bleed Procedure Two - Person Procedure Important: ^ Use the two-person bleed procedure under the following conditions: ^ Installing a new Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV). ^ Air is trapped in the valve body. ^ Do not drive the vehicle until the brake pedal feels firm. ^ Do not reuse brake fluid that is used during bleeding. ^ Use the vacuum, the pressure and the gravity bleeding procedures only for base brake bleeding. 1. Raise the vehicle in order to access the system bleed screws. 2. Bleed the system at the right rear wheel first. 3. Install a clear hose on the bleed screw. 4. Immerse the opposite end of the hose into a container partially filled with clean DOT 3 brake fluid. 5. Open the bleed screw 1/2 to 1 full turn. 6. Slowly depress the brake pedal. While the pedal is depressed to its full extent, tighten the bleed screw. 7. Release the brake pedal and wait 10-15 seconds for the master cylinder pistons to return to the home position. 8. Repeat the previous steps for the remaining wheels. The brake fluid which is present at each bleed screw should be clean and free of air. 9. This procedure may use more than a pint of fluid per wheel. Check the master cylinder fluid level every four to six strokes of the brake pedal in order to avoid running the system dry. 10. Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure. Release the brake pedal between each test. 11. Bleed all four wheels again using Steps 3-9. This will remove the remaining air from the brake system. 12. Evaluate the feel of the brake pedal before attempting to drive the vehicle. 13. Bleed the system as many times as necessary in order to obtain the appropriate feel of the pedal. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure > Page 3245 Brake Bleeding: Service and Repair Hydraulic Brake System Bleeding Manual Hydraulic Brake System Bleeding (Manual) Caution: Refer to Brake Fluid Irritant Caution in Service Precautions. Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Cautions and Notices. Notice: When adding fluid to the brake master cylinder reservoir, use only Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components. 1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills. 2. With the ignition Off and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve. 3. If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps: 1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal. 2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder. 3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder. 4. Reconnect the brake pipe to the master cylinder port and tighten securely. 5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal. 6. Loosen the same brake pipe to purge air from the open port of the master cylinder. 7. Tighten the brake pipe, then have the assistant slowly release the brake pedal. 8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder. 9. With the front brake pipe installed securely to the master cylinder - after all air has been purged from the front port of the master cylinder loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8. 10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened. 4. Fill the brake master cylinder reservoir with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure. Add fluid as needed to maintain the proper level.Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm. 5. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve. 6. Install a transparent hose over the end of the bleeder valve. 7. Submerge the open end of the transparent hose into a transparent container partially filled with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 8. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal. 9. Loosen the bleeder valve to purge air from the wheel hydraulic circuit. 10. Tighten the bleeder valve, then have the assistant slowly release the brake pedal. 11. Wait 15 seconds, then repeat steps 8-10 until all air is purged from the same wheel hydraulic circuit. 12. With the right rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right rear hydraulic circuit - install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve. 13. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11. 14. With the left rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the left rear hydraulic circuit - install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve. 15. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11. 16. With the right front wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right front hydraulic circuit install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve. 17. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11. 18. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened. 19. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 20. Slowly depress and release the brake pedal. Observe the feel of the brake pedal. 21. If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure, perform the following steps: 1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection. See: Brakes and Traction Control/Hydraulic Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure > Page 3246 System/Testing and Inspection/Component Tests and General Diagnostics/Brake System External Leak Inspection 2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system. 22. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated. Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired. 23. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes. See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Symptom Related Diagnostic Procedures Pressure Hydraulic Brake System Bleeding (Pressure) ^ Tools Required J 29532 Diaphragm Type Brake Pressure Bleeder, or equivalent - J 35589-A Brake Pressure Bleeder Adapter Caution: Refer to Brake Fluid Irritant Caution in Service Precautions. Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Service Precautions. Notice: When adding fluid to the brake master cylinder reservoir, use only Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components. 1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills. 2. With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve. 3. If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps: 1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal. 2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder. 3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder. 4. Reconnect the brake pipe to the master cylinder port and tighten securely. 5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal. 6. Loosen the same brake pipe to purge air from the open port of the master cylinder. 7. Tighten the brake pipe, then have the assistant slowly release the brake pedal. 8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder. 9. With the front brake pipe installed securely to the master cylinder - after all air has been purged from the front port of the master cylinder loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8. 10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened. 4. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm. 5. Install the J 35589-A to the brake master cylinder reservoir. 6. Check the brake fluid level in the J 29532, or equivalent. Add Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container as necessary to bring the level to approximately the half-full point. 7. Connect the J 29532, or equivalent, to the J 35589-A. 8. Charge the J 29532, or equivalent, air tank to 175 - 205 kPa (25 - 30 psi). 9. Open the J 29532, or equivalent, fluid tank valve to allow pressurized brake fluid to enter the brake system. 10. Wait approximately 30 seconds, then inspect the entire hydraulic brake system in order to ensure that there are no existing external brake fluid leaks. Any brake fluid leaks identified require repair prior to completing this procedure. 11. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve. 12. Install a transparent hose over the end of the bleeder valve. 13. Submerge the open end of the transparent hose into a transparent container partially filled with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 14. Loosen the bleeder valve to purge air from the wheel hydraulic circuit. Allow fluid to flow until air bubbles stop flowing from the bleeder, then tighten the bleeder valve. 15. With the right rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right rear hydraulic circuit install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve. 16. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14. 17. With the left rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the left rear hydraulic circuit - install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure > Page 3247 18. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14. 19. With the right front wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right front hydraulic circuit install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve. 20. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14. 21. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened. 22. Close the J 29532, or equivalent, fluid tank valve, then disconnect the J 29532, or equivalent, from the J 35589-A. 23. Remove the J 35589-A from the brake master cylinder reservoir. 24. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 25. Slowly depress and release the brake pedal. Observe the feel of the brake pedal. 26. If the brake pedal feels spongy perform the following steps: 1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection. See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Component Tests and General Diagnostics/Brake System External Leak Inspection 2. Using a scan tool, perform the antilock brake system automated bleeding procedure to remove any air that may have been trapped in the BPMV. Refer to ABS Automated Bleed Procedure. 27. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated. Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired. 28. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes. See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Symptom Related Diagnostic Procedures Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Air Bag(s) Arming and Disarming > System Information > Service and Repair Air Bag(s) Arming and Disarming: Service and Repair SIR DISABLING AND ENABLING SIR component location affects how a vehicle should be serviced. There are parts of the SIR system installed in various locations around a vehicle. To find the location of the SIR components refer to SIR Identification Views. There are several reasons for disabling the SIR system, such as repairs to the SIR system or servicing a component near or attached to an SIR component. There are several ways to disable the SIR system depending on what type of service is being performed. The information covers the proper procedures for disabling/enabling the SIR system. SIR Service Precautions Caution:When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Failure to observe the correct procedure could cause deployment of the SIR components. Serious injury can occur. Failure to observe the correct procedure could also result in unnecessary SIR system repairs. The inflatable restraint sensing and diagnostic module (5DM) maintains a reserved energy supply. The reserved energy supply provides deployment power for the air bags if the SDM loses battery power during a collision. Deployment power is available for as much as 1 minute after disconnecting the vehicle power. Waiting 1 minute before working on the system after disabling the SIR system prevents deployment of the air bags from the reserved energy supply. General Service Instructions The following are general service instructions which must be followed in order to properly repair the vehicle and return it to its original integrity: 1. Do not expose inflator modules to temperatures above 65°c( 150°F). 2. Verify the correct replacement part number. Do not substitute a component from a different vehicle. 3. Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the SIR system. 4. Discard any of the following components if it has been dropped from a height of 91 cm (3 ft) or greater: ^ Inflatable restraint SDM ^ Any Inflatable restraint air bag module ^ Inflatable restraint steering wheel module coil ^ Any Inflatable restraint sensor ^ Inflatable restraint seat belt pretensioners ^ Inflatable restraint passenger presence system (PPS) module or sensor Disabling Procedure - Air Bag Fuse 1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead. 2. Place the ignition in the OFF position. Important: The SDM may have more than one fused power input. To ensure there is no unwanted SIR deployment, personal injury, or unnecessary SIR system repairs, remove all fuses supplying power to the 5DM. With all 5DM fuses removed and the ignition switch in the ON position, the AIR BAG warning indicator illuminates. This is normal operation, and does not indicate a SIR system malfunction. 3. Locate and remove the fuse(s) supplying power to the SDM. Refer to SIR Diagrams.See: Restraint Systems/Air Bag Systems/Diagrams 4. Wait 1 minute before working on the system. Enabling Procedure - Air Bag Fuse Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Air Bag(s) Arming and Disarming > System Information > Service and Repair > Page 3251 1. Place the ignition in the OFF position. 2. Install the fuse(s) supplying power to the SDM. Refer to SIR Diagrams See: Restraint Systems/Air Bag Systems/Diagrams 3. Turn the ignition switch to the ON position. The AIR BAG indicator will flash then turn OFF. 4. Perform the Diagnostic System Check - Vehicle if the AIR BAG warning indicator does not operate as described. Refer to Diagnostic System Check - Vehicle See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures Disabling Procedure - Negative Battery Cable 1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead. 2. Place the ignition in the OFF position. 3. Disconnect the negative battery cable from the battery. Refer to Battery Negative Cable Disconnect/Connect Procedure.See: Starting and Charging/Battery/Battery Cable/Negative/Service and Repair 4. Wait 1 minute before working on system. Enabling Procedure - Negative Battery Cable 1. Place the ignition in the OFF position. 2. Connect the negative battery cable to the battery. Refer to Battery/Negative Cable Disconnect/Connect Procedure. See: Starting and Charging/Battery/Battery Cable/Negative/Service and Repair 3. Turn the ignition switch to the ON position. The AIR BAG indicator will flash then turn OFF. 4. Perform the Diagnostic System Check - Vehicle if the AIR BAG warning indicator does not operate as described. Refer to Diagnostic System~ Check - VehicleSee: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Technical Service Bulletins > Electrical - Aftermarket Fuse Warning Fuse: Technical Service Bulletins Electrical - Aftermarket Fuse Warning Bulletin No.: 07-08-45-002 Date: September 05, 2007 ADVANCED SERVICE INFORMATION Subject: Service Alert: Concerns With Aftermarket Fuses in GM Vehicles Models: 2008 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2008 and Prior HUMMER H2, H3 2008 and Prior Saab 9-7X Concerns with Harbor Freight Tools "Storehouse" Branded Blade Type Fuses General Motors has become aware of a fuse recall by Harbor Freight Tools/Storehouse for a variety of aftermarket fuses. In two cases, these fuses have not provided protection for the wiring system of the vehicles they were customer installed in. Upon testing the 15 amp version, it was found that the fuse still would not "open" when shorted directly across the battery terminals. How to Identify These Fuses Packed in a 120 piece set, the fuse has a translucent, hard plastic, blue body with the amperage stamped into the top. There are no white painted numbers on the fuse to indicate amperage. There are no identifying marks on the fuse to tell who is making it. The fuses are known to be distributed by Harbor Freight Tools but there may be other marketers, and packaging of this style of fuse. It would be prudent to replace these fuses if found in a customers vehicle. Likewise, if wiring overheating is found you should check the fuse panel for the presence of this style of fuse. All GM dealers should use genuine GM fuses on the vehicles they service. You should also encourage the use of GM fuses to your customers to assure they are getting the required electrical system protection. GM has no knowledge of any concerns with other aftermarket fuses. If additional information becomes available, this bulletin will be updated. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood Fuse: Locations Fuse Block - Underhood Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3259 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3260 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3261 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3262 Fuse: Locations Fuse Block - Rear (Short Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3263 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3264 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3265 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3266 Fuse: Locations Fuse Block - Rear (Long Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3267 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3268 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Locations > Fuse Block - Underhood > Page 3269 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions Fuse: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3272 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3273 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3274 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3275 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3276 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3277 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3278 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3279 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3280 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3281 Fuse: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3282 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3283 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3284 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3285 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3286 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3287 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3288 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3289 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3290 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3291 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3292 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3293 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3294 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3295 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3296 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3297 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3298 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3299 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3300 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3301 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3302 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3303 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3304 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3305 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3306 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3307 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3308 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3309 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3310 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3311 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3312 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3313 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3314 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3315 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3316 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3317 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3318 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3319 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3320 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3321 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3322 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3323 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3324 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3325 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3326 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3327 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3328 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3329 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3330 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3331 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3332 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3333 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3334 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3335 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3336 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3337 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3338 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3339 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3340 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3341 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3342 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3343 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Diagrams > Diagram Information and Instructions > Page 3344 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood Fuse: Application and ID Fuse Block - Underhood Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3347 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3348 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3349 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3350 Fuse: Application and ID Fuse Block - Rear (Short Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3351 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3352 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3353 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3354 Fuse: Application and ID Fuse Block - Rear (Long Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3355 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3356 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse > Component Information > Application and ID > Fuse Block - Underhood > Page 3357 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions Fuse Block: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3362 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3363 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3364 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3365 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3366 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3367 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3368 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3369 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3370 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3371 Fuse Block: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3372 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3373 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3374 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3375 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3376 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3377 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3378 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3379 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3380 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3381 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3382 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3383 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3384 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3385 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3386 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3387 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3388 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3389 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3390 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3391 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3392 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3393 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3394 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3395 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3396 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3397 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3398 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3399 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3400 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3401 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3402 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3403 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3404 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3405 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3406 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3407 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3408 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3409 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3410 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3411 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3412 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3413 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3414 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3415 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3416 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3417 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3418 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3419 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3420 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3421 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3422 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3423 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3424 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3425 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3426 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3427 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3428 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3429 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3430 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3431 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3432 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3433 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3434 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3435 Fuse Block: Connector Views Fuse Block - Underhood C1 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3436 Fuse Block - Underhood C1 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3437 Fuse Block - Underhood C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3438 Fuse Block - Underhood C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3439 Fuse Block - Underhood C2 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3440 Fuse Block - Underhood C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3441 Fuse Block - Underhood C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3442 Fuse Block - Underhood C4 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3443 Fuse Block - Underhood C4 (Part 2) Fuse Block - Underhood C5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3444 Fuse Block - Underhood C7 Fuse Block - Underhood C8 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3445 Fuse Block - Underhood C9 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3446 Fuse Block - Rear C1 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3447 Fuse Block - Rear C1 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3448 Fuse Block - Rear C1 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3449 Fuse Block - Rear C1 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3450 Fuse Block - Rear C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3451 Fuse Block - Rear C2 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3452 Fuse Block - Rear C2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3453 Fuse Block - Rear C4 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Diagrams > Diagram Information and Instructions > Page 3454 Fuse Block - Rear C4 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement Fuse Block: Service and Repair Rear Electrical Center or Junction Block Replacement REAR ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. Refer to Seat Replacement - Rear No. 1 (TrailBlazer EXT, Envoy XL) in Seats. 3. If replacing the rear electrical center on a Chevrolet TrailBlazer or GMC Envoy, position the left second row seat to a cargo position. 4. Remove the rear electrical center cover. 5. Remove the battery feed terminal nut (2) from the junction block. 6. Remove the body control module (BCM) from the rear electrical center. Refer to Body Control Module Replacement in Computer/Integrating Systems. 7. Fully loosen the 3 bolts (1) that retain the junction block to the electrical connectors. 8. Release the tabs that retain the junction block to the block base. 9. Remove the junction block from the block base. 10. Disconnect the instrument panel harness connector (1) from the junction block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3457 11. Disconnect the mobile telephone harness connector (1) from the junction block. 12. Disconnect the body wiring harness connector (1) from the junction block. 13. Disconnect the headliner harness connector (2) from the junction block. 14. Disconnect the console harness connector from the junction block. 15. Remove the block base retaining nuts from the floor studs. 16. Remove the block base from the floor panel. INSTALLATION PROCEDURE 1. Install the block base to the floor studs. 2. Install the block base retaining nuts to the floor studs. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the block base retaining nuts to 10 N.m (88 lb in). 3. Connect the console harness connector to the block base. 4. Connect the headliner harness connector (2) to the block base. 5. Connect the body wiring harness connector (1) to the block base. 6. Connect the mobile telephone harness connector (1) to the junction block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3458 7. Connect the instrument panel harness connector (1) to the block base. 8. Install the junction block to the block base.Ensure that the retaining tabs are fully seated. 9. Install the 3 bolts (1) that retain the junction block to the block base. Tighten the 3 bolts to 3.5 N.m (31 lb in). 10. Install the BCM to the rear electrical center. Refer to Body Control Module Replacement in Computer/Integrating Systems. 11. Install the battery feed terminal nut (2) to the junction block. Tighten the battery feed terminal nut to 10 N.m (88 lb in). 12. Install the rear electrical center cover. 13. If replacing the rear electrical center on a Chevrolet TrailBlazer or GMC Envoy, position the left second row seat to a passenger position. 14. If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. Refer to Seat Replacement - Rear No. 1 (TrailBlazer EXT, Envoy XL) in Seats. 15. Connect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3459 Fuse Block: Service and Repair Underhood Electrical Center or Junction Block Replacement UNDERHOOD ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. 2. Press tabs (1) inward and lift to remove the junction block cover. 3. Pull upward on the fuse relay center cover (1) to release the retaining tabs and remove the cover. 4. Note the location and remove the harness end bolts (2) and remove the harness ends from the fuse relay center. 5. Remove the fuse relay center bolts (3) and remove the fuse relay center from the junction block bracket. 6. Pull downward on the wiring harness ends to remove from the bottom of the fuse relay center. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3460 7. Remove the junction block bracket retaining bolts (1) and remove the junction block bracket from the vehicle. INSTALLATION PROCEDURE 1. Position the junction block bracket and install the bolts (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the junction block bracket bolts to 6 N.m (53 lb in). 2. Align the wiring harnesses and install the fuse relay center. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Fuse Block > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3461 3. Install the fuse relay center bolts (3). Tighten the relay center bolts to 6 N.m (53 lb in). 4. Install the harness end bolts (2). 5. Install the fuse relay center cover (1) over the relay center bolts. Press downward to engage the tabs. 6. Install the junction block cover. Press downward to engage the tabs. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood Relay Box: Application and ID Fuse Block - Underhood Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3466 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3467 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3468 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3469 Relay Box: Application and ID Fuse Block - Rear (Short Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3470 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3471 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3472 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3473 Relay Box: Application and ID Fuse Block - Rear (Long Wheel Base), Label Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3474 Application Table (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3475 Application Table (Part 2) Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Application and ID > Fuse Block - Underhood > Page 3476 Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement Relay Box: Service and Repair Rear Electrical Center or Junction Block Replacement REAR ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. Refer to Seat Replacement - Rear No. 1 (TrailBlazer EXT, Envoy XL) in Seats. 3. If replacing the rear electrical center on a Chevrolet TrailBlazer or GMC Envoy, position the left second row seat to a cargo position. 4. Remove the rear electrical center cover. 5. Remove the battery feed terminal nut (2) from the junction block. 6. Remove the body control module (BCM) from the rear electrical center. Refer to Body Control Module Replacement in Computer/Integrating Systems. 7. Fully loosen the 3 bolts (1) that retain the junction block to the electrical connectors. 8. Release the tabs that retain the junction block to the block base. 9. Remove the junction block from the block base. 10. Disconnect the instrument panel harness connector (1) from the junction block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3479 11. Disconnect the mobile telephone harness connector (1) from the junction block. 12. Disconnect the body wiring harness connector (1) from the junction block. 13. Disconnect the headliner harness connector (2) from the junction block. 14. Disconnect the console harness connector from the junction block. 15. Remove the block base retaining nuts from the floor studs. 16. Remove the block base from the floor panel. INSTALLATION PROCEDURE 1. Install the block base to the floor studs. 2. Install the block base retaining nuts to the floor studs. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the block base retaining nuts to 10 N.m (88 lb in). 3. Connect the console harness connector to the block base. 4. Connect the headliner harness connector (2) to the block base. 5. Connect the body wiring harness connector (1) to the block base. 6. Connect the mobile telephone harness connector (1) to the junction block. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3480 7. Connect the instrument panel harness connector (1) to the block base. 8. Install the junction block to the block base.Ensure that the retaining tabs are fully seated. 9. Install the 3 bolts (1) that retain the junction block to the block base. Tighten the 3 bolts to 3.5 N.m (31 lb in). 10. Install the BCM to the rear electrical center. Refer to Body Control Module Replacement in Computer/Integrating Systems. 11. Install the battery feed terminal nut (2) to the junction block. Tighten the battery feed terminal nut to 10 N.m (88 lb in). 12. Install the rear electrical center cover. 13. If replacing the rear electrical center on a Chevrolet TrailBlazer or GMC Envoy, position the left second row seat to a passenger position. 14. If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. Refer to Seat Replacement - Rear No. 1 (TrailBlazer EXT, Envoy XL) in Seats. 15. Connect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3481 Relay Box: Service and Repair Underhood Electrical Center or Junction Block Replacement UNDERHOOD ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging. 2. Press tabs (1) inward and lift to remove the junction block cover. 3. Pull upward on the fuse relay center cover (1) to release the retaining tabs and remove the cover. 4. Note the location and remove the harness end bolts (2) and remove the harness ends from the fuse relay center. 5. Remove the fuse relay center bolts (3) and remove the fuse relay center from the junction block bracket. 6. Pull downward on the wiring harness ends to remove from the bottom of the fuse relay center. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3482 7. Remove the junction block bracket retaining bolts (1) and remove the junction block bracket from the vehicle. INSTALLATION PROCEDURE 1. Position the junction block bracket and install the bolts (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the junction block bracket bolts to 6 N.m (53 lb in). 2. Align the wiring harnesses and install the fuse relay center. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Fuses and Circuit Breakers > Relay Box > Component Information > Service and Repair > Rear Electrical Center or Junction Block Replacement > Page 3483 3. Install the fuse relay center bolts (3). Tighten the relay center bolts to 6 N.m (53 lb in). 4. Install the harness end bolts (2). 5. Install the fuse relay center cover (1) over the relay center bolts. Press downward to engage the tabs. 6. Install the junction block cover. Press downward to engage the tabs. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips Low Tire Pressure Indicator: Technical Service Bulletins Tire Pressure Monitor - TPM System Message/Service Tips # 09-03-16-002A: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information - (Apr 27, 2010) Subject: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information Models: 2006-2011 Cars and Light Duty Trucks (Including Saturn and Saab) 2006-2010 HUMMER H2, H3 ATTENTION The information found in this bulletin is to be used as a dealership service consultant procedures for customers coming into the service lane with an illuminated "low tire light" or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. Maintaining proper tire pressures is an Owner's Maintenance item and is not covered under warranty. This bulletin is being revised to add model years and update additional bulletin reference information. Please discard Corporate Bulletin Number 09-03-16-002 (Section 03 -- Suspension). Customer Concerns and Confusion with the Tire Pressure Monitoring (TPM) System The following procedure should be used by dealership service consultants when a customer comes into the service drive with a "low tire light" on or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. The service consultant should perform the following steps: Procedure Turn the key to ON, without starting the engine. ^ If the low tire light comes on and stays on solid with a check tire pressure/low tire pressure/add air to tire message (on vehicles equipped with DIC), advise the customer: - The system is working properly. - Properly adjusting all tire air pressures to the recommended levels and driving the vehicle will turn the light off (refer to the Tire and Loading Information label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". ^ If the Tire Pressure Monitor (TPM) light blinks for one minute then stays on solid with a service tire monitor system message (on vehicles equipped with DIC): - A TPM system problem exists. The vehicle should be written up accordingly and sent to your service department for further DTC diagnosis and service. - If dashes (--) are displayed in only one or two of the tire pressure readouts, it is likely caused by a previous TPM system relearn that was performed incorrectly due to interference from another vehicle's TPM system during the relearn process (refer to the Important statement later in this bulletin regarding TPM relearn with a Tech 2(R)). - If dashes (--) are displayed in all four of the tire pressure readouts, there is a system problem. Follow the appropriate SI service procedures. ^ If a customer indicates the low tire light comes on for a few minutes when the vehicle is started, then goes off after driving a while, advise the customer: - The system is working properly. - Most likely, air pressure in one or more of the tires is low enough to turn the light on when tires are cold. After driving for a while, tires will heat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3489 up, allowing tire air pressure to increase above the threshold causing the light to go off. Properly adjusting all tire air pressures to the recommended levels will correct this (Refer to the Tire and Loading Information Label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". For more detailed information, refer to Corporate Bulletin Number 07-03-16-004C and TPMS Training Course 13044.12T2. Tire Pressure Light At key on, without starting the vehicle: Steady Solid Glowing TPM Indicator If the TPM indicator appears as a steady glowing yellow lamp (as above), the system is functioning properly and you should add air to the tires to correct this condition. Blinking TPM Indicator If the TPM indicator appears as a BLINKING yellow lamp for one minute and then stays on solid, diagnostic service is needed. The Effect of Outside Temperature on Tire Pressures Important: As a rule of thumb, tire pressure will change about 7kPa (1 psi) for every 6°C (10°F) decrease in temperature - Tire pressure will drop when it gets colder outside, and rise when it gets warmer. Under certain situations such as extreme outside temperature changes, the system may bring on a solid light with a check tire pressure message. This should be considered normal and the system is working properly. The light will turn off upon adding the proper amount of air to the tires (refer to the Tire & Loading Information label in the driver's door opening). When properly adjusting tire air pressure, the following steps are important to help optimize the system and prolong bringing a tire pressure light on: ^ Use an accurate, high quality tire pressure gauge. ^ Never set the tire pressure below the specified placard value regardless of tire temperature or ambient temperature. ^ Tire pressure should be set to the specified placard pressure at the lowest seasonal temperature the vehicle will encounter during operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3490 ^ When adding proper tire air pressure, it is important to remember fluctuations in outside air temperatures and tire temperatures effect tire air pressures. ^ After you have added the proper tire pressure, if the vehicle has a DIC (after the system has updated), check to see if DIC displays are the same readings as the tire pressure gauge used (adjust as necessary). ^ Only perform a TPM sensor re-learn after a tire rotation or system part replacements and use the Tech 2(R) to initiate the relearn whenever possible to avoid invalid sensor I.D. learns. Important: Always take outside temperature and tire temperature into consideration to properly set tire pressures. Foe example, on colder days (20°F/-7°C), if setting tire pressure when the vehicle has been indoors (60°F/16°C) or the tires are warm from being driven, it will be necessary to compensate for the low outside temperature by adding 21-27 kPa (3-4 psi) more then the placecard pressure. At some later time, when the vehicle has been parked outside for a while, the tires will cool off and the pressures will drop back into the placecard range. Important: Recently, nitrogen gas (for use in inflating tires) has become available to the general customer through some retailers. The use of nitrogen gas to inflate tires is a technology used in automobile racing. Tires inflated with nitrogen gas may exhibit less of a pressure change in response to outside temperature changes. Nitrogen gas inflation is compatible with GM TPM sensors. For additional information, refer to Corporate Service Bulletin 05-03-10-020C. Important: All Models (Except the Pontiac Vibe): Do not perform a TPM relearn at PDI, the system has already been set at the Assembly Plant. Do not perform a TPM relearn after adding air to the tires. The low tire light is similar to the low fuel indicator and adding something (fuel, air) to the vehicle makes that light turn back off again. Note that because of system behavior, some vehicles must be driven a short distance before the sensors recognize the increase in pressure and turns the light off again. Pontiac Vibe Only: Do not use the TPMS reset button to turn off the light. The system will update and light will turn off when all tire pressures have been adjusted followed by short distance drive. Important: All models (except the Pontiac Vibe): Each tire monitor sensor is learned to a specific vehicle corner. When performing a TPM relearn (only after a tire rotation or replacement of a TPM sensor or Module), always use the Tech2(R) to initiate the J 46079 relearned process. Tech 2(R) - initiated relearns lock out other vehicle TPM signals that may be broadcasting in the area. Only signals initiated by the J 46079 tool will be accepted. This method avoids storing false TPM I.D.s and will prevent customers from returning with dashes (--) displayed in tire pressure readouts and/or a flashing tire pressure monitor (TPM) light. Checking the four TPM I.D.s with the Tech 2(R) prior to and following relearn to verify they are the same can prevent invalid I.D. learns. Pontiac Vibe Only: Tire Monitor Sensors are not learned to a specific vehicle corner. Do not perform a TPM Reset after tire rotation. The TPMS Reset button must only be used during pre-delivery inspection by the dealer to initialize the system (after all tire pressures have been adjusted properly) or when a Tire Pressure Monitor System component is replaced. The J 46079 tool does not work on Vibe TPM sensors. A TPMS relearn on Vibe must be preformed with a Tech 2(R) to set the TPMS Module in learn mode. The TPMS sensor IDs are entered through the Tech 2(R). Refer to SI for further Vibe TPMS information. Labor Operation and Repair Order/Warranty System Claim Required Documentation Important: The ONLY time labor operation E0726 or E0722 should be used is to diagnose for a system issue. That should ONLY occur if, at key ON, without starting the engine, the Tire Pressure Monitor (TPM) blinks for one minute and then stays on solid with a Service Tire Monitor System message (on vehicles equipped with a DIC) If that occurs, a TPM system problem exists and the system will have set a DTC. If one of these operastions is used, the following Repair Order and Warranty System documentation are required: ^ Document the customer complaint on the Repair Order. ^ Document the TPMS DTC that has set on the Repair Order. ^ Enter the TPMS DTC in the Warranty System (WINS) in the Failure Code/DTC field on the claim submission (refer to the Claims Processing Manual, Section IV, Warranty claim Data, Page 6, Item G). If the above information is not documented on the Repair Order and Warranty System, the claim may be rejected. If the Warranty Parts Center (WPC) generates a request, this repair order documentation must be sent back. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3491 Customer TPMS Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3492 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3493 Frequently Asked Questions Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Page 3494 Low Tire Pressure Indicator: Description and Operation TIRE PRESSURE SENSOR LEARN TOOLS REQUIRED J-46079 Tire Pressure Monitor Diagnostic Tool TPM LEARN MODE DESCRIPTION The tire pressure monitor (TPM) system uses the endgate module (EGM) with power sliding rear roof, liftgate module (LGM) without power sliding roof, body control module (BCM), exterior lamp switch, 4 RF transmitting pressure sensors, and the serial data circuit to perform the TPM learn mode functions. The sensor learn procedure must be performed after every tire rotation, EGM/LGM replacement, or sensor replacement. Once the TPM learn mode has been enabled, each of the sensor unique identification (Id) codes can be learned into the EGM/LGM memory. When a sensor Id has been learned, the EGM/LGM sends a serial data message to the BCM to sound a horn chirp. This verifies the sensor has transmitted its Id and the EGM/LGM has received and learned it. The EGM/LGM must learn the sensor Ids in the proper order to determine correct sensor location. The first learned Id is assigned to the left front location, the second to right front, the third to right rear, and the fourth to left rear. SENSOR FUNCTIONS USING PRESSURE INCREASE/DECREASE METHOD Each sensor takes a pressure measurement sample once every 30 seconds while in stationary mode. If the tire pressure increases, or decreases by more than 1.6 psi from the last transmitted pressure, another measurement will occur immediately to verify the change in pressure. If a pressure change has indeed occurred, the sensor transmits in re-measure mode. When the EGM/LGM receives a re-measure mode transmission while in TPM learn mode, it will assign that sensor Id to the location on the vehicle relative to the order in which it was learned. SENSOR FUNCTIONS USING J-46079 Each sensor has an internal low frequency (LF) coil. When the J-46079 is used in activate mode, it produces an LF transmission that activates the sensor. The sensor responds to a LF activation by transmitting in learn mode. When the EGM/LGM receives a learn mode transmission while in TPM learn mode, it will assign that sensor Id to the location on the vehicle relative to the order in which it was learned. TPM LEARN MODE CANCELLATION The learn mode will cancel if more than 2 minutes have passed and no sensor have been learned, or if more than 5 minutes has passed for the entire procedure. If the learn mode is canceled before any Ids are learned, the EGM/LGM will remember all previously stored Ids and their locations. As soon as the EGM/LGM learns the first Id, all other Ids are erased from the EGM/LGM memory. IMPORTANT: Before proceeding with the steps below, ensure that no other sensor learn procedure is being performed simultaneously, or that tire pressures are not being adjusted on a TPM equipped vehicle within close proximity. 1. Turn "ON" the ignition, with the engine "OFF". 2. Apply the parking brake. IMPORTANT: If the learn mode cannot be enabled, ensure the TPM system is enabled in the EGM/LGM. 3. Cycle the exterior lamp switch from "OFF" to parking lamps 4 times within 4 seconds. A double horn chirp will sound and the low tire pressure indicator will begin to flash indicating the learn mode has been enabled. CAUTION: Over inflating tires may cause personal injury or damage to the tires and wheels. When increasing tire pressure do not exceed the maximum inflation pressure as noted on the tire sidewall. 4. Starting with the left front tire, hold the antenna of the J-46079 against the tire sidewall close to the wheel rim at the valve stem location then press and release the activate button and wait for a horn chirp, or increase/decrease the tire pressure for 8-10 seconds then wait for a horn chirp. The horn chirp may occur before the 8-10 second pressure increase/decrease time period has been reached, or up to 30 seconds after the 8-10 second pressure increase/decrease time period has been reached. 5. After the horn chirp has sounded, proceed as in step 4 for the next 3 sensors in the following order: - Right front - Right rear - Left rear 6. After the LR sensor has been learned, turn "OFF" the ignition to exit the learn mode. 7. After the learn mode has been exited, adjust all tire pressures to the recommended psi. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Maintenance Required Lamp/Indicator > Component Information > Description and Operation Maintenance Required Lamp/Indicator: Description and Operation SERVICE VEHICLE SOON INDICATOR The "SERVICE VEHICLE SOON" light, (if equipped) will come on if there are certain non-emission related vehicle problems. These problems may not be obvious and may affect vehicle performance or durability. The light will come on briefly when the ignition is turned on to show that it is working properly. This light does NOT come on at certain mileage intervals. There is probably a PCM or a BCM Code set that will aid you in diagnosis. RESET PROCEDURE The only way to get the light to go off is to clear the PCM or BCM code(s). This light can NOT be reset or shut off any other way. PCM/BCM codes should be read & repaired before clearing them. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Malfunction Indicator Lamp > Component Information > Description and Operation Malfunction Indicator Lamp: Description and Operation MALFUNCTION INDICATOR LAMP (MIL) OPERATION The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON: The MIL indicates that an emissions related fault has occurred and vehicle service is required. The following is a list of the modes of operation for the MIL: - The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate. - The MIL turns OFF after the engine is started if a diagnostic fault is not present. - The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate. - The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter. - When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON. - When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On Malfunction Indicator Lamp: Testing and Inspection Malfunction Indicator Lamp (MIL) Always On MALFUNCTION INDICATOR LAMP (MIL) ALWAYS ON CIRCUIT DESCRIPTION Battery positive voltage is supplied directly to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit. MIL OPERATION The MIL is located on the instrument panel (IPC). MIL FUNCTION - The MIL informs the driver that a malfunction has occurred and the vehicle should be taken in for service as soon as possible. - The MIL illuminates during a bulb test and a system test. - A DTC will be stored if a MIL is requested by the diagnostic. MIL ILLUMINATION - The MIL will illuminate with ignition switch ON and the engine not running. - The MIL will turn OFF when the engine is started. - The MIL will remain ON if the self-diagnostic system has detected a malfunction. - The MIL may turn OFF if the malfunction is not present. - If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated so long as the ignition switch is ON. - If the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition switch is cycled OFF, then ON. DIAGNOSTIC AIDS If the problem is intermittent, refer to Testing for Intermittent Conditions and Poor Connections. See: Testing and Inspection/Component Tests and General Diagnostics TEST DESCRIPTION Step 1 - Step 6 The number below refers to the step number on the diagnostic table. 2. This step determines if the condition is with the MIL control circuit or the ECM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On > Page 3503 Malfunction Indicator Lamp: Testing and Inspection Malfunction Indicator Lamp (MIL) Inoperative MALFUNCTION INDICATOR LAMP (MIL) INOPERATIVE CIRCUIT DESCRIPTION Ignition voltage is supplied to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit. There should be a steady MIL with the ignition ON and the engine OFF. MIL OPERATION The MIL is located on the instrument panel cluster (IPC). MIL FUNCTION - The MIL informs the driver that a malfunction has occurred and the vehicle should be taken in for service as soon as possible. - The MIL illuminates during a bulb test and a system test. - A DTC will be stored if a MIL is requested by the ECM. MIL ILLUMINATION - The MIL will illuminate with ignition switch ON and the engine not running. - The MIL will turn OFF when the engine is started. - The MIL will remain ON if the self-diagnostic system has detected a malfunction. - The MIL may turn OFF if the malfunction is not present. - If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated so long as the ignition switch is ON. - If the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition switch is cycled OFF, then ON. TEST DESCRIPTION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On > Page 3504 Step 1 - Step 14 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On > Page 3505 Step 15 The number below refers to the step number on the diagnostic table. 4. This step tests for a short to voltage on the MIL control circuit. With the fuse removed there should be no voltage on the MIL control circuit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Service Reminder Indicators > Oil Change Reminder Lamp > Component Information > Service and Repair Oil Change Reminder Lamp: Service and Repair ENGINE OIL LIFE SYSTEM WHEN TO CHANGE ENGINE OIL Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions and engine temperature, and not on mileage. Based on driving conditions, the mileage at which an oil change will be indicated can vary considerably. For the oil life system to work properly, you must reset the system every time the oil is changed. When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A "change engine oil" light will come on, or, if your vehicle has a Driver Information Center (DIC), a "CHANGE ENGINE OIL" message will come. Change your oil as soon as possible within the next 600 miles (1 000 km). It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change is necessary for over a year. However, the engine oil and filter must be changed at least once a year and at this time the system must be reset. It is also important to check the oil regularly and keep it at the proper level. If the system is ever reset accidentally, you must change your oil at 3,000 miles (5 000 km) since the last oil change. Remember to reset the oil life system whenever the oil is changed. HOW TO RESET THE ENGINE OIL LIFE SYSTEM The Engine Oil Life System calculates when to change your engine oil and filter based on vehicle use. Anytime your oil is changed, reset the system so it can calculate when the next oil change is required. If a situation occurs where you change your oil prior to a "change engine oil" light or "CHANGE ENGINE OIL" message being turned on, reset the system. To reset the Engine Oil Life System, do the following: 1. Turn the ignition key to "RUN" with the engine off. 2. Fully press and release the accelerator pedal slowly three times within five seconds. 3. Turn the key to "LOCK". If the light/message comes back on when you start the vehicle, the engine oil life system has not reset. Repeat the procedure. WHAT TO DO WITH USED OIL Used engine oil contains certain elements that may be unhealthy for your skin and could even cause cancer. Do not let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly dispose of clothing or rags containing used engine oil. See the manufacturer's warnings about the use and disposal of oil products. Used oil can be a threat to the environment. If you change your own oil, be sure to drain all the oil from the filter before disposal. Never dispose of oil by putting it in the trash, pouring it on the ground, into sewers, or into streams or bodies of water. Instead, recycle it by taking it to a place that collects used oil. If you have a problem properly disposing of your used oil, ask your dealer, a service station, or a local recycling center for help. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Vehicle Lifting > Component Information > Service Precautions Vehicle Lifting: Service Precautions CAUTION: - To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed. - To avoid any vehicle damage, serious personal injury or death, always use the jackstands to support the vehicle when lifting the vehicle with a jack. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Vehicle Lifting > Component Information > Service and Repair > General Information Vehicle Lifting: Service and Repair General Information LIFTING AND JACKING THE VEHICLE CAUTION: - To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed. - To avoid any vehicle damage, serious personal injury or death, always use the jackstands to support the vehicle when lifting the vehicle with a jack. NOTE: Perform the following steps before beginning any vehicle lifting or jacking procedure: - Remove or secure all of the vehicle's contents in order to avoid any shifting or any movement that may occur during the vehicle lifting or jacking procedure. - The lifting equipment or the jacking equipment weight rating must meet or exceed the weight of the vehicle and any vehicle contents. - The lifting equipment or the jacking equipment must meet the operational standards of the lifting equipment or jacking equipment's manufacturer. - Perform the vehicle lifting or jacking procedure on a clean, hard, dry, level surface. - Perform the vehicle lifting or jacking procedure only at the identified lift points. DO NOT allow the lifting equipment or jacking equipment to contact any other vehicle components. Failure to perform the previous steps could result in damage to the lifting equipment or the jacking equipment, the vehicle, and/or the vehicle's contents. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Vehicle Lifting > Component Information > Service and Repair > General Information > Page 3515 Vehicle Lifting: Service and Repair Vehicle Jacking VEHICLE JACKING - Park the vehicle on a clean, hard, level surface before jacking the vehicle. - Any time you lift the vehicle on one end, chock the wheels at the opposite end. - Use jack stands in order to provide support. - When supporting the vehicle using jack stands, place the jack stands under the side rails or the axle. - When lifting under the rear differential, do not allow the jack pad to contact the rear stabilizer bar or mounting hardware. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Vehicle Lifting > Component Information > Service and Repair > General Information > Page 3516 Vehicle Lifting: Service and Repair Vehicle Lifting VEHICLE LIFTING - Ensure that the lifting equipment meets weight requirements and is in good working order. Always follow the lift manufacturer's instructions. - You may lift and support the front of the vehicle at the front suspension near the wheel assemblies. Ensure that the arms of the front cradle are extended as close to the steering knuckle as possible. - Ensure that the vehicle is centered on the hoist before attempting to lift. - When using a suspension-contact hoist, ensure that the rear cradle has adequate clearance for the rear stabilizer bar. - When lifting or jacking a vehicle, be certain that the lift pads do not contact the exhaust system, brake pipes, cables, HVAC lines, wiring harnesses, fuel lines, or underbody. Such contact may result in damage or unsatisfactory vehicle performance. - When using a frame-contact hoist, only place the pads on flat surfaces. Do not place pads within 50 mm (2 in) of any radius. - Before lifting the vehicle, verify that the vehicle loads are secure and equally distributed. - When major components are removed from the vehicle when supported on a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and secure the vehicle frame to the hoist pads nearest the component to be removed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Relays and Modules - Wheels and Tires > Tire Pressure Module > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs Tire Pressure Module: Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Relays and Modules - Wheels and Tires > Tire Pressure Monitor Receiver / Transponder > Component Information > Technical Service Bulletins > Tire Monitor System - TPM Sensor Information Tire Pressure Monitor Receiver / Transponder: Technical Service Bulletins Tire Monitor System TPM Sensor Information INFORMATION Bulletin No.: 08-03-16-003 Date: May 12, 2008 Subject: Warranty Reduction - Transfer of Tire Pressure Monitoring (TPM) Sensors to Replacement Wheels and Allowable TPM Sensor Replacements Models: 2000-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7x with On-Wheel TPM Sensors TPM Sensor / Wheel Warranty Reviews During the last warranty review period it was noted that wheels being returned under the GM New Vehicle Warranty were being shipped back to General Motors with the TPM sensor still attached to the wheel. Return rates ran as high as 60% with the TPM sensors still attached. Operational TPM sensors should not be returned to GM and are to be transferred to replacement wheels if they become necessary. Important: Operational TPM Sensors that are returned under warranty to General Motors will be charged back to the dealer.Sensors have a 10 year /150,000 mile (240,000 km) battery life, and should be transferred if one or more wheels are replaced. TPM Valve Stem / Grommet (0-ring) Replacement When the TPM sensors are transferred to new wheels you should replace the component used to seal the TPM sensor stem to the wheel. On sensors with an aluminum stem and visible nut on the outside of the wheel a replacement grommet (0-ring) should be used to assure a proper seal. The sensor retaining nut (except Aveo) should be tightened to 7 N.m (62 lb in) for all vehicles except Pontiac Vibe (4.0 N.m (35.4 lb in)). Important: ^ DO NOT overtorque the retaining nut. Notice: ^ Factory installed TPM Sensors come with plastic aluminum or nickel-plated brass stem caps. These caps should not be changed. Chrome plated steel caps may cause corrosion of aluminum valve stems due to incompatibility of the metals. On current style sensors the entire rubber stem is replaceable. The service interval on the revised TPM sensor with replaceable stem is the same as for any other traditional valve stem. Replace the stem at the time of tire replacement sensor transfer or whenever air seepage is suspected at the valve stem. When replacing the valve stem tighten the screw to 1.3 N.m (11.5 lb in). For either style of TPM sensor see the service parts guide for the correct GM part numbers to order and use. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs Tire Pressure Sensor: Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3531 Tire Pressure Sensor: Technical Service Bulletins Tire Monitor System - TPM Sensor Information INFORMATION Bulletin No.: 08-03-16-003 Date: May 12, 2008 Subject: Warranty Reduction - Transfer of Tire Pressure Monitoring (TPM) Sensors to Replacement Wheels and Allowable TPM Sensor Replacements Models: 2000-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7x with On-Wheel TPM Sensors TPM Sensor / Wheel Warranty Reviews During the last warranty review period it was noted that wheels being returned under the GM New Vehicle Warranty were being shipped back to General Motors with the TPM sensor still attached to the wheel. Return rates ran as high as 60% with the TPM sensors still attached. Operational TPM sensors should not be returned to GM and are to be transferred to replacement wheels if they become necessary. Important: Operational TPM Sensors that are returned under warranty to General Motors will be charged back to the dealer.Sensors have a 10 year /150,000 mile (240,000 km) battery life, and should be transferred if one or more wheels are replaced. TPM Valve Stem / Grommet (0-ring) Replacement When the TPM sensors are transferred to new wheels you should replace the component used to seal the TPM sensor stem to the wheel. On sensors with an aluminum stem and visible nut on the outside of the wheel a replacement grommet (0-ring) should be used to assure a proper seal. The sensor retaining nut (except Aveo) should be tightened to 7 N.m (62 lb in) for all vehicles except Pontiac Vibe (4.0 N.m (35.4 lb in)). Important: ^ DO NOT overtorque the retaining nut. Notice: ^ Factory installed TPM Sensors come with plastic aluminum or nickel-plated brass stem caps. These caps should not be changed. Chrome plated steel caps may cause corrosion of aluminum valve stems due to incompatibility of the metals. On current style sensors the entire rubber stem is replaceable. The service interval on the revised TPM sensor with replaceable stem is the same as for any other traditional valve stem. Replace the stem at the time of tire replacement sensor transfer or whenever air seepage is suspected at the valve stem. When replacing the valve stem tighten the screw to 1.3 N.m (11.5 lb in). For either style of TPM sensor see the service parts guide for the correct GM part numbers to order and use. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3532 Tire Pressure Sensor: Technical Service Bulletins Tires - Minimizing Damage to TPM Sensors INFORMATION Bulletin No.: 08-03-10-007 Date: May 16, 2008 Subject: Minimizing Damage to Tire Pressure Monitor (TPM) Sensors During Tire Mounting/Dismounting Models: 2009 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2009 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with Wheel Mounted Tire Pressure Sensors Minimizing Damage To TPM Sensors All GM vehicles now in production and sold in the U.S., as well as many vehicles sold in Canada, feature Tire Pressure Monitoring Systems that have valve stem mounted Tire Pressure Sensors. When dismounting and mounting tires, care must be taken when breaking the bead loose from the wheel. If the tire machines bead breaking fixture is positioned too close to the tire pressure sensor, as the tire bead breaks away from the wheel it may be forced into, or catch on the edge of the tire pressure sensor. This can damage the sensor and require the sensor to be replaced. Care must also be taken when transferring the tire bead to the other side of the wheel rim. As the tire machine rotates and the tire bead is stretched around the wheel rim, the bead can come in contact with the sensor if it is not correctly positioned in relation to the mounting/dismounting head prior to tire mounting/dismounting. This can also cause sensor damage requiring replacement. Procedure Notice: Use a tire changing machine in order to dismount tires. Do not use hand tools or tire irons alone in order to remove the tire from the wheel. Damage to the tire beads or the wheel rim could result. Notice: Do not scratch or damage the clear coating on aluminum wheels with the tire changing equipment. Scratching the clear coating could cause the aluminum wheel to corrode and the clear coating to peel from the wheel. 1. Remove the valve core from the valve stem. 2. Deflate the tire completely. Important: Rim-clamp European-type tire changers are recommended. 3. Use the tire changer in order to remove the tire from the wheel. Follow steps 4-7 to remove the tire from the wheel. 4. When separating the tire bead from the wheel position the bead breaking fixture 90, 180 and 270 degrees from the valve stem. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3533 5. Position the wheel and tire so the valve stem is situated at the 2 o'clock position relative to the head. The tire iron or pry bar can be inserted when prying the outer tire bead up and over the mounting/dismounting head. 6. Position the wheel and tire so that the valve stem is situated again at the 2 o'clock position relative to the head. The tire iron or pry bar can be inserted when prying the inner tire bead up and over the mounting/dismounting head. 7. Remove all residual liquid sealant from the inside of the tire and wheel surfaces. If any tire sealant is noted upon tire dismounting on vehicles equipped with TPM replace the tire pressure sensor. 8. Use a wire brush or coarse steel wool in order to remove any rubber, light rust or corrosion from the wheel bead seats. Important: If bead seat corrosion has been identified as an air loss concern on the wheel being worked on, refer to GM Service Bulletin # 08-03-10-006 for additional information on correcting the leak. 9. Apply GM P/N 12345884 (in Canada, P/N 5728223) or equivalent to the tire bead and the wheel rim. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3534 10. Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. 11. Position the rim so that the valve stem (1) is situated at the 3 o'clock position relative to the head (2). This will protect the sensor when the bottom bead seats. 12. After the bottom bead is on the wheel, reposition the wheel and tire so that the valve stem is situated at the 9 o'clock position relative to the head. This will protect the sensor while mounting the tire bead to the outside of the wheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3535 13. Use the tire changer in order to install the tire to the wheel. Caution: To avoid serious personal injury, do not stand over tire when inflating. The bead may break when the bead snaps over the safety hump. Do not exceed 275 kPa (40 psi) pressure when inflating any tire if beads are not seated. If 275 kPa (40 psi) pressure will not seat the beads, deflate, lubricate the beads and reinflate. Overinflating may cause the bead to break and cause serious personal injury. Important: Allowable bead seating pressure is 345 kPa (50 psi) on Extended Mobility Tires. 14. Inflate the tire until it passes the bead humps. Be sure that the valve core is not installed at this time. 15. Install the valve core to the valve core stem. 16. Inflate the tire to the proper air pressure. 17. Ensure that the locating rings are visible on both sides of the tire in order to verify that the tire bead is fully seated on the wheel. Parts Information The product shown above is available from GM SPO. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement Tire Pressure Sensor: Service and Repair Tire Pressure Sensor Grommet Replacement Tire Pressure Sensor Grommet Replacement Removal Procedure 1. Raise the vehicle on a suitable support. 2. Remove the tire/wheel assembly from the vehicle. 3. Remove the tire from the wheel. Important: Before the tire is removed from the wheel, note the following items to avoid tire pressure sensor damage upon tire dismounting: ^ Place the sensors cap and valve on a dry clean surface after removal, the cap is aluminum and the valve is nickel plated to prevent corrosion and are not to be substituted with a cap or valve made of any other material. ^ Position the bead breaking fixture 90 degrees from the valve stem when separating the tire bead from the wheel. ^ Position the mounting/dismounting head so the tire iron, or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim. ^ Repeat items for inner bead. 4. Remove the tire pressure sensor nut. Important: If any tire sealant is noted upon tire dismounting, replace the sensor. Also remove all residual liquid sealant from the inside of the tire and wheel surfaces. 5. Remove the sensor from the wheel hole. 6. Remove the sensor grommet from the valve stem. Installation Procedure 1. Clean any dirt or debris from the grommet sealing areas. 2. Install the grommet on the sensor valve stem. 3. Insert the sensor in the wheel hole with the air passage facing away from the wheel. 4. Install the sensor nut and position the sensor body parallel to the inside wheel surface while torquing. Tighten the sensor nut to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 3538 5. Install the tire on the wheel. Important: Before installing the tire on the wheel, note the following items to avoid tire pressure sensor damage upon tire mounting: ^ Position the mounting/dismounting head 180 degrees from the valve stem. ^ Position the bead transition area 45 degrees counterclockwise of the valve stem. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. ^ Repeat items for outer bead. 6. Install the tire/wheel assembly on the vehicle. 7. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 3539 Tire Pressure Sensor: Service and Repair Tire Pressure Sensor Replacement Tire Pressure Sensor Replacement Removal Procedure 1. Raise the vehicle on a suitable support. 2. Remove the tire/wheel assembly from the vehicle. 3. Remove the tire from the wheel. Important: Before the tire is removed from the wheel, note the following items to avoid tire pressure sensor damage upon tire dismounting. ^ Place the sensors cap and valve on a dry clean surface after removal. The cap is aluminum and the valve is nickel plated to prevent corrosion and are not to be substituted with a cap or valve made of any other material. ^ When separating the tire bead from the wheel, position the bead breaking fixture 90 degrees from the valve stem. ^ Position the mounting/dismounting head so the tire iron, or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim. ^ Repeat items for inner bead. 4. Remove the tire pressure sensor nut. Important: If any tire sealant is noted upon tire dismounting, remove all residual liquid sealant from the inside of the tire and wheel surfaces. 5. Remove the tire pressure sensor. Installation Procedure 1. Clean any dirt or debris from the grommet sealing area. 2. Insert the sensor in the wheel hole with the air passage facing away from the wheel. 3. Install the sensor nut and position the sensor body parallel to the inside wheel surface while torquing. Tighten the sensor nut to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Install the tire on the wheel. Important: Before reinstalling the tire on the wheel, note the following items to avoid tire pressure sensor damage upon tire mounting. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Sensors and Switches - Wheels and Tires > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 3540 ^ Position the mounting/dismounting head 180 degrees from the valve stem. ^ Position the bead transition area 45 degrees counterclockwise of the valve stem. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. ^ Repeat items for outer bead. 5. Install the tire/wheel assembly on the vehicle. Important: A service replacement tire pressure sensor is shipped in OFF mode. In this mode the sensor's unique identification code cannot be learned into the passenger door modules (PDMs) memory. The sensor must be taken out of OFF mode by spinning the tire/wheel assembly above 32 km/h (20 mph) in order to close the sensors internal roll switch for at least 10 seconds. 6. Lower the vehicle. 7. Learn the tire pressure sensors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips Low Tire Pressure Indicator: Technical Service Bulletins Tire Pressure Monitor - TPM System Message/Service Tips # 09-03-16-002A: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information - (Apr 27, 2010) Subject: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information Models: 2006-2011 Cars and Light Duty Trucks (Including Saturn and Saab) 2006-2010 HUMMER H2, H3 ATTENTION The information found in this bulletin is to be used as a dealership service consultant procedures for customers coming into the service lane with an illuminated "low tire light" or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. Maintaining proper tire pressures is an Owner's Maintenance item and is not covered under warranty. This bulletin is being revised to add model years and update additional bulletin reference information. Please discard Corporate Bulletin Number 09-03-16-002 (Section 03 -- Suspension). Customer Concerns and Confusion with the Tire Pressure Monitoring (TPM) System The following procedure should be used by dealership service consultants when a customer comes into the service drive with a "low tire light" on or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. The service consultant should perform the following steps: Procedure Turn the key to ON, without starting the engine. ^ If the low tire light comes on and stays on solid with a check tire pressure/low tire pressure/add air to tire message (on vehicles equipped with DIC), advise the customer: - The system is working properly. - Properly adjusting all tire air pressures to the recommended levels and driving the vehicle will turn the light off (refer to the Tire and Loading Information label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". ^ If the Tire Pressure Monitor (TPM) light blinks for one minute then stays on solid with a service tire monitor system message (on vehicles equipped with DIC): - A TPM system problem exists. The vehicle should be written up accordingly and sent to your service department for further DTC diagnosis and service. - If dashes (--) are displayed in only one or two of the tire pressure readouts, it is likely caused by a previous TPM system relearn that was performed incorrectly due to interference from another vehicle's TPM system during the relearn process (refer to the Important statement later in this bulletin regarding TPM relearn with a Tech 2(R)). - If dashes (--) are displayed in all four of the tire pressure readouts, there is a system problem. Follow the appropriate SI service procedures. ^ If a customer indicates the low tire light comes on for a few minutes when the vehicle is started, then goes off after driving a while, advise the customer: - The system is working properly. - Most likely, air pressure in one or more of the tires is low enough to turn the light on when tires are cold. After driving for a while, tires will heat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3546 up, allowing tire air pressure to increase above the threshold causing the light to go off. Properly adjusting all tire air pressures to the recommended levels will correct this (Refer to the Tire and Loading Information Label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". For more detailed information, refer to Corporate Bulletin Number 07-03-16-004C and TPMS Training Course 13044.12T2. Tire Pressure Light At key on, without starting the vehicle: Steady Solid Glowing TPM Indicator If the TPM indicator appears as a steady glowing yellow lamp (as above), the system is functioning properly and you should add air to the tires to correct this condition. Blinking TPM Indicator If the TPM indicator appears as a BLINKING yellow lamp for one minute and then stays on solid, diagnostic service is needed. The Effect of Outside Temperature on Tire Pressures Important: As a rule of thumb, tire pressure will change about 7kPa (1 psi) for every 6°C (10°F) decrease in temperature - Tire pressure will drop when it gets colder outside, and rise when it gets warmer. Under certain situations such as extreme outside temperature changes, the system may bring on a solid light with a check tire pressure message. This should be considered normal and the system is working properly. The light will turn off upon adding the proper amount of air to the tires (refer to the Tire & Loading Information label in the driver's door opening). When properly adjusting tire air pressure, the following steps are important to help optimize the system and prolong bringing a tire pressure light on: ^ Use an accurate, high quality tire pressure gauge. ^ Never set the tire pressure below the specified placard value regardless of tire temperature or ambient temperature. ^ Tire pressure should be set to the specified placard pressure at the lowest seasonal temperature the vehicle will encounter during operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3547 ^ When adding proper tire air pressure, it is important to remember fluctuations in outside air temperatures and tire temperatures effect tire air pressures. ^ After you have added the proper tire pressure, if the vehicle has a DIC (after the system has updated), check to see if DIC displays are the same readings as the tire pressure gauge used (adjust as necessary). ^ Only perform a TPM sensor re-learn after a tire rotation or system part replacements and use the Tech 2(R) to initiate the relearn whenever possible to avoid invalid sensor I.D. learns. Important: Always take outside temperature and tire temperature into consideration to properly set tire pressures. Foe example, on colder days (20°F/-7°C), if setting tire pressure when the vehicle has been indoors (60°F/16°C) or the tires are warm from being driven, it will be necessary to compensate for the low outside temperature by adding 21-27 kPa (3-4 psi) more then the placecard pressure. At some later time, when the vehicle has been parked outside for a while, the tires will cool off and the pressures will drop back into the placecard range. Important: Recently, nitrogen gas (for use in inflating tires) has become available to the general customer through some retailers. The use of nitrogen gas to inflate tires is a technology used in automobile racing. Tires inflated with nitrogen gas may exhibit less of a pressure change in response to outside temperature changes. Nitrogen gas inflation is compatible with GM TPM sensors. For additional information, refer to Corporate Service Bulletin 05-03-10-020C. Important: All Models (Except the Pontiac Vibe): Do not perform a TPM relearn at PDI, the system has already been set at the Assembly Plant. Do not perform a TPM relearn after adding air to the tires. The low tire light is similar to the low fuel indicator and adding something (fuel, air) to the vehicle makes that light turn back off again. Note that because of system behavior, some vehicles must be driven a short distance before the sensors recognize the increase in pressure and turns the light off again. Pontiac Vibe Only: Do not use the TPMS reset button to turn off the light. The system will update and light will turn off when all tire pressures have been adjusted followed by short distance drive. Important: All models (except the Pontiac Vibe): Each tire monitor sensor is learned to a specific vehicle corner. When performing a TPM relearn (only after a tire rotation or replacement of a TPM sensor or Module), always use the Tech2(R) to initiate the J 46079 relearned process. Tech 2(R) - initiated relearns lock out other vehicle TPM signals that may be broadcasting in the area. Only signals initiated by the J 46079 tool will be accepted. This method avoids storing false TPM I.D.s and will prevent customers from returning with dashes (--) displayed in tire pressure readouts and/or a flashing tire pressure monitor (TPM) light. Checking the four TPM I.D.s with the Tech 2(R) prior to and following relearn to verify they are the same can prevent invalid I.D. learns. Pontiac Vibe Only: Tire Monitor Sensors are not learned to a specific vehicle corner. Do not perform a TPM Reset after tire rotation. The TPMS Reset button must only be used during pre-delivery inspection by the dealer to initialize the system (after all tire pressures have been adjusted properly) or when a Tire Pressure Monitor System component is replaced. The J 46079 tool does not work on Vibe TPM sensors. A TPMS relearn on Vibe must be preformed with a Tech 2(R) to set the TPMS Module in learn mode. The TPMS sensor IDs are entered through the Tech 2(R). Refer to SI for further Vibe TPMS information. Labor Operation and Repair Order/Warranty System Claim Required Documentation Important: The ONLY time labor operation E0726 or E0722 should be used is to diagnose for a system issue. That should ONLY occur if, at key ON, without starting the engine, the Tire Pressure Monitor (TPM) blinks for one minute and then stays on solid with a Service Tire Monitor System message (on vehicles equipped with a DIC) If that occurs, a TPM system problem exists and the system will have set a DTC. If one of these operastions is used, the following Repair Order and Warranty System documentation are required: ^ Document the customer complaint on the Repair Order. ^ Document the TPMS DTC that has set on the Repair Order. ^ Enter the TPMS DTC in the Warranty System (WINS) in the Failure Code/DTC field on the claim submission (refer to the Claims Processing Manual, Section IV, Warranty claim Data, Page 6, Item G). If the above information is not documented on the Repair Order and Warranty System, the claim may be rejected. If the Warranty Parts Center (WPC) generates a request, this repair order documentation must be sent back. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3548 Customer TPMS Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3549 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3550 Frequently Asked Questions Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Low Tire Pressure Indicator > Component Information > Technical Service Bulletins > Page 3551 Low Tire Pressure Indicator: Description and Operation TIRE PRESSURE SENSOR LEARN TOOLS REQUIRED J-46079 Tire Pressure Monitor Diagnostic Tool TPM LEARN MODE DESCRIPTION The tire pressure monitor (TPM) system uses the endgate module (EGM) with power sliding rear roof, liftgate module (LGM) without power sliding roof, body control module (BCM), exterior lamp switch, 4 RF transmitting pressure sensors, and the serial data circuit to perform the TPM learn mode functions. The sensor learn procedure must be performed after every tire rotation, EGM/LGM replacement, or sensor replacement. Once the TPM learn mode has been enabled, each of the sensor unique identification (Id) codes can be learned into the EGM/LGM memory. When a sensor Id has been learned, the EGM/LGM sends a serial data message to the BCM to sound a horn chirp. This verifies the sensor has transmitted its Id and the EGM/LGM has received and learned it. The EGM/LGM must learn the sensor Ids in the proper order to determine correct sensor location. The first learned Id is assigned to the left front location, the second to right front, the third to right rear, and the fourth to left rear. SENSOR FUNCTIONS USING PRESSURE INCREASE/DECREASE METHOD Each sensor takes a pressure measurement sample once every 30 seconds while in stationary mode. If the tire pressure increases, or decreases by more than 1.6 psi from the last transmitted pressure, another measurement will occur immediately to verify the change in pressure. If a pressure change has indeed occurred, the sensor transmits in re-measure mode. When the EGM/LGM receives a re-measure mode transmission while in TPM learn mode, it will assign that sensor Id to the location on the vehicle relative to the order in which it was learned. SENSOR FUNCTIONS USING J-46079 Each sensor has an internal low frequency (LF) coil. When the J-46079 is used in activate mode, it produces an LF transmission that activates the sensor. The sensor responds to a LF activation by transmitting in learn mode. When the EGM/LGM receives a learn mode transmission while in TPM learn mode, it will assign that sensor Id to the location on the vehicle relative to the order in which it was learned. TPM LEARN MODE CANCELLATION The learn mode will cancel if more than 2 minutes have passed and no sensor have been learned, or if more than 5 minutes has passed for the entire procedure. If the learn mode is canceled before any Ids are learned, the EGM/LGM will remember all previously stored Ids and their locations. As soon as the EGM/LGM learns the first Id, all other Ids are erased from the EGM/LGM memory. IMPORTANT: Before proceeding with the steps below, ensure that no other sensor learn procedure is being performed simultaneously, or that tire pressures are not being adjusted on a TPM equipped vehicle within close proximity. 1. Turn "ON" the ignition, with the engine "OFF". 2. Apply the parking brake. IMPORTANT: If the learn mode cannot be enabled, ensure the TPM system is enabled in the EGM/LGM. 3. Cycle the exterior lamp switch from "OFF" to parking lamps 4 times within 4 seconds. A double horn chirp will sound and the low tire pressure indicator will begin to flash indicating the learn mode has been enabled. CAUTION: Over inflating tires may cause personal injury or damage to the tires and wheels. When increasing tire pressure do not exceed the maximum inflation pressure as noted on the tire sidewall. 4. Starting with the left front tire, hold the antenna of the J-46079 against the tire sidewall close to the wheel rim at the valve stem location then press and release the activate button and wait for a horn chirp, or increase/decrease the tire pressure for 8-10 seconds then wait for a horn chirp. The horn chirp may occur before the 8-10 second pressure increase/decrease time period has been reached, or up to 30 seconds after the 8-10 second pressure increase/decrease time period has been reached. 5. After the horn chirp has sounded, proceed as in step 4 for the next 3 sensors in the following order: - Right front - Right rear - Left rear 6. After the LR sensor has been learned, turn "OFF" the ignition to exit the learn mode. 7. After the learn mode has been exited, adjust all tire pressures to the recommended psi. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Module > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs Tire Pressure Module: Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Monitor Receiver / Transponder > Component Information > Technical Service Bulletins > Tire Monitor System - TPM Sensor Information Tire Pressure Monitor Receiver / Transponder: Technical Service Bulletins Tire Monitor System TPM Sensor Information INFORMATION Bulletin No.: 08-03-16-003 Date: May 12, 2008 Subject: Warranty Reduction - Transfer of Tire Pressure Monitoring (TPM) Sensors to Replacement Wheels and Allowable TPM Sensor Replacements Models: 2000-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7x with On-Wheel TPM Sensors TPM Sensor / Wheel Warranty Reviews During the last warranty review period it was noted that wheels being returned under the GM New Vehicle Warranty were being shipped back to General Motors with the TPM sensor still attached to the wheel. Return rates ran as high as 60% with the TPM sensors still attached. Operational TPM sensors should not be returned to GM and are to be transferred to replacement wheels if they become necessary. Important: Operational TPM Sensors that are returned under warranty to General Motors will be charged back to the dealer.Sensors have a 10 year /150,000 mile (240,000 km) battery life, and should be transferred if one or more wheels are replaced. TPM Valve Stem / Grommet (0-ring) Replacement When the TPM sensors are transferred to new wheels you should replace the component used to seal the TPM sensor stem to the wheel. On sensors with an aluminum stem and visible nut on the outside of the wheel a replacement grommet (0-ring) should be used to assure a proper seal. The sensor retaining nut (except Aveo) should be tightened to 7 N.m (62 lb in) for all vehicles except Pontiac Vibe (4.0 N.m (35.4 lb in)). Important: ^ DO NOT overtorque the retaining nut. Notice: ^ Factory installed TPM Sensors come with plastic aluminum or nickel-plated brass stem caps. These caps should not be changed. Chrome plated steel caps may cause corrosion of aluminum valve stems due to incompatibility of the metals. On current style sensors the entire rubber stem is replaceable. The service interval on the revised TPM sensor with replaceable stem is the same as for any other traditional valve stem. Replace the stem at the time of tire replacement sensor transfer or whenever air seepage is suspected at the valve stem. When replacing the valve stem tighten the screw to 1.3 N.m (11.5 lb in). For either style of TPM sensor see the service parts guide for the correct GM part numbers to order and use. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs Tire Pressure Sensor: Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3564 Tire Pressure Sensor: Technical Service Bulletins Tire Monitor System - TPM Sensor Information INFORMATION Bulletin No.: 08-03-16-003 Date: May 12, 2008 Subject: Warranty Reduction - Transfer of Tire Pressure Monitoring (TPM) Sensors to Replacement Wheels and Allowable TPM Sensor Replacements Models: 2000-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7x with On-Wheel TPM Sensors TPM Sensor / Wheel Warranty Reviews During the last warranty review period it was noted that wheels being returned under the GM New Vehicle Warranty were being shipped back to General Motors with the TPM sensor still attached to the wheel. Return rates ran as high as 60% with the TPM sensors still attached. Operational TPM sensors should not be returned to GM and are to be transferred to replacement wheels if they become necessary. Important: Operational TPM Sensors that are returned under warranty to General Motors will be charged back to the dealer.Sensors have a 10 year /150,000 mile (240,000 km) battery life, and should be transferred if one or more wheels are replaced. TPM Valve Stem / Grommet (0-ring) Replacement When the TPM sensors are transferred to new wheels you should replace the component used to seal the TPM sensor stem to the wheel. On sensors with an aluminum stem and visible nut on the outside of the wheel a replacement grommet (0-ring) should be used to assure a proper seal. The sensor retaining nut (except Aveo) should be tightened to 7 N.m (62 lb in) for all vehicles except Pontiac Vibe (4.0 N.m (35.4 lb in)). Important: ^ DO NOT overtorque the retaining nut. Notice: ^ Factory installed TPM Sensors come with plastic aluminum or nickel-plated brass stem caps. These caps should not be changed. Chrome plated steel caps may cause corrosion of aluminum valve stems due to incompatibility of the metals. On current style sensors the entire rubber stem is replaceable. The service interval on the revised TPM sensor with replaceable stem is the same as for any other traditional valve stem. Replace the stem at the time of tire replacement sensor transfer or whenever air seepage is suspected at the valve stem. When replacing the valve stem tighten the screw to 1.3 N.m (11.5 lb in). For either style of TPM sensor see the service parts guide for the correct GM part numbers to order and use. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3565 Tire Pressure Sensor: Technical Service Bulletins Tires - Minimizing Damage to TPM Sensors INFORMATION Bulletin No.: 08-03-10-007 Date: May 16, 2008 Subject: Minimizing Damage to Tire Pressure Monitor (TPM) Sensors During Tire Mounting/Dismounting Models: 2009 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2009 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with Wheel Mounted Tire Pressure Sensors Minimizing Damage To TPM Sensors All GM vehicles now in production and sold in the U.S., as well as many vehicles sold in Canada, feature Tire Pressure Monitoring Systems that have valve stem mounted Tire Pressure Sensors. When dismounting and mounting tires, care must be taken when breaking the bead loose from the wheel. If the tire machines bead breaking fixture is positioned too close to the tire pressure sensor, as the tire bead breaks away from the wheel it may be forced into, or catch on the edge of the tire pressure sensor. This can damage the sensor and require the sensor to be replaced. Care must also be taken when transferring the tire bead to the other side of the wheel rim. As the tire machine rotates and the tire bead is stretched around the wheel rim, the bead can come in contact with the sensor if it is not correctly positioned in relation to the mounting/dismounting head prior to tire mounting/dismounting. This can also cause sensor damage requiring replacement. Procedure Notice: Use a tire changing machine in order to dismount tires. Do not use hand tools or tire irons alone in order to remove the tire from the wheel. Damage to the tire beads or the wheel rim could result. Notice: Do not scratch or damage the clear coating on aluminum wheels with the tire changing equipment. Scratching the clear coating could cause the aluminum wheel to corrode and the clear coating to peel from the wheel. 1. Remove the valve core from the valve stem. 2. Deflate the tire completely. Important: Rim-clamp European-type tire changers are recommended. 3. Use the tire changer in order to remove the tire from the wheel. Follow steps 4-7 to remove the tire from the wheel. 4. When separating the tire bead from the wheel position the bead breaking fixture 90, 180 and 270 degrees from the valve stem. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3566 5. Position the wheel and tire so the valve stem is situated at the 2 o'clock position relative to the head. The tire iron or pry bar can be inserted when prying the outer tire bead up and over the mounting/dismounting head. 6. Position the wheel and tire so that the valve stem is situated again at the 2 o'clock position relative to the head. The tire iron or pry bar can be inserted when prying the inner tire bead up and over the mounting/dismounting head. 7. Remove all residual liquid sealant from the inside of the tire and wheel surfaces. If any tire sealant is noted upon tire dismounting on vehicles equipped with TPM replace the tire pressure sensor. 8. Use a wire brush or coarse steel wool in order to remove any rubber, light rust or corrosion from the wheel bead seats. Important: If bead seat corrosion has been identified as an air loss concern on the wheel being worked on, refer to GM Service Bulletin # 08-03-10-006 for additional information on correcting the leak. 9. Apply GM P/N 12345884 (in Canada, P/N 5728223) or equivalent to the tire bead and the wheel rim. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3567 10. Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. 11. Position the rim so that the valve stem (1) is situated at the 3 o'clock position relative to the head (2). This will protect the sensor when the bottom bead seats. 12. After the bottom bead is on the wheel, reposition the wheel and tire so that the valve stem is situated at the 9 o'clock position relative to the head. This will protect the sensor while mounting the tire bead to the outside of the wheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Technical Service Bulletins > TPMS System - Service And Re-Learning Sensor IDs > Page 3568 13. Use the tire changer in order to install the tire to the wheel. Caution: To avoid serious personal injury, do not stand over tire when inflating. The bead may break when the bead snaps over the safety hump. Do not exceed 275 kPa (40 psi) pressure when inflating any tire if beads are not seated. If 275 kPa (40 psi) pressure will not seat the beads, deflate, lubricate the beads and reinflate. Overinflating may cause the bead to break and cause serious personal injury. Important: Allowable bead seating pressure is 345 kPa (50 psi) on Extended Mobility Tires. 14. Inflate the tire until it passes the bead humps. Be sure that the valve core is not installed at this time. 15. Install the valve core to the valve core stem. 16. Inflate the tire to the proper air pressure. 17. Ensure that the locating rings are visible on both sides of the tire in order to verify that the tire bead is fully seated on the wheel. Parts Information The product shown above is available from GM SPO. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement Tire Pressure Sensor: Service and Repair Tire Pressure Sensor Grommet Replacement Tire Pressure Sensor Grommet Replacement Removal Procedure 1. Raise the vehicle on a suitable support. 2. Remove the tire/wheel assembly from the vehicle. 3. Remove the tire from the wheel. Important: Before the tire is removed from the wheel, note the following items to avoid tire pressure sensor damage upon tire dismounting: ^ Place the sensors cap and valve on a dry clean surface after removal, the cap is aluminum and the valve is nickel plated to prevent corrosion and are not to be substituted with a cap or valve made of any other material. ^ Position the bead breaking fixture 90 degrees from the valve stem when separating the tire bead from the wheel. ^ Position the mounting/dismounting head so the tire iron, or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim. ^ Repeat items for inner bead. 4. Remove the tire pressure sensor nut. Important: If any tire sealant is noted upon tire dismounting, replace the sensor. Also remove all residual liquid sealant from the inside of the tire and wheel surfaces. 5. Remove the sensor from the wheel hole. 6. Remove the sensor grommet from the valve stem. Installation Procedure 1. Clean any dirt or debris from the grommet sealing areas. 2. Install the grommet on the sensor valve stem. 3. Insert the sensor in the wheel hole with the air passage facing away from the wheel. 4. Install the sensor nut and position the sensor body parallel to the inside wheel surface while torquing. Tighten the sensor nut to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 3571 5. Install the tire on the wheel. Important: Before installing the tire on the wheel, note the following items to avoid tire pressure sensor damage upon tire mounting: ^ Position the mounting/dismounting head 180 degrees from the valve stem. ^ Position the bead transition area 45 degrees counterclockwise of the valve stem. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. ^ Repeat items for outer bead. 6. Install the tire/wheel assembly on the vehicle. 7. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 3572 Tire Pressure Sensor: Service and Repair Tire Pressure Sensor Replacement Tire Pressure Sensor Replacement Removal Procedure 1. Raise the vehicle on a suitable support. 2. Remove the tire/wheel assembly from the vehicle. 3. Remove the tire from the wheel. Important: Before the tire is removed from the wheel, note the following items to avoid tire pressure sensor damage upon tire dismounting. ^ Place the sensors cap and valve on a dry clean surface after removal. The cap is aluminum and the valve is nickel plated to prevent corrosion and are not to be substituted with a cap or valve made of any other material. ^ When separating the tire bead from the wheel, position the bead breaking fixture 90 degrees from the valve stem. ^ Position the mounting/dismounting head so the tire iron, or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim. ^ Repeat items for inner bead. 4. Remove the tire pressure sensor nut. Important: If any tire sealant is noted upon tire dismounting, remove all residual liquid sealant from the inside of the tire and wheel surfaces. 5. Remove the tire pressure sensor. Installation Procedure 1. Clean any dirt or debris from the grommet sealing area. 2. Insert the sensor in the wheel hole with the air passage facing away from the wheel. 3. Install the sensor nut and position the sensor body parallel to the inside wheel surface while torquing. Tighten the sensor nut to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Install the tire on the wheel. Important: Before reinstalling the tire on the wheel, note the following items to avoid tire pressure sensor damage upon tire mounting. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tire Monitoring System > Tire Pressure Sensor > Component Information > Service and Repair > Tire Pressure Sensor Grommet Replacement > Page 3573 ^ Position the mounting/dismounting head 180 degrees from the valve stem. ^ Position the bead transition area 45 degrees counterclockwise of the valve stem. ^ Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim. ^ Repeat items for outer bead. 5. Install the tire/wheel assembly on the vehicle. Important: A service replacement tire pressure sensor is shipped in OFF mode. In this mode the sensor's unique identification code cannot be learned into the passenger door modules (PDMs) memory. The sensor must be taken out of OFF mode by spinning the tire/wheel assembly above 32 km/h (20 mph) in order to close the sensors internal roll switch for at least 10 seconds. 6. Lower the vehicle. 7. Learn the tire pressure sensors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > Recalls: > NHTSA05V552000 > Dec > 05 > Recall 05V552000: Tire Label Non-Compliance Tires: Recalls Recall 05V552000: Tire Label Non-Compliance MAKE/MODELS: MODEL/BUILD YEARS: Buick/Rainier 2006 Buick/Terraza 2006 Cadillac/Escalade 2006 Cadillac/Escalade ESV 2006 Cadillac/Escalade EXT 2006 Chevrolet/Avalanche 2006 Chevrolet/Colorado 2006 Chevrolet/Express 2006 Chevrolet/Silverado 2006 Chevrolet/SSR 2006 Chevrolet/Suburban 2006 Chevrolet/Tahoe 2006 Chevrolet/Trailblazer 2006 Chevrolet/Trailblazer EXT 2006 Chevrolet/Uplander 2006 GMC/Canyon 2006 GMC/Envoy 2006 GMC/Savana 2006 GMC/Sierra 2006 GMC/Yukon 2006 GMC/Yukon XL 2006 Hummer/H2 2006 Hummer/H3 2006 Isuzu/Ascender 2006 Pontiac/Montana SV6 2006 Saturn/Relay 2006 MANUFACTURER: General Motors Corp. NHTSA CAMPAIGN ID NUMBER: 05V552000 MFG'S REPORT DATE: December 05, 2005 COMPONENT: Equipment: Other: Labels POTENTIAL NUMBER OF UNITS AFFECTED: 32068 SUMMARY: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > Recalls: > NHTSA05V552000 > Dec > 05 > Recall 05V552000: Tire Label Non-Compliance > Page 3582 Certain trucks and sport utility vehicles fail to conform to the requirements of Federal Motor Vehicle Safety Standard No. 110, "TIRE SELECTION AND RIMS." These vehicles were shipped with tire and loading information labels listing an inacccurate vehicle capacity weight. CONSEQUENCE: A misprinted label could lead to improper vehicle loading specifications or tire inflation which could result in a tire failure, increasing the risk of a crash. REMEDY: Owners will be provided with corrected labels and installation instructions. At the customer's option, a dealer can install the label for them. The manufacturer has not yet provided an owner notification schedule. Owners should contact Buick at 1-866-608-8080, Cadillac at 1-866-982-2339, Chevrolet at 1-800-630-2438, GMC at 1-866-996-9463, Hummer at 1-800-732-5493, Pontiac at 1-800-620-7668, Saturn at 1-800-972-8876, or Isuzu at 1-800-255-6727. NOTES: GM recall No. 05109. Customers can also contact The National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to http://www.safercar.gov. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 10-03-16-001 > Jul > 10 > TPMS System - Service And Re-Learning Sensor IDs Tires: All Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures Tires: All Technical Service Bulletins Tires/Wheels - Tire Puncture Repair Procedures INFORMATION Bulletin No.: 04-03-10-001F Date: April 27, 2010 Subject: Tire Puncture Repair Procedures For All Cars and Light Duty Trucks Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 04-03-10-001E (Section 03 - Suspension). This bulletin covers puncture repair procedures for passenger car and light duty truck radial tires in the tread area only. The tire manufacturer must be contacted for its individual repair policy and whether or not the speed rating is retained after repair. Caution - Tire changing can be dangerous and should be done by trained professionals using proper tools and procedures. Always read and understand any manufacturer's warnings contained in their customers literature or molded into the tire sidewall. - Serious eye and ear injury may result from not wearing adequate eye and ear protection while repairing tires. - NEVER inflate beyond 275 kPa (40 pounds) pressure to seat beads. Some run flat tires, such as the Goodyear Extended Mobility Tire (EMT) used on the Corvette, may require more than 275 kPa (40 psi) to seat the bead. In such a case, a tire safety cage must be used. Consult the tire manufacturer for its individual repair policy. - NEVER stand, lean or reach over the assembly during inflation. Repairable area on a radial tire. Important - NEVER repair tires worn to the tread indicators 1.59 mm (2/32") remaining depth). - NEVER repair tires with a tread puncture larger than 6.35 mm (1/4"). - NEVER substitute an inner tube for a permissible or non-permissible repair. - NEVER perform an outside-in tire repair (plug only, on the wheel). - Every tire must be removed from the wheel for proper inspection and repair. - Regardless of the type of repair used, the repair must seal the inner liner and fill the injury. - Consult with repair material supplier/manufacturer for repair unit application procedures and repair tools/repair material recommendations. Three basic steps for tire puncture repair: 1. Remove the tire from the wheel for inspection and repair. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3592 2. Fill the injury (puncture) to keep moisture out. 3. Seal the inner liner with a repair unit to prevent air loss. External Inspection 1. Prior to demounting, inspect the tire surface, the valve and the wheel for the source of the leak by using a water and soap solution. Mark the injured area and totally deflate the tire by removing the valve core. 2. Demount the tire from the wheel and place the tire on a well-lighted spreader. Internal Inspection 1. Spread the beads and mark the puncture with a tire crayon. 2. Inspect the inner tire for any signs of internal damage. 3. Remove the puncturing object, noting the direction of the penetration. 4. Probe the injury with a blunt awl in order to determine the extent and direction of the injury. 5. Remove any loose foreign material from the injury. 6. Punctures exceeding 6.35 mm (1/4") should not be repaired. Cleaning 1. Clean the area around the puncture thoroughly with a proper liner cleaner, clean cloth and a scraper. This step serves to remove dirt and mold lubricants to insure proper adhesion and non-contamination of the buffing tool. 2. Refer to information on the product or manufacturer's Material Safety Data Sheet and follow guidelines for handling and disposal. Clean the Injury Channel Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3593 1. Use a proper hand reamer, carbide cutter or drill bit to ream the puncture channel from the inside of the tire in order to clean the injury. 2. Remove steel wires protruding above the liner surface to prevent damage to the repair unit. 3. Consult your repair material supplier for recommended reaming tool(s). Fill the Injury 1. It is necessary to fill the injury channel to provide back up for the repair unit and to prevent moisture from entering the tire fabric and steel wires. 2. (For combination repair/plug units skip this step.) Cement the injured channel and fill the injury from the inside of the tire with the repair plug per repair material manufacturer's recommendations. Without stretching the plug, cut the plug off just above the inside tire surface. 3. Consult your repair material supplier for proper repair material selection. Repair Unit Selection Important Do not install the repair unit in this step. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3594 1. Center the repair unit over the injury as a reference and outline an area larger than the unit so that buffing will not remove the crayon marks. 2. Remove the repair unit. 3. DO NOT overlap previous or multiple repair units. 4. Consult your repair material supplier for proper repair unit selection. Buffing 1. To prevent contamination and preserve the outline, buff within the marked area thoroughly and evenly with a low speed buffing tool using a fine wire brush or gritted rasp. 2. Buff to a smooth velvet surface (RMA #1 or #2 buffed texture). 3. Use caution not to gouge the inner liner or expose casing fabric. 4. Remove any buffing dust with a vacuum cleaner. 5. Consult your repair material supplier for a proper buffing tool. Cementing Apply chemical cement according to the repair material manufacturer's procedures. Repair Unit Application Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3595 1. The tire must be in the relaxed position when the repair unit is installed (Do not spread the beads excessively). Two-Piece Plug and Repair Units 1. If applicable, install the repair unit so that the alignment is correct. 2. Center the repair unit over the injury and stitch down thoroughly with the stitching tool, working from the center out. 3. Being careful not to stretch the plug material, cut the plug flush with the outer tread. Combination Repair/Plug Units 1. Pull the plug through the injury until the repair just reaches the liner. Stitch down thoroughly. 2. Follow the repair material manufacturer's recommendations for further installation instructions. 2. Consult your repair material supplier for the proper stitching tool. Safety Cage Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3596 Some run flat tires, such as the Goodyear Extended Mobility Tire (EMT) used on the Corvette, may require more than 275 kPa (40 psi) to seat the bead. In such a case, a tire safety cage must be used. Consult the tire manufacturer for its individual repair policy. Final Inspection 1. After remounting and inflating the tire, check both beads, the repair and the valve with a water and soap solution in order to detect leaks. 2. If the tire continues to lose air, the tire must be demounted and reinspected. 3. Balance the tire and wheel assembly. Refer to Tire and Wheel Assembly Balancing - OFF Vehicle. For additional tire puncture repair information, contact: Rubber Manufacturers Association (RMA) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 05-03-10-020C > Apr > 10 > Wheels/Tires - Use of Nitrogen Gas in Tires Tires: All Technical Service Bulletins Wheels/Tires - Use of Nitrogen Gas in Tires INFORMATION Bulletin No.: 05-03-10-020C Date: April 27, 2010 Subject: Use of Nitrogen Gas in Tires Models: 2011 and Prior GM Passenger Cars and Trucks (including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 05-03-10-020B (Section 03 - Suspension). GM's Position on the Use of Nitrogen Gas in Tires General Motors does not oppose the use of purified nitrogen as an inflation gas for tires. We expect the theoretical benefits to be reduced in practical use due to the lack of an existing infrastructure to continuously facilitate inflating tires with nearly pure nitrogen. Even occasional inflation with compressed atmospheric air will negate many of the theoretical benefits. Given those theoretical benefits, practical limitations, and the robust design of GM original equipment TPC tires, the realized benefits to our customer of inflating their tires with purified nitrogen are expected to be minimal. The Promise of Nitrogen: Under Controlled Conditions Recently, nitrogen gas (for use in inflating tires) has become available to the general consumer through some retailers. The use of nitrogen gas to inflate tires is a technology used in automobile racing. The following benefits under controlled conditions are attributed to nitrogen gas and its unique properties: - A reduction in the expected loss of Tire Pressure over time. - A reduction in the variance of Tire Pressures with temperature changes due to reduction of water vapor concentration. - A reduction of long term rubber degradation due to a decrease in oxygen concentrations. Important These are obtainable performance improvements when relatively pure nitrogen gas is used to inflate tires under controlled conditions. The Promise of Nitrogen: Real World Use Nitrogen inflation can provide some benefit by reducing gas migration (pressure loss) at the molecular level through the tire structure. NHTSA (National Highway Traffic Safety Administration) has stated that the inflation pressure loss of tires can be up to 5% a month. Nitrogen molecules are larger than oxygen molecules and, therefore, are less prone to "seeping" through the tire casing. The actual obtainable benefits of nitrogen vary, based on the physical construction and the materials used in the manufacturing of the tire being inflated. Another potential benefit of nitrogen is the reduced oxidation of tire components. Research has demonstrated that oxygen consumed in the oxidation process of the tire primarily comes from the inflation media. Therefore, it is reasonable to assume that oxidation of tire components can be reduced if the tire is inflated with pure nitrogen. However, only very small amounts of oxygen are required to begin the normal oxidation process. Even slight contamination of the tire inflation gas with compressed atmospheric air during normal inflation pressure maintenance, may negate the benefits of using nitrogen. GM Tire Quality, Technology and Focus of Importance Since 1972, General Motors has designed tires under the TPC (Tire Performance Criteria) specification system, which includes specific requirements that ensure robust tire performance under normal usage. General Motors works with tire suppliers to design and manufacture original equipment tires for GM vehicles. The GM TPC addresses required performance with respect to both inflation pressure retention, and endurance properties for original equipment tires. The inflation pressure retention requirements address availability of oxygen and oxidation concerns, while endurance requirements ensure the mechanical structure of the tire has sufficient strength. This combination has provided our customers with tires that maintain their structural integrity throughout their useful treadlife under normal operating conditions. Regardless of the inflation media for tires (atmospheric air or nitrogen), inflation pressure maintenance of tires is critical for overall tire, and ultimately, vehicle performance. Maintaining the correct inflation pressure allows the tire to perform as intended by the vehicle manufacturer in many areas, including comfort, fuel economy, stopping distance, cornering, traction, treadwear, and noise. Since the load carrying capability of a tire is related to inflation pressure, proper inflation pressure maintenance is necessary for the tire to support the load imposed by the vehicle without excessive structural Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 05-03-10-020C > Apr > 10 > Wheels/Tires - Use of Nitrogen Gas in Tires > Page 3601 degradation. Important Regardless of the inflation media for tires (atmospheric air or nitrogen), inflation pressure maintenance of tires is critical for overall tire, and ultimately, vehicle performance. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips Tires: All Technical Service Bulletins Tire Pressure Monitor - TPM System Message/Service Tips # 09-03-16-002A: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information - (Apr 27, 2010) Subject: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information Models: 2006-2011 Cars and Light Duty Trucks (Including Saturn and Saab) 2006-2010 HUMMER H2, H3 ATTENTION The information found in this bulletin is to be used as a dealership service consultant procedures for customers coming into the service lane with an illuminated "low tire light" or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. Maintaining proper tire pressures is an Owner's Maintenance item and is not covered under warranty. This bulletin is being revised to add model years and update additional bulletin reference information. Please discard Corporate Bulletin Number 09-03-16-002 (Section 03 -- Suspension). Customer Concerns and Confusion with the Tire Pressure Monitoring (TPM) System The following procedure should be used by dealership service consultants when a customer comes into the service drive with a "low tire light" on or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. The service consultant should perform the following steps: Procedure Turn the key to ON, without starting the engine. ^ If the low tire light comes on and stays on solid with a check tire pressure/low tire pressure/add air to tire message (on vehicles equipped with DIC), advise the customer: - The system is working properly. - Properly adjusting all tire air pressures to the recommended levels and driving the vehicle will turn the light off (refer to the Tire and Loading Information label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". ^ If the Tire Pressure Monitor (TPM) light blinks for one minute then stays on solid with a service tire monitor system message (on vehicles equipped with DIC): - A TPM system problem exists. The vehicle should be written up accordingly and sent to your service department for further DTC diagnosis and service. - If dashes (--) are displayed in only one or two of the tire pressure readouts, it is likely caused by a previous TPM system relearn that was performed incorrectly due to interference from another vehicle's TPM system during the relearn process (refer to the Important statement later in this bulletin regarding TPM relearn with a Tech 2(R)). - If dashes (--) are displayed in all four of the tire pressure readouts, there is a system problem. Follow the appropriate SI service procedures. ^ If a customer indicates the low tire light comes on for a few minutes when the vehicle is started, then goes off after driving a while, advise the customer: - The system is working properly. - Most likely, air pressure in one or more of the tires is low enough to turn the light on when tires are cold. After driving for a while, tires will heat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3606 up, allowing tire air pressure to increase above the threshold causing the light to go off. Properly adjusting all tire air pressures to the recommended levels will correct this (Refer to the Tire and Loading Information Label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". For more detailed information, refer to Corporate Bulletin Number 07-03-16-004C and TPMS Training Course 13044.12T2. Tire Pressure Light At key on, without starting the vehicle: Steady Solid Glowing TPM Indicator If the TPM indicator appears as a steady glowing yellow lamp (as above), the system is functioning properly and you should add air to the tires to correct this condition. Blinking TPM Indicator If the TPM indicator appears as a BLINKING yellow lamp for one minute and then stays on solid, diagnostic service is needed. The Effect of Outside Temperature on Tire Pressures Important: As a rule of thumb, tire pressure will change about 7kPa (1 psi) for every 6°C (10°F) decrease in temperature - Tire pressure will drop when it gets colder outside, and rise when it gets warmer. Under certain situations such as extreme outside temperature changes, the system may bring on a solid light with a check tire pressure message. This should be considered normal and the system is working properly. The light will turn off upon adding the proper amount of air to the tires (refer to the Tire & Loading Information label in the driver's door opening). When properly adjusting tire air pressure, the following steps are important to help optimize the system and prolong bringing a tire pressure light on: ^ Use an accurate, high quality tire pressure gauge. ^ Never set the tire pressure below the specified placard value regardless of tire temperature or ambient temperature. ^ Tire pressure should be set to the specified placard pressure at the lowest seasonal temperature the vehicle will encounter during operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3607 ^ When adding proper tire air pressure, it is important to remember fluctuations in outside air temperatures and tire temperatures effect tire air pressures. ^ After you have added the proper tire pressure, if the vehicle has a DIC (after the system has updated), check to see if DIC displays are the same readings as the tire pressure gauge used (adjust as necessary). ^ Only perform a TPM sensor re-learn after a tire rotation or system part replacements and use the Tech 2(R) to initiate the relearn whenever possible to avoid invalid sensor I.D. learns. Important: Always take outside temperature and tire temperature into consideration to properly set tire pressures. Foe example, on colder days (20°F/-7°C), if setting tire pressure when the vehicle has been indoors (60°F/16°C) or the tires are warm from being driven, it will be necessary to compensate for the low outside temperature by adding 21-27 kPa (3-4 psi) more then the placecard pressure. At some later time, when the vehicle has been parked outside for a while, the tires will cool off and the pressures will drop back into the placecard range. Important: Recently, nitrogen gas (for use in inflating tires) has become available to the general customer through some retailers. The use of nitrogen gas to inflate tires is a technology used in automobile racing. Tires inflated with nitrogen gas may exhibit less of a pressure change in response to outside temperature changes. Nitrogen gas inflation is compatible with GM TPM sensors. For additional information, refer to Corporate Service Bulletin 05-03-10-020C. Important: All Models (Except the Pontiac Vibe): Do not perform a TPM relearn at PDI, the system has already been set at the Assembly Plant. Do not perform a TPM relearn after adding air to the tires. The low tire light is similar to the low fuel indicator and adding something (fuel, air) to the vehicle makes that light turn back off again. Note that because of system behavior, some vehicles must be driven a short distance before the sensors recognize the increase in pressure and turns the light off again. Pontiac Vibe Only: Do not use the TPMS reset button to turn off the light. The system will update and light will turn off when all tire pressures have been adjusted followed by short distance drive. Important: All models (except the Pontiac Vibe): Each tire monitor sensor is learned to a specific vehicle corner. When performing a TPM relearn (only after a tire rotation or replacement of a TPM sensor or Module), always use the Tech2(R) to initiate the J 46079 relearned process. Tech 2(R) - initiated relearns lock out other vehicle TPM signals that may be broadcasting in the area. Only signals initiated by the J 46079 tool will be accepted. This method avoids storing false TPM I.D.s and will prevent customers from returning with dashes (--) displayed in tire pressure readouts and/or a flashing tire pressure monitor (TPM) light. Checking the four TPM I.D.s with the Tech 2(R) prior to and following relearn to verify they are the same can prevent invalid I.D. learns. Pontiac Vibe Only: Tire Monitor Sensors are not learned to a specific vehicle corner. Do not perform a TPM Reset after tire rotation. The TPMS Reset button must only be used during pre-delivery inspection by the dealer to initialize the system (after all tire pressures have been adjusted properly) or when a Tire Pressure Monitor System component is replaced. The J 46079 tool does not work on Vibe TPM sensors. A TPMS relearn on Vibe must be preformed with a Tech 2(R) to set the TPMS Module in learn mode. The TPMS sensor IDs are entered through the Tech 2(R). Refer to SI for further Vibe TPMS information. Labor Operation and Repair Order/Warranty System Claim Required Documentation Important: The ONLY time labor operation E0726 or E0722 should be used is to diagnose for a system issue. That should ONLY occur if, at key ON, without starting the engine, the Tire Pressure Monitor (TPM) blinks for one minute and then stays on solid with a Service Tire Monitor System message (on vehicles equipped with a DIC) If that occurs, a TPM system problem exists and the system will have set a DTC. If one of these operastions is used, the following Repair Order and Warranty System documentation are required: ^ Document the customer complaint on the Repair Order. ^ Document the TPMS DTC that has set on the Repair Order. ^ Enter the TPMS DTC in the Warranty System (WINS) in the Failure Code/DTC field on the claim submission (refer to the Claims Processing Manual, Section IV, Warranty claim Data, Page 6, Item G). If the above information is not documented on the Repair Order and Warranty System, the claim may be rejected. If the Warranty Parts Center (WPC) generates a request, this repair order documentation must be sent back. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3608 Customer TPMS Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3609 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3610 Frequently Asked Questions Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 07-03-10-008B > Aug > 09 > Tires - Slight/Mild Edge Feathering Information Tires: All Technical Service Bulletins Tires - Slight/Mild Edge Feathering Information INFORMATION Bulletin No.: 07-03-10-008B Date: August 13, 2009 Subject: Information on Slight or Mild Tire Feathering and Recommended Practices (Normal Tire Wear Condition) Models: 2006-2010 GM Passenger Cars and Light Duty Trucks (including Saturn) 2006-2010 HUMMER H2, H3 2006-2009 Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 07-03-10-008A (Section 03 - Suspension). This bulletin provides information regarding the normal tire wear condition of slight or mild tire feathering and recommended practices. If a vehicle comes into a dealership with a concern of slight or mild feathering-type wear on the tires, review with the customer their past tire rotation history. Tires should be rotated every 8,000 to 13,000 km (5,000 to 8,000 mi) for applicable vehicles with tires where a tire rotation is possible or recommended. Refer to Corporate Bulletin Number 05-03-10-015B for information on tire rotation for vehicles with different front/rear tire/wheel sizes. SOME TIRE FEATHERING IS A NORMAL PART OF TIRE WEAR AND THROUGH PROPER TIRE ROTATION AND INFLATION, THIS TIRE WEAR CAN BE MINIMIZED AND TIRE LIFE MAXIMIZED. If the customer has not rotated the tires within the last 8,000 to 13,000 km (5,000 to 8,000 mi), a tire rotation in the modified X-pattern is necessary to clean-up the feathering, rather than placing the vehicle on the alignment machine. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 00-00-90-002J > Jan > 09 > Tires - Correct Inflation Pressure Information Tires: All Technical Service Bulletins Tires - Correct Inflation Pressure Information INFORMATION Bulletin No.: 00-00-90-002J Date: January 28, 2009 Subject: Information on Proper Tire Pressure Models: 2010 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2009 and Prior HUMMER H2, H3, H3T 2005-2009 Saab 9-7X Supercede: This bulletin is being revised to add model years and clarify additional information. Please discard Corporate Bulletin Number 00-00-90-002I (Section 00 - General Information). Important: ^ Adjustment of tire pressure for a customer with a Low Tire Pressure Monitor (TPM) light on and no codes in the TPM system is NOT a warrantable repair. Claims to simply adjust the tire pressure will be rejected. ^ ALL tires (including the spare tire) MUST be set to the recommended inflation pressure stated on the vehicle's tire placard (on driver's door) during the PRE-DELIVERY INSPECTION (PDI). Recommended inflation pressure is not the pressure printed on tire sidewall. ^ Tires may be over-inflated from the assembly plant due to the mounting process. ^ Generally a 5.6°C (10°F) temperature change will result in (is equivalent to) a 6.9 kPa (1 psi) tire pressure change. ^ 2008-2009 HUMMER H2 Only - The H2 comes standard with Light Truck "D" Load Range tires with a recommended cold inflation pressure of 289 kPa (42 psi). These tires will alert the driver to a low pressure situation at roughly 262 kPa (38 psi) due to a requirement in FMVSS 138 which specifies a Minimum Activation Pressure for each tire type. This creates a relatively narrow window of "usable" pressure values and the warning will be more sensitive to outside temperature changes during the colder months. As with other cold temperature/tire pressure issues, there is nothing wrong with the system itself. If a vehicle is brought in with this concern, check for tire damage and set all tires to the Recommended Cold Inflation Pressure shown on the vehicle placard. Accurate tire pressures ensure the safe handling and appropriate ride characteristics of GM cars and trucks. It is critical that the tire pressure be adjusted to the specifications on the vehicle¡C■s tire placard during PDI. Ride, handling and road noise concerns may be caused by improperly adjusted tire pressure. The first step in the diagnosis of these concerns is to verify that the tires are inflated to the correct pressures. The recommended tire inflation pressure is listed on the vehicle¡C■s tire placard. The tire placard is located on the driver¡C■s side front or rear door edge, center pillar, or the rear compartment lid. Tip ^ Generally a 5.6°C (10°F) temperature increase will result in (is equivalent to) a 6.9 kPa (1 psi) tire pressure increase. ^ The definition of a "cold" tire is one that has been sitting for at least 3 hours, or driven no more than 1.6 km (1 mi). ^ On extremely cold days, if the vehicle has been indoors, it may be necessary to compensate for the low external temperature by adding additional air to the tire during PDI. ^ During cold weather, the Tire Pressure Monitor (TPM) indicator light (a yellow horseshoe with an exclamation point) may illuminate. If this indicator turns off after the tires warm up (reach operating temperature), the tire pressure should be reset to placard pressure at the cold temperature. ^ The TPM system will work correctly with nitrogen in tires. ^ The TPM system is compatible with the GM Vehicle Care Tire Sealant but may not be with other commercially available sealants. Important: ^ Do not use the tire pressure indicated on the tire itself as a guide. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > 00-00-90-002J > Jan > 09 > Tires - Correct Inflation Pressure Information > Page 3619 ^ Always inspect and adjust the pressure when the tires are cold. ^ Vehicles that have different pressures for the front and the rear need to be adjusted after tire rotation. Improper tire inflation may result in any or all of the following conditions: ^ Premature tire wear ^ Harsh ride ^ Excessive road noise ^ Poor handling ^ Reduced fuel economy ^ Low Tire Pressure Monitor (TPM) Light ON ^ Low Tire Pressure Message on the Drivers Information Center (DIC) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > NHTSA05V552000 > Dec > 05 > Recall 05V552000: Tire Label Non-Compliance Tires: All Technical Service Bulletins Recall 05V552000: Tire Label Non-Compliance MAKE/MODELS: MODEL/BUILD YEARS: Buick/Rainier 2006 Buick/Terraza 2006 Cadillac/Escalade 2006 Cadillac/Escalade ESV 2006 Cadillac/Escalade EXT 2006 Chevrolet/Avalanche 2006 Chevrolet/Colorado 2006 Chevrolet/Express 2006 Chevrolet/Silverado 2006 Chevrolet/SSR 2006 Chevrolet/Suburban 2006 Chevrolet/Tahoe 2006 Chevrolet/Trailblazer 2006 Chevrolet/Trailblazer EXT 2006 Chevrolet/Uplander 2006 GMC/Canyon 2006 GMC/Envoy 2006 GMC/Savana 2006 GMC/Sierra 2006 GMC/Yukon 2006 GMC/Yukon XL 2006 Hummer/H2 2006 Hummer/H3 2006 Isuzu/Ascender 2006 Pontiac/Montana SV6 2006 Saturn/Relay 2006 MANUFACTURER: General Motors Corp. NHTSA CAMPAIGN ID NUMBER: 05V552000 MFG'S REPORT DATE: December 05, 2005 COMPONENT: Equipment: Other: Labels POTENTIAL NUMBER OF UNITS AFFECTED: 32068 SUMMARY: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Tires: > NHTSA05V552000 > Dec > 05 > Recall 05V552000: Tire Label Non-Compliance > Page 3624 Certain trucks and sport utility vehicles fail to conform to the requirements of Federal Motor Vehicle Safety Standard No. 110, "TIRE SELECTION AND RIMS." These vehicles were shipped with tire and loading information labels listing an inacccurate vehicle capacity weight. CONSEQUENCE: A misprinted label could lead to improper vehicle loading specifications or tire inflation which could result in a tire failure, increasing the risk of a crash. REMEDY: Owners will be provided with corrected labels and installation instructions. At the customer's option, a dealer can install the label for them. The manufacturer has not yet provided an owner notification schedule. Owners should contact Buick at 1-866-608-8080, Cadillac at 1-866-982-2339, Chevrolet at 1-800-630-2438, GMC at 1-866-996-9463, Hummer at 1-800-732-5493, Pontiac at 1-800-620-7668, Saturn at 1-800-972-8876, or Isuzu at 1-800-255-6727. NOTES: GM recall No. 05109. Customers can also contact The National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to http://www.safercar.gov. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 10-03-16-001 > Jul > 10 > TPMS System - Service And Re-Learning Sensor IDs Tires: All Technical Service Bulletins TPMS System - Service And Re-Learning Sensor IDs INFORMATION Bulletin No.: 10-03-16-001 Date: July 19, 2010 Subject: TPMS System Service and Re-Learning Sensor IDs Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2 2009 and Prior HUMMER H3 2010 and Prior Saturn Models 2009 and Prior Saab 9-7X with Wheel-Mounted Tire Pressure Sensors In the event that the spare tire, which is normally not equipped with a tire pressure monitor (TPM) sensor, is installed in place of one of the road tires and the vehicle is driven above 40 km/h (25 mph) for 20 minutes or more, the TPM indicator icon on the instrument panel cluster (IPC) will flash for approximately one minute and then remain on steady each time the ignition is turned ON, indicating a diagnostic trouble code (DTC) has been set. The driver information center (DIC), if equipped, will also display a SERVICE TIRE MONITOR type message. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is cleared. To ensure that the TPM indicator and the DIC message are cleared after service, it is necessary to clear any TPM DTCs using a scan tool. If a scan tool is unavailable, performing the TPM relearn procedure using a TPM diagnostic tool will provide the same results. It is advised to perform the relearn procedure away from other vehicles to prevent picking up a stray sensor signal. If one or more of the TPM sensors are missing or damaged and have been replaced, then the relearn procedure must be performed. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures Tires: All Technical Service Bulletins Tires/Wheels - Tire Puncture Repair Procedures INFORMATION Bulletin No.: 04-03-10-001F Date: April 27, 2010 Subject: Tire Puncture Repair Procedures For All Cars and Light Duty Trucks Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 04-03-10-001E (Section 03 - Suspension). This bulletin covers puncture repair procedures for passenger car and light duty truck radial tires in the tread area only. The tire manufacturer must be contacted for its individual repair policy and whether or not the speed rating is retained after repair. Caution - Tire changing can be dangerous and should be done by trained professionals using proper tools and procedures. Always read and understand any manufacturer's warnings contained in their customers literature or molded into the tire sidewall. - Serious eye and ear injury may result from not wearing adequate eye and ear protection while repairing tires. - NEVER inflate beyond 275 kPa (40 pounds) pressure to seat beads. Some run flat tires, such as the Goodyear Extended Mobility Tire (EMT) used on the Corvette, may require more than 275 kPa (40 psi) to seat the bead. In such a case, a tire safety cage must be used. Consult the tire manufacturer for its individual repair policy. - NEVER stand, lean or reach over the assembly during inflation. Repairable area on a radial tire. Important - NEVER repair tires worn to the tread indicators 1.59 mm (2/32") remaining depth). - NEVER repair tires with a tread puncture larger than 6.35 mm (1/4"). - NEVER substitute an inner tube for a permissible or non-permissible repair. - NEVER perform an outside-in tire repair (plug only, on the wheel). - Every tire must be removed from the wheel for proper inspection and repair. - Regardless of the type of repair used, the repair must seal the inner liner and fill the injury. - Consult with repair material supplier/manufacturer for repair unit application procedures and repair tools/repair material recommendations. Three basic steps for tire puncture repair: 1. Remove the tire from the wheel for inspection and repair. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3634 2. Fill the injury (puncture) to keep moisture out. 3. Seal the inner liner with a repair unit to prevent air loss. External Inspection 1. Prior to demounting, inspect the tire surface, the valve and the wheel for the source of the leak by using a water and soap solution. Mark the injured area and totally deflate the tire by removing the valve core. 2. Demount the tire from the wheel and place the tire on a well-lighted spreader. Internal Inspection 1. Spread the beads and mark the puncture with a tire crayon. 2. Inspect the inner tire for any signs of internal damage. 3. Remove the puncturing object, noting the direction of the penetration. 4. Probe the injury with a blunt awl in order to determine the extent and direction of the injury. 5. Remove any loose foreign material from the injury. 6. Punctures exceeding 6.35 mm (1/4") should not be repaired. Cleaning 1. Clean the area around the puncture thoroughly with a proper liner cleaner, clean cloth and a scraper. This step serves to remove dirt and mold lubricants to insure proper adhesion and non-contamination of the buffing tool. 2. Refer to information on the product or manufacturer's Material Safety Data Sheet and follow guidelines for handling and disposal. Clean the Injury Channel Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3635 1. Use a proper hand reamer, carbide cutter or drill bit to ream the puncture channel from the inside of the tire in order to clean the injury. 2. Remove steel wires protruding above the liner surface to prevent damage to the repair unit. 3. Consult your repair material supplier for recommended reaming tool(s). Fill the Injury 1. It is necessary to fill the injury channel to provide back up for the repair unit and to prevent moisture from entering the tire fabric and steel wires. 2. (For combination repair/plug units skip this step.) Cement the injured channel and fill the injury from the inside of the tire with the repair plug per repair material manufacturer's recommendations. Without stretching the plug, cut the plug off just above the inside tire surface. 3. Consult your repair material supplier for proper repair material selection. Repair Unit Selection Important Do not install the repair unit in this step. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3636 1. Center the repair unit over the injury as a reference and outline an area larger than the unit so that buffing will not remove the crayon marks. 2. Remove the repair unit. 3. DO NOT overlap previous or multiple repair units. 4. Consult your repair material supplier for proper repair unit selection. Buffing 1. To prevent contamination and preserve the outline, buff within the marked area thoroughly and evenly with a low speed buffing tool using a fine wire brush or gritted rasp. 2. Buff to a smooth velvet surface (RMA #1 or #2 buffed texture). 3. Use caution not to gouge the inner liner or expose casing fabric. 4. Remove any buffing dust with a vacuum cleaner. 5. Consult your repair material supplier for a proper buffing tool. Cementing Apply chemical cement according to the repair material manufacturer's procedures. Repair Unit Application Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3637 1. The tire must be in the relaxed position when the repair unit is installed (Do not spread the beads excessively). Two-Piece Plug and Repair Units 1. If applicable, install the repair unit so that the alignment is correct. 2. Center the repair unit over the injury and stitch down thoroughly with the stitching tool, working from the center out. 3. Being careful not to stretch the plug material, cut the plug flush with the outer tread. Combination Repair/Plug Units 1. Pull the plug through the injury until the repair just reaches the liner. Stitch down thoroughly. 2. Follow the repair material manufacturer's recommendations for further installation instructions. 2. Consult your repair material supplier for the proper stitching tool. Safety Cage Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 04-03-10-001F > Apr > 10 > Tires/Wheels - Tire Puncture Repair Procedures > Page 3638 Some run flat tires, such as the Goodyear Extended Mobility Tire (EMT) used on the Corvette, may require more than 275 kPa (40 psi) to seat the bead. In such a case, a tire safety cage must be used. Consult the tire manufacturer for its individual repair policy. Final Inspection 1. After remounting and inflating the tire, check both beads, the repair and the valve with a water and soap solution in order to detect leaks. 2. If the tire continues to lose air, the tire must be demounted and reinspected. 3. Balance the tire and wheel assembly. Refer to Tire and Wheel Assembly Balancing - OFF Vehicle. For additional tire puncture repair information, contact: Rubber Manufacturers Association (RMA) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 05-03-10-020C > Apr > 10 > Wheels/Tires - Use of Nitrogen Gas in Tires Tires: All Technical Service Bulletins Wheels/Tires - Use of Nitrogen Gas in Tires INFORMATION Bulletin No.: 05-03-10-020C Date: April 27, 2010 Subject: Use of Nitrogen Gas in Tires Models: 2011 and Prior GM Passenger Cars and Trucks (including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 05-03-10-020B (Section 03 - Suspension). GM's Position on the Use of Nitrogen Gas in Tires General Motors does not oppose the use of purified nitrogen as an inflation gas for tires. We expect the theoretical benefits to be reduced in practical use due to the lack of an existing infrastructure to continuously facilitate inflating tires with nearly pure nitrogen. Even occasional inflation with compressed atmospheric air will negate many of the theoretical benefits. Given those theoretical benefits, practical limitations, and the robust design of GM original equipment TPC tires, the realized benefits to our customer of inflating their tires with purified nitrogen are expected to be minimal. The Promise of Nitrogen: Under Controlled Conditions Recently, nitrogen gas (for use in inflating tires) has become available to the general consumer through some retailers. The use of nitrogen gas to inflate tires is a technology used in automobile racing. The following benefits under controlled conditions are attributed to nitrogen gas and its unique properties: - A reduction in the expected loss of Tire Pressure over time. - A reduction in the variance of Tire Pressures with temperature changes due to reduction of water vapor concentration. - A reduction of long term rubber degradation due to a decrease in oxygen concentrations. Important These are obtainable performance improvements when relatively pure nitrogen gas is used to inflate tires under controlled conditions. The Promise of Nitrogen: Real World Use Nitrogen inflation can provide some benefit by reducing gas migration (pressure loss) at the molecular level through the tire structure. NHTSA (National Highway Traffic Safety Administration) has stated that the inflation pressure loss of tires can be up to 5% a month. Nitrogen molecules are larger than oxygen molecules and, therefore, are less prone to "seeping" through the tire casing. The actual obtainable benefits of nitrogen vary, based on the physical construction and the materials used in the manufacturing of the tire being inflated. Another potential benefit of nitrogen is the reduced oxidation of tire components. Research has demonstrated that oxygen consumed in the oxidation process of the tire primarily comes from the inflation media. Therefore, it is reasonable to assume that oxidation of tire components can be reduced if the tire is inflated with pure nitrogen. However, only very small amounts of oxygen are required to begin the normal oxidation process. Even slight contamination of the tire inflation gas with compressed atmospheric air during normal inflation pressure maintenance, may negate the benefits of using nitrogen. GM Tire Quality, Technology and Focus of Importance Since 1972, General Motors has designed tires under the TPC (Tire Performance Criteria) specification system, which includes specific requirements that ensure robust tire performance under normal usage. General Motors works with tire suppliers to design and manufacture original equipment tires for GM vehicles. The GM TPC addresses required performance with respect to both inflation pressure retention, and endurance properties for original equipment tires. The inflation pressure retention requirements address availability of oxygen and oxidation concerns, while endurance requirements ensure the mechanical structure of the tire has sufficient strength. This combination has provided our customers with tires that maintain their structural integrity throughout their useful treadlife under normal operating conditions. Regardless of the inflation media for tires (atmospheric air or nitrogen), inflation pressure maintenance of tires is critical for overall tire, and ultimately, vehicle performance. Maintaining the correct inflation pressure allows the tire to perform as intended by the vehicle manufacturer in many areas, including comfort, fuel economy, stopping distance, cornering, traction, treadwear, and noise. Since the load carrying capability of a tire is related to inflation pressure, proper inflation pressure maintenance is necessary for the tire to support the load imposed by the vehicle without excessive structural Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 05-03-10-020C > Apr > 10 > Wheels/Tires - Use of Nitrogen Gas in Tires > Page 3643 degradation. Important Regardless of the inflation media for tires (atmospheric air or nitrogen), inflation pressure maintenance of tires is critical for overall tire, and ultimately, vehicle performance. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips Tires: All Technical Service Bulletins Tire Pressure Monitor - TPM System Message/Service Tips # 09-03-16-002A: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information - (Apr 27, 2010) Subject: Dealership Service Consultant Procedure as Vehicle Comes into Service Drive for Tire Pressure Monitor (TPM) System Message, Light and Customer Information Models: 2006-2011 Cars and Light Duty Trucks (Including Saturn and Saab) 2006-2010 HUMMER H2, H3 ATTENTION The information found in this bulletin is to be used as a dealership service consultant procedures for customers coming into the service lane with an illuminated "low tire light" or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. Maintaining proper tire pressures is an Owner's Maintenance item and is not covered under warranty. This bulletin is being revised to add model years and update additional bulletin reference information. Please discard Corporate Bulletin Number 09-03-16-002 (Section 03 -- Suspension). Customer Concerns and Confusion with the Tire Pressure Monitoring (TPM) System The following procedure should be used by dealership service consultants when a customer comes into the service drive with a "low tire light" on or comments on a check tire pressure/low tire pressure/add air to tire or service tire monitor system message. The service consultant should perform the following steps: Procedure Turn the key to ON, without starting the engine. ^ If the low tire light comes on and stays on solid with a check tire pressure/low tire pressure/add air to tire message (on vehicles equipped with DIC), advise the customer: - The system is working properly. - Properly adjusting all tire air pressures to the recommended levels and driving the vehicle will turn the light off (refer to the Tire and Loading Information label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". ^ If the Tire Pressure Monitor (TPM) light blinks for one minute then stays on solid with a service tire monitor system message (on vehicles equipped with DIC): - A TPM system problem exists. The vehicle should be written up accordingly and sent to your service department for further DTC diagnosis and service. - If dashes (--) are displayed in only one or two of the tire pressure readouts, it is likely caused by a previous TPM system relearn that was performed incorrectly due to interference from another vehicle's TPM system during the relearn process (refer to the Important statement later in this bulletin regarding TPM relearn with a Tech 2(R)). - If dashes (--) are displayed in all four of the tire pressure readouts, there is a system problem. Follow the appropriate SI service procedures. ^ If a customer indicates the low tire light comes on for a few minutes when the vehicle is started, then goes off after driving a while, advise the customer: - The system is working properly. - Most likely, air pressure in one or more of the tires is low enough to turn the light on when tires are cold. After driving for a while, tires will heat Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3648 up, allowing tire air pressure to increase above the threshold causing the light to go off. Properly adjusting all tire air pressures to the recommended levels will correct this (Refer to the Tire and Loading Information Label on the driver side door). - More detailed information can be found in the Owner Manual. - Service is not covered under warranty - this maintenance is the responsibility of the owner. - Give the customer a copy of the "GM Customer TPMS Information". For more detailed information, refer to Corporate Bulletin Number 07-03-16-004C and TPMS Training Course 13044.12T2. Tire Pressure Light At key on, without starting the vehicle: Steady Solid Glowing TPM Indicator If the TPM indicator appears as a steady glowing yellow lamp (as above), the system is functioning properly and you should add air to the tires to correct this condition. Blinking TPM Indicator If the TPM indicator appears as a BLINKING yellow lamp for one minute and then stays on solid, diagnostic service is needed. The Effect of Outside Temperature on Tire Pressures Important: As a rule of thumb, tire pressure will change about 7kPa (1 psi) for every 6°C (10°F) decrease in temperature - Tire pressure will drop when it gets colder outside, and rise when it gets warmer. Under certain situations such as extreme outside temperature changes, the system may bring on a solid light with a check tire pressure message. This should be considered normal and the system is working properly. The light will turn off upon adding the proper amount of air to the tires (refer to the Tire & Loading Information label in the driver's door opening). When properly adjusting tire air pressure, the following steps are important to help optimize the system and prolong bringing a tire pressure light on: ^ Use an accurate, high quality tire pressure gauge. ^ Never set the tire pressure below the specified placard value regardless of tire temperature or ambient temperature. ^ Tire pressure should be set to the specified placard pressure at the lowest seasonal temperature the vehicle will encounter during operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3649 ^ When adding proper tire air pressure, it is important to remember fluctuations in outside air temperatures and tire temperatures effect tire air pressures. ^ After you have added the proper tire pressure, if the vehicle has a DIC (after the system has updated), check to see if DIC displays are the same readings as the tire pressure gauge used (adjust as necessary). ^ Only perform a TPM sensor re-learn after a tire rotation or system part replacements and use the Tech 2(R) to initiate the relearn whenever possible to avoid invalid sensor I.D. learns. Important: Always take outside temperature and tire temperature into consideration to properly set tire pressures. Foe example, on colder days (20°F/-7°C), if setting tire pressure when the vehicle has been indoors (60°F/16°C) or the tires are warm from being driven, it will be necessary to compensate for the low outside temperature by adding 21-27 kPa (3-4 psi) more then the placecard pressure. At some later time, when the vehicle has been parked outside for a while, the tires will cool off and the pressures will drop back into the placecard range. Important: Recently, nitrogen gas (for use in inflating tires) has become available to the general customer through some retailers. The use of nitrogen gas to inflate tires is a technology used in automobile racing. Tires inflated with nitrogen gas may exhibit less of a pressure change in response to outside temperature changes. Nitrogen gas inflation is compatible with GM TPM sensors. For additional information, refer to Corporate Service Bulletin 05-03-10-020C. Important: All Models (Except the Pontiac Vibe): Do not perform a TPM relearn at PDI, the system has already been set at the Assembly Plant. Do not perform a TPM relearn after adding air to the tires. The low tire light is similar to the low fuel indicator and adding something (fuel, air) to the vehicle makes that light turn back off again. Note that because of system behavior, some vehicles must be driven a short distance before the sensors recognize the increase in pressure and turns the light off again. Pontiac Vibe Only: Do not use the TPMS reset button to turn off the light. The system will update and light will turn off when all tire pressures have been adjusted followed by short distance drive. Important: All models (except the Pontiac Vibe): Each tire monitor sensor is learned to a specific vehicle corner. When performing a TPM relearn (only after a tire rotation or replacement of a TPM sensor or Module), always use the Tech2(R) to initiate the J 46079 relearned process. Tech 2(R) - initiated relearns lock out other vehicle TPM signals that may be broadcasting in the area. Only signals initiated by the J 46079 tool will be accepted. This method avoids storing false TPM I.D.s and will prevent customers from returning with dashes (--) displayed in tire pressure readouts and/or a flashing tire pressure monitor (TPM) light. Checking the four TPM I.D.s with the Tech 2(R) prior to and following relearn to verify they are the same can prevent invalid I.D. learns. Pontiac Vibe Only: Tire Monitor Sensors are not learned to a specific vehicle corner. Do not perform a TPM Reset after tire rotation. The TPMS Reset button must only be used during pre-delivery inspection by the dealer to initialize the system (after all tire pressures have been adjusted properly) or when a Tire Pressure Monitor System component is replaced. The J 46079 tool does not work on Vibe TPM sensors. A TPMS relearn on Vibe must be preformed with a Tech 2(R) to set the TPMS Module in learn mode. The TPMS sensor IDs are entered through the Tech 2(R). Refer to SI for further Vibe TPMS information. Labor Operation and Repair Order/Warranty System Claim Required Documentation Important: The ONLY time labor operation E0726 or E0722 should be used is to diagnose for a system issue. That should ONLY occur if, at key ON, without starting the engine, the Tire Pressure Monitor (TPM) blinks for one minute and then stays on solid with a Service Tire Monitor System message (on vehicles equipped with a DIC) If that occurs, a TPM system problem exists and the system will have set a DTC. If one of these operastions is used, the following Repair Order and Warranty System documentation are required: ^ Document the customer complaint on the Repair Order. ^ Document the TPMS DTC that has set on the Repair Order. ^ Enter the TPMS DTC in the Warranty System (WINS) in the Failure Code/DTC field on the claim submission (refer to the Claims Processing Manual, Section IV, Warranty claim Data, Page 6, Item G). If the above information is not documented on the Repair Order and Warranty System, the claim may be rejected. If the Warranty Parts Center (WPC) generates a request, this repair order documentation must be sent back. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3650 Customer TPMS Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3651 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 09-03-16-002A > Apr > 10 > Tire Pressure Monitor - TPM System Message/Service Tips > Page 3652 Frequently Asked Questions Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 07-03-10-008B > Aug > 09 > Tires - Slight/Mild Edge Feathering Information Tires: All Technical Service Bulletins Tires - Slight/Mild Edge Feathering Information INFORMATION Bulletin No.: 07-03-10-008B Date: August 13, 2009 Subject: Information on Slight or Mild Tire Feathering and Recommended Practices (Normal Tire Wear Condition) Models: 2006-2010 GM Passenger Cars and Light Duty Trucks (including Saturn) 2006-2010 HUMMER H2, H3 2006-2009 Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 07-03-10-008A (Section 03 - Suspension). This bulletin provides information regarding the normal tire wear condition of slight or mild tire feathering and recommended practices. If a vehicle comes into a dealership with a concern of slight or mild feathering-type wear on the tires, review with the customer their past tire rotation history. Tires should be rotated every 8,000 to 13,000 km (5,000 to 8,000 mi) for applicable vehicles with tires where a tire rotation is possible or recommended. Refer to Corporate Bulletin Number 05-03-10-015B for information on tire rotation for vehicles with different front/rear tire/wheel sizes. SOME TIRE FEATHERING IS A NORMAL PART OF TIRE WEAR AND THROUGH PROPER TIRE ROTATION AND INFLATION, THIS TIRE WEAR CAN BE MINIMIZED AND TIRE LIFE MAXIMIZED. If the customer has not rotated the tires within the last 8,000 to 13,000 km (5,000 to 8,000 mi), a tire rotation in the modified X-pattern is necessary to clean-up the feathering, rather than placing the vehicle on the alignment machine. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 00-00-90-002J > Jan > 09 > Tires - Correct Inflation Pressure Information Tires: All Technical Service Bulletins Tires - Correct Inflation Pressure Information INFORMATION Bulletin No.: 00-00-90-002J Date: January 28, 2009 Subject: Information on Proper Tire Pressure Models: 2010 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2009 and Prior HUMMER H2, H3, H3T 2005-2009 Saab 9-7X Supercede: This bulletin is being revised to add model years and clarify additional information. Please discard Corporate Bulletin Number 00-00-90-002I (Section 00 - General Information). Important: ^ Adjustment of tire pressure for a customer with a Low Tire Pressure Monitor (TPM) light on and no codes in the TPM system is NOT a warrantable repair. Claims to simply adjust the tire pressure will be rejected. ^ ALL tires (including the spare tire) MUST be set to the recommended inflation pressure stated on the vehicle's tire placard (on driver's door) during the PRE-DELIVERY INSPECTION (PDI). Recommended inflation pressure is not the pressure printed on tire sidewall. ^ Tires may be over-inflated from the assembly plant due to the mounting process. ^ Generally a 5.6°C (10°F) temperature change will result in (is equivalent to) a 6.9 kPa (1 psi) tire pressure change. ^ 2008-2009 HUMMER H2 Only - The H2 comes standard with Light Truck "D" Load Range tires with a recommended cold inflation pressure of 289 kPa (42 psi). These tires will alert the driver to a low pressure situation at roughly 262 kPa (38 psi) due to a requirement in FMVSS 138 which specifies a Minimum Activation Pressure for each tire type. This creates a relatively narrow window of "usable" pressure values and the warning will be more sensitive to outside temperature changes during the colder months. As with other cold temperature/tire pressure issues, there is nothing wrong with the system itself. If a vehicle is brought in with this concern, check for tire damage and set all tires to the Recommended Cold Inflation Pressure shown on the vehicle placard. Accurate tire pressures ensure the safe handling and appropriate ride characteristics of GM cars and trucks. It is critical that the tire pressure be adjusted to the specifications on the vehicle¡C■s tire placard during PDI. Ride, handling and road noise concerns may be caused by improperly adjusted tire pressure. The first step in the diagnosis of these concerns is to verify that the tires are inflated to the correct pressures. The recommended tire inflation pressure is listed on the vehicle¡C■s tire placard. The tire placard is located on the driver¡C■s side front or rear door edge, center pillar, or the rear compartment lid. Tip ^ Generally a 5.6°C (10°F) temperature increase will result in (is equivalent to) a 6.9 kPa (1 psi) tire pressure increase. ^ The definition of a "cold" tire is one that has been sitting for at least 3 hours, or driven no more than 1.6 km (1 mi). ^ On extremely cold days, if the vehicle has been indoors, it may be necessary to compensate for the low external temperature by adding additional air to the tire during PDI. ^ During cold weather, the Tire Pressure Monitor (TPM) indicator light (a yellow horseshoe with an exclamation point) may illuminate. If this indicator turns off after the tires warm up (reach operating temperature), the tire pressure should be reset to placard pressure at the cold temperature. ^ The TPM system will work correctly with nitrogen in tires. ^ The TPM system is compatible with the GM Vehicle Care Tire Sealant but may not be with other commercially available sealants. Important: ^ Do not use the tire pressure indicated on the tire itself as a guide. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > All Other Service Bulletins for Tires: > 00-00-90-002J > Jan > 09 > Tires - Correct Inflation Pressure Information > Page 3661 ^ Always inspect and adjust the pressure when the tires are cold. ^ Vehicles that have different pressures for the front and the rear need to be adjusted after tire rotation. Improper tire inflation may result in any or all of the following conditions: ^ Premature tire wear ^ Harsh ride ^ Excessive road noise ^ Poor handling ^ Reduced fuel economy ^ Low Tire Pressure Monitor (TPM) Light ON ^ Low Tire Pressure Message on the Drivers Information Center (DIC) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > Page 3662 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > Page 3663 Tires: Description and Operation Tread Wear Indicators Description Tread Wear Indicators Description The original equipment tires have tread wear indicators that show when you should replace the tires. The location of these indicators are at 72 degree intervals around the outer diameter of the tire. The indicators appear as a 6 mm (0.25 inch) wide band when the tire tread depth becomes 1.6 mm (2/32 inch). Tire Inflation Description When you inflate the tires to the recommended inflation pressures, the factory-installed wheels and tires are designed in order to handle loads to the tire's rated load capacity. Incorrect tire pressures, or under-inflated tires, can cause the following conditions: ^ Vehicle handling concerns ^ Poor fuel economy ^ Shortened tire life ^ Tire overloading Inspect the tire pressure when the following conditions apply: ^ The vehicle has been sitting at least 3 hours. ^ The vehicle has not been driven for more than 1.6 km (1 mile). ^ The tires are cool. Inspect the tires monthly or before any extended trip. Adjust the tire pressure to the specifications on the tire label. Install the valve caps or the extensions on the valves. The caps or the extensions keep out dust and water. The kilopascal (kPa) is the metric term for pressure. The tire pressure may be printed in both kilopascal (kPa) and psi. One psi equals 6.9 kPa. Inflation Pressure Conversion (Kilopascals to PSI) Tires with a higher than recommended pressure can cause the following conditions: ^ A hard ride ^ Tire bruising Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > Page 3664 ^ Rapid tread wear at the center of the tire Tires with a lower than recommended pressure can cause the following conditions: ^ A tire squeal on turns ^ Hard steering ^ Rapid wear and uneven wear on the edge of the tread ^ Tire rim bruises and tire rim rupture ^ Tire cord breakage ^ High tire temperatures ^ Reduced vehicle handling ^ High fuel consumption ^ Soft riding Unequal pressure on the same axle can cause the following conditions: ^ Uneven braking ^ Steering lead ^ Reduced vehicle handling Refer to the Tire Placard for specific tire and wheel applications and tire pressures. Tire Chain Usage Description Tire Chain Usage Description When you use tire chains, most current vehicles require the following chain types: ^ SAE Class S or 1100 Series, Type PL tire chains (1) ^ SAE Class U or 1200 Series, Type P tire chains (2) ^ 1800 Series Lug Reinforced tire chains (3) These chains are specially designed in order to limit the fly-off effect that occurs when the wheel rotates. Manufacturers of tire chains have a specific chain size for each tire size. These ensure a proper fit when the chains are installed. Purchase the correct chains for the tires on which the chains will be used. Do not use rubber adjusters to take up slack in chains that are loose due to incorrect size. Always follow the chain manufacturer's installation instructions. The use of chains may adversely affect handling. When using chains, remember the following information: ^ Ensure that the vehicle is designed for chain clearance. ^ Adjust the speed to road conditions. ^ Avoid sharp turns. ^ Avoid locked-wheel braking in order to prevent chain damage to the vehicle. ^ Install the chains as tightly as possible on the drive tires. Tighten the chains again after driving 0.4 - 0.8 km (0.25 - 0.5 mile). Do not use chains on the non-drive tires. These chains may contact and damage the vehicle. If you use chains on the non-drive tires, ensure that there is enough clearance. ^ Do not exceed 70 km/h (45 mph). Do not exceed the chain manufacturer's speed limit, if lower. ^ Drive in a restrained manner. Avoid large bumps, potholes, severe turns, and other maneuvers that cause the tires to bounce up and down. ^ Follow any other instructions from the chain manufacturer that do not disagree with the above. All Seasons Tires Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Technical Service Bulletins > Page 3665 Most GM vehicles are equipped with steel belted all-season radial tires as standard equipment. These tires qualify as snow tires, with a higher than average rating for snow traction than the non-all season radial tires previously used. Other performance areas, such as wet traction, rolling resistance, tread life, and air retention, are also improved. This is done by improvements in both tread design and tread compounds. These tires are identified by an M + S molded in the tire side wall after the tire size. The suffix MS is also molded in the tire side wall after the TPC specification number. The optional handling tires used on some vehicles now also have the MS marking after the tire size and the TPC specification number. P-Metric Sized Tires Description P-Metric Sized Tires Description Most P-metric tire sizes do not have exact corresponding alphanumeric tire sizes. Replacement tires should be of the same tire performance criteria (TPC) specification number including the same size, the same load range, and the same construction as those originally installed on the vehicle. Consult a tire dealer if you must replace the P-metric tire with other sizes. Tire companies can best recommend the closest match of alphanumeric to P-metric sizes within their own tire lines. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Service and Repair > Tire Mounting and Dismounting Tires: Service and Repair Tire Mounting and Dismounting Tire Mounting and Dismounting Notice: Use a tire changing machine in order to dismount tires. Do not use hand tools or tire irons alone in order to remove the tire from the wheel. Damage to the tire beads or the wheel rim could result. Notice: Do not scratch or damage the clear coating on aluminum wheels with the tire changing equipment. Scratching the clear coating could cause the aluminum wheel to corrode and the clear coating to peel from the wheel. 1. Deflate the tire completely. Notice: Damage to either the tire bead or the wheel mounting holes can result from the use of improper wheel attachment or tire mounting procedures. It takes up to 70 seconds for all of the air to completely exhaust from a large tire. Failure to follow the proper procedures could cause the tire changer to put enough force on the tire to bend the wheel at the mounting surface. Such damage may result in vibration and/or shimmy, and under severe usage lead to wheel cracking. 2. Use the tire changer in order to remove the tire from the wheel. Important: Rim-clamp, sometimes called-European-type tire changers are recommended. 3. Use a wire brush or coarse steel wool in order to remove any rubber, light rust or corrosion from the wheel bead seats. 4. Apply GM P/N 12345884 (Canadian P/N 5728223) or equivalent to the tire bead and the wheel rim. Notice: When mounting the tires, use an approved tire mounting lubricant. DO NOT use silicon or corrosive base compounds to lubricate the tire bead and the wheel rim. A silicon base compound can cause the tire to slip on the rim. A corrosive type compound can cause tire or rim deterioration. 5. Use the tire changer in order to install the tire to the wheel. 6. Inflate the tire to the proper air pressure. Caution: To avoid serious personal injury, do not stand over tire when inflating. The bead may break when the bead snaps over the safety hump. Do not exceed 275 kPa (40 psi) pressure when inflating any tire if beads are not seated. If 275 kPa (40 psi) pressure will not seat the beads, deflate, relubricate the beads and reinflate. Overinflation may cause the bead to break and cause serious personal injury. 7. Ensure that the locating rings are visible on both sides of the tire in order to verify that the tire bead is fully seated on the wheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Service and Repair > Tire Mounting and Dismounting > Page 3668 Tires: Service and Repair Tire Repair Tire Repair Many different materials and techniques are available on the market in order to repair tires. Not all of the materials and techniques work on some types of tires. Tire manufacturers have published detailed instructions on how and when to repair tires. Obtain the instructions from the manufacturer. If the vehicle is equipped with a compact spare tire, do not repair the compact spare. Important: The latex-based GM Tire Sealant Solution contains ethylene glycol and should be disposed of properly. Certain GM vehicles are not equipped with a spare tire but utilize an inflator kit that uses a liquid sealant. Upon removing the tire from the wheel, if liquid solution is found, the liquid should be extracted from the tire. After removing the liquid, mark the damaged area and remove the puncturing object. Wipe the wheel and the inside of the tire with a shop towel to remove the remaining residue prior to tire repair. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Service and Repair > Tire Mounting and Dismounting > Page 3669 Tires: Service and Repair Tire Rotation Tire Rotation In order to equalize wear, rotate the tires at the specified intervals. Also, rotate the tire and wheel assembly whenever you notice uneven tire wear. Radial tires tend to wear faster in the shoulder area, particularly in front positions, due to design. Radial tires in non-drive locations may develop an irregular wear pattern that can generate tire noise. This especially makes regular tire rotation necessary. ^ For vehicles with single rear wheels (4 tires), rotate the tires as shown. ^ For vehicles with single rear wheels (5 tires), rotate the tires as shown. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Service and Repair > Tire Mounting and Dismounting > Page 3670 Tires: Service and Repair Tire and Wheel Rotation and Inspection TIRE AND WHEEL INSPECTION AND ROTATION Tires should be rotated every 8 000-13 000 km (5,000-8,000 mi). Any time you notice unusual wear, rotate the tires as soon as possible and test the wheel alignment. Also inspect for damaged tires or wheels. Make sure the spare tire is stored securely Push, pull, and then try to rotate or turn the tire, If it moves, use the folding wrench to tighten the cable. The purpose of regular rotation is to achieve more uniform wear for all tires on the vehicle. The first rotation is the most important. Refer to Scheduled Maintenance for scheduled rotation intervals. When rotating your tires, always use the correct rotation pattern shown here. ^ Do not include the compact spare tire in your tire rotation. ^ After the tires have been rotated, adjust the front and rear inflation pressures Refer to Tire Placard. ^ Ensure that all wheel nuts are properly tightened. CAUTION: Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after a time. The wheel could come off and cause an accident. When you change a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, you can use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if you need to, to get all the rust or dirt off. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Tires > Component Information > Service and Repair > Tire Mounting and Dismounting > Page 3671 Tires: Service and Repair Tire Hoist and Shaft Replacement Tire Hoist and Shaft Replacement Removal Procedure 1. Raise and support the vehicle. Refer to Vehicle Lifting. 2. Remove the spare tire from the spare tire carrier. 3. Remove spare wheel hoist assembly mounting bolts from the frame. 4. Remove the spare wheel hoist assembly from the vehicle. Installation Procedure 1. Install the spare wheel hoist assembly to the vehicle. 2. Install spare wheel hoist assembly mounting bolts to the frame Tighten the spare wheel hoist assembly mounting bolts to the frame to 50 Nm (37 inch lbs.). Notice: Refer to Fastener in Service Precautions. 3. Install the spare tire to the spare tire carrier. 4. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) Wheels: Customer Interest Wheels/Tires - Tire Radial Force Variation (RFV) INFORMATION Bulletin No.: 00-03-10-006F Date: May 04, 2010 Subject: Information on Tire Radial Force Variation (RFV) Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X 2000-2005 Saturn L Series 2003-2007 Saturn ION Supercede: This bulletin is being revised to considerably expand the available information on Radial Force Variation (RFV) and should be reviewed in whole. Please discard Corporate Bulletin Number 00-03-10-006E (Section 03 - Suspension). Important - Before measuring tires on equipment such as the Hunter GSP9700, the vehicle MUST be driven a minimum of 16 km (10 mi) to ensure removal of any flat-spotting. Refer to Corporate Bulletin Number 03-03-10-007E - Tire/Wheel Characteristics of GM Original Equipment Tires. - Equipment such as the Hunter GSP9700 MUST be calibrated prior to measuring tire/wheel assemblies for each vehicle. The purpose of this bulletin is to provide guidance to GM dealers when using tire force variation measurement equipment, such as the Hunter GSP9700. This type of equipment can be a valuable tool in diagnosing vehicle ride concerns. The most common ride concern involving tire radial force variation is highway speed shake on smooth roads. Tire related smooth road highway speed shake can be caused by three conditions: imbalance, out of round and tire force variation. These three conditions are not necessarily related. All three conditions must be addressed. Imbalance is normally addressed first, because it is the simpler of the three to correct. Off-vehicle, two plane dynamic wheel balancers are readily available and can accurately correct any imbalance. Balancer calibration and maintenance, proper attachment of the wheel to the balancer, and proper balance weights, are all factors required for a quality balance. However, a perfectly balanced tire/wheel assembly can still be "oval shaped" and cause a vibration. Before balancing, perform the following procedures. Tire and Wheel Diagnosis 1. Set the tire pressure to the placard values. 2. With the vehicle raised, ensure the wheels are centered on the hub by loosening all wheel nuts and hand-tightening all nuts first by hand while shaking the wheel, then torque to specifications using a torque wrench, NOT a torque stick. 3. Visually inspect the tires and the wheels. Inspect for evidence of the following conditions and correct as necessary: - Missing balance weights - Bent rim flange - Irregular tire wear - Incomplete bead seating - Tire irregularities (including pressure settings) - Mud/ice build-up in wheel - Stones in the tire tread - Remove any aftermarket wheels and/or tires and restore vehicle to original condition prior to diagnosing a smooth road shake condition. 4. Road test the vehicle using the Electronic Vibration Analyzer (EVA) essential tool. Drive for a sufficient distance on a known, smooth road surface to duplicate the condition. Determine if the vehicle is sensitive to brake apply. If the brakes are applied lightly and the pulsation felt in the steering wheel increases, refer to the Brakes section of the service manual that deals with brake-induced pulsation. If you can start to hear the vibration as a low boom noise (in addition to feeling it), but cannot see it, the vehicle likely has a first order (one pulse per propshaft revolution) driveline vibration. Driveline first order vibrations are high enough in frequency that most humans can start to hear them at highway speeds, but are too high to be able to be easily seen. These issues can be caused by driveline imbalance or misalignment. If the vehicle exhibits this low boom and the booming pulses in-and-out on a regular basis (like a throbbing), chances are good that the vehicle could have driveline vibration. This type Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3680 of vibration is normally felt more in the "seat of the pants" than the steering wheel. 5. Next, record the Hertz (Hz) reading as displayed by the EVA onto the tire data worksheet found at the end of this bulletin. This should be done after a tire break-in period of at least 16 km (10 mi) at 72 km/h (45 mph) or greater, in order to eliminate any possible tire flat-spotting. This reading confirms what the vehicle vibration frequency is prior to vehicle service and documents the amount of improvement occurring as the result of the various steps taken to repair. Completing the Steering Wheel Shake Worksheet below is required. A copy of the completed worksheet must be saved with the R.O. and a copy included with any parts returned to the Warranty Parts Center for analysis. A reading of 35 to 50 Hz typically indicates a first order propshaft vibration. If this is the situation, refer to Corporate Bulletin Number 08-07-30-044D. Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration and if this is the reading obtained, continue using this bulletin. If the tire 1st order vibration goes away and stays away during this evaluation, the cause is likely tire flat-spotting. Tire flat-spotting vibration may come and go at any speed over 72 km/h (45 mph) during the first 10 minutes of operation, if vibration continues after 10 minutes of driving at speeds greater than 72 km/h (45 mph), tire flat-spotting can be ruled out as the cause for vibration. 6. If flat-spotting is the cause, provide the explanation that this has occurred due to the vehicle being parked for long periods of time and that the nature of the tire is to take a set. Refer to Corporate Bulletin Number 03-03-10-007E: Information on Tire/Wheel Characteristics (Vibration, Balance, Shake, Flat Spotting) of GM Original Equipment Tires. 7. If the road test indicates a shake/vibration exists, check the imbalance of each tire/wheel assembly on a known, calibrated, off-car dynamic balancer.Make sure the mounting surface of the wheel and the surface of the balancer are absolutely clean and free of debris. Be sure to chose the proper cone/collet for the wheel, and always use the pilot bore for centering. Never center the wheel using the hub-cap bore since it is not a precision machined surface. If any assembly calls for more than 1/4 ounce on either rim flange, remove all balance weights and rebalance to as close to zero as possible. If you can see the vibration (along with feeling it) in the steering wheel (driving straight without your hands on the wheel), it is very likely to be a tire/wheel first order (one pulse per revolution) disturbance. First order disturbances can be caused by imbalance as well as non-uniformities in tires, wheels or hubs. This first order frequency is too low for a human to hear, but if the amplitude is high enough, it can be seen. If a vibration or shake still exists after balancing, any out of round conditions, of the wheel, and force variation conditions of the tire, must be addressed. Equipment such as the Hunter GSP9700 can address both (it is also a wheel balancer). Tire radial force vibration (RFV) can be defined as the amount of stiffness variation the tire will produce in one revolution under a constant load. Radial force variation is what the vehicle feels because the load (weight) of the vehicle is always on the tires. Although free runout of tires (not under load) is not always a good indicator of a smooth ride, it is critical that total tire/wheel assembly runout be within specification. Equipment such as the Hunter GSP9700 loads the tire, similar to on the vehicle, and measures radial force variation of the tire/wheel assembly. Note that the wheel is affecting the tire's RFV measurement at this point. To isolate the wheel, its runout must be measured. This can be easily done on the Hunter, without the need to set up dial indicators. If the wheel meets the runout specification, the tire's RFV can then be addressed. After measuring the tire/wheel assembly under load, and the wheel alone, the machine then calculates (predicts) the radial force variation of the tire. However, because this is a prediction that can include mounting inaccuracies, and the load wheel is much smaller in diameter than used in tire production, this type of service equipment should NOT be used to audit new tires. Rather, it should be used as a service diagnostic tool to minimize radial force variation of the tire/wheel assembly. Equipment such as the Hunter GSP9700 does an excellent job of measuring wheel runout, and of finding the low point of the wheel (for runout) and the high point of the tire (for radial force variation). This allows the tire to be matched mounted to the wheel for lowest tire/wheel assembly force variation. The machine will simplify this process into easy steps. The following assembly radial force variation numbers should be used as a guide: When measuring RFV and match mounting tires perform the following steps. Measuring Wheel Runout and Assembly Radial Force Variation Important The completed worksheet at the end of this bulletin must be attached to the hard copy of the repair order. - Measure radial force variation and radial runout. - If a road force/balancing machine is used, record the radial force variation (RFV) on the worksheet at the end of this bulletin. It may be of benefit to have the lowest RFV assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires onto the subject vehicle. - If a runout/balancing machine is used, record the radial runout of the tire/wheel assemblies on the worksheet at the end of this bulletin. If one or more of the tire/wheel assemblies are more than.040 in (1.02 mm), match mount the tire to the wheel to get below.040 in (1.02 mm). For sensitive customers, readings of 0.030 inch (0.76 mm) or less are preferable, it may also be of benefit to have the lowest runout assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3681 onto the subject vehicle. - After match mounting, the tire/wheel assembly must be rebalanced. If match mounting tires to in-spec wheels produces assembly values higher than these, tire replacement may be necessary. Replacing tires at lower values will probably mean good tires are being condemned. Because tires can sometimes become temporarily flat-spotted, which will affect force variation, it is important that the vehicle be driven at least 16 km (10 mi) prior to measuring. Tire pressure must also be adjusted to the usage pressure on the vehicle's tire placard prior to measuring. Most GM vehicles will tolerate radial force variation up to these levels. However, some vehicles are more sensitive, and may require lower levels. Also, there are other tire parameters that equipment such as the Hunter GSP9700 cannot measure that may be a factor. In such cases, TAC should be contacted for further instructions. Important - When mounting a GM wheel to a wheel balancer/force variation machine, always use the wheel's center pilot hole. This is the primary centering mechanism on all GM wheels; the bolt holes are secondary. Usually a back cone method to the machine should be used. For added accuracy and repeatability, a flange plate should be used to clamp the wheel onto the cone and machine. This system is offered by all balancer manufacturers in GM's dealer program. - Any type of service equipment that removes tread rubber by grinding, buffing or truing is NOT recommended, and may void the tire warranty. However, tires may have been ground by the tire company as part of their tire manufacturing process. This is a legitimate procedure. Steering Wheel Shake Worksheet When diagnosing vibration concerns, use the following worksheet in conjunction with the appropriate Vibration Analysis-Road testing procedure in the Vibration Correction sub-section in SI. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3682 Refer to the appropriate section of SI for specifications and repair procedures that are related to the vibration concern. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 05-03-10-003F > Apr > 10 > Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels Wheels: Customer Interest Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels TECHNICAL Bulletin No.: 05-03-10-003F Date: April 27, 2010 Subject: Low Tire Pressure, Leaking Cast Aluminum Wheels (Repair with Adhesive Sealant) Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with Cast Aluminum Wheels Supercede: This bulletin is being revised to update the model years and the bulletin reference information. Please discard Corporate Bulletin Number 05-03-10-003E (Section 03 - Suspension). Condition Some customers may comment on a low tire pressure condition. Diagnosis of the low tire pressure condition indicates an air leak through the cast aluminum wheel. Cause Porosity in the cast aluminum wheel may be the cause. Notice This bulletin specifically addresses issues related to the wheel casting that may result in an air leak. For issues related to corrosion of the wheel in service, please refer to Corporate Bulletin Number 08-03-10-006C - Tire Slowly Goes Flat, Tire Air Loss, Low Tire Pressure Warning Light Illuminated, Aluminum Wheel Bead Seat Corrosion (Clean and Resurface Wheel Bead Seat). Correction 1. Remove the tire and wheel assembly from the vehicle. Refer to the appropriate service procedure in SI. 2. Locate the leaking area by inflating the tire to 276 kPa (40 psi) and dipping the tire/wheel assembly in a water bath, or use a spray bottle with soap and water to locate the specific leak location. Important - If the porosity leak is located in the bead area of the aluminum rim (where the tire meets the rim), the wheel should be replaced. - If two or more leaks are located on one wheel, the wheel should be replaced. 3. If air bubbles are observed, mark the location. - If the leak location is on the tire/rubber area, refer to Corporate Bulletin Number 04-03-10-001F Tire Puncture Repair Procedures for All Cars and Light Duty Trucks. - If the leak is located on the aluminum wheel area, continue with the next step. 4. Inscribe a mark on the tire at the valve stem in order to indicate the orientation of the tire to the wheel. 5. Dismount the tire from the wheel. Refer to Tire Mounting and Dismounting. 6. Remove the tire pressure sensor. Refer to Tire Pressure Sensor removal procedure in SI. 7. Scuff the INSIDE rim surface at the leak area with #80 grit paper and clean the area with general purpose cleaner, such as 3M(R) General Purpose Adhesive Cleaner, P/N 08984, or equivalent. 8. Apply a 3 mm (0.12 in) thick layer of Silicone - Adhesive/Sealant, P/N 12378478 (in Canada, use 88900041), or equivalent, to the leak area. 9. Allow for the adhesive/sealant to dry. Notice Caution must be used when mounting the tire so as not to damage the sealer. Damaging the repair area may result in an air leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 05-03-10-003F > Apr > 10 > Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels > Page 3687 10. Align the inscribed mark on the tire with the valve stem on the wheel. 11. Reinstall the Tire Pressure Sensor. Refer to Tire Pressure Sensor installation procedure in SI. 12. Mount the tire on the wheel. Refer to Tire Mounting and Dismounting. 13. Pressurize the tire to 276 kPa (40 psi) and inspect for leaks. 14. Adjust tire pressure to meet the placard specification. 15. Balance the tire/wheel assembly. Refer to Tire and Wheel Assembly Balancing - Off-Vehicle. 16. Install the tire and wheel assembly onto the vehicle. Refer to the appropriate service procedure in SI. Parts Information Warranty Information (excluding Saab U.S. Models) Important The Silicone - Adhesive/Sealant comes in a case quantity of six. ONLY charge warranty one tube of adhesive/sealant per wheel repair. For vehicles repaired under warranty, use: One leak repair per wheel. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON Wheels: Customer Interest Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON TECHNICAL Bulletin No.: 08-03-10-006C Date: April 27, 2010 Subject: Tire Slowly Goes Flat, Tire Air Loss, Low Tire Pressure Warning Light Illuminated, Aluminum Wheel Bead Seat Corrosion (Clean and Resurface Wheel Bead Seat) Models: 2000-2011 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2010 HUMMER H3 2005-2009 Saab 9-7X Supercede: This bulletin is being revised to update the model years. Please discard Corporate Bulletin Number 08-03-10-006B (Section 03 - Suspension). Condition Some customers may comment on a tire that slowly loses air pressure over a period of days or weeks. Cause Abrasive elements in the environment may intrude between the tire and wheel at the bead seat. There is always some relative motion between the tire and wheel (when the vehicle is driven) and this motion may cause the abrasive particles to wear the wheel and tire materials. As the wear continues, there may also be intrusion at the tire/wheel interface by corrosive media from the environment. Eventually a path for air develops and a 'slow' leak may ensue. This corrosion may appear on the inboard or outboard bead seating surface of the wheel. This corrosion will not be visible until the tire is dismounted from the wheel. Notice This bulletin specifically addresses issues related to wheel bead seat corrosion that may result in an air leak. For issues related to porosity of the wheel casting that may result in an air leak, please refer to Corporate Bulletin Number 05-03-10-006F - Low Tire Pressure, Leaking Cast Aluminum Wheels (Repair with Adhesive Sealant) Correction In most cases, this type of air loss can be corrected by following the procedure below. Important DO NOT replace a wheel for slow air loss unless you have evaluated and/or tried to repair the wheel with the procedure below. Notice The repair is no longer advised or applicable for chromed aluminum wheels. 1. Remove the wheel and tire assembly for diagnosis. Refer to Tire and Wheel Removal and Installation in SI. 2. After a water dunk tank leak test, if you determine the source of the air leak to be around the bead seat of the wheel, dismount the tire to examine the bead seat. Shown below is a typical area of bead seat corrosion.Typical Location of Bead Seat Corrosion Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3692 Important Other forms of slow air leaks are possible. If the body of the tire, valve stem and wheel flange show no signs of air seepage, refer to Corporate Bulletin Number 05-03-10-003D for additional information on possible wheel porosity issues. 3. Bead seat corrosion is identified by what appears like blistering of the wheel finish, causing a rough or uneven surface that is difficult for the tire to maintain a proper seal on. Below is a close-up photo of bead seat corrosion on an aluminum wheel that was sufficient to cause slow air loss. Close-Up of Bead Seat Corrosion 4. If corrosion is found on the wheel bead seat, measure the affected area as shown below. - For vehicles with 32,186 km (20,000 mi) or less, the total allowable combined linear area of repairable corrosion is 100 mm (4 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. - For vehicles that have exceeded 32,186 km (20,000 mi), the total allowable combined linear area of repairable corrosion is 200 mm (8 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. 5. In order to correct the wheel leak, use a clean-up (fine cut) sanding disc or biscuit to remove the corrosion and any flaking paint. You should remove the corrosion back far enough until you reach material that is stable and firmly bonded to the wheel. Try to taper the edge of any flaking paint as best you can in order to avoid sharp edges that may increase the chance of a leak reoccurring. The photo below shows an acceptable repaired surface. Notice Corrosion that extends up the lip of the wheel, where after the clean-up process it would be visible with the tire mounted, is only acceptable on the inboard flange. The inboard flange is not visible with the wheel assembly in the mounted position. If any loose coatings or corrosion extend to the visible surfaces on the FACE of the wheel, that wheel must be replaced. Important Remove ONLY the material required to eliminate the corrosion from the bead seating surface. DO NOT remove excessive amounts of material. ALWAYS keep the sealing surface as smooth and level as possible. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3693 Acceptably Prepared (Cleaned-Up) Wheel Surface 6. Once the corrosion has been eliminated, you should coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealant or equivalent. Commercially available bead sealants are black rubber-like coatings that will permanently fill and seal the resurfaced bead seat. At 21°C (70°F) ambient temperature, this sealant will set-up sufficiently for tire mounting in about 10 minutes.Coated and Sealed Bead Seat 7. Remount the tire and install the repaired wheel and tire assembly. Refer to Tire and Wheel Removal and Installation in SI. Parts Information Patch Brand Bead Sealer is available from Myers Tires at 1-800-998-9897 or on the web at www.myerstiresupply.com. The one-quart size can of sealer will repair about 20 wheels. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use: Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Customer Interest: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3694 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion Wheels: All Technical Service Bulletins Wheels - Chrome Wheel Staining/Pitting/Corrosion INFORMATION Bulletin No.: 00-03-10-002F Date: April 21, 2011 Subject: Chemical Staining, Pitting, Corrosion and/or Spotted Appearance of Chromed Aluminum Wheels Models: 2012 and Prior GM Cars and Trucks Supercede: This bulletin is being revised to update model years, suggest additional restorative products and add additional corrosion information. Please discard Corporate Bulletin Number 00-03-10-002E (Section 03 - Suspension). Important You may give a copy of this bulletin to the customer. What is Chemical Staining of Chrome Wheels? Figure 1 Chemical staining in most cases results from acid based cleaners (refer to Figure 1 for an example). These stains are frequently milky, black, or greenish in appearance. They result from using cleaning solutions that contain acids on chrome wheels. Soap and water is usually sufficient to clean wheels. If the customer insists on using a wheel cleaner they should only use one that specifically states that it is safe for chromed wheels and does not contain anything in the following list. (Dealers should also survey any products they use during prep or normal cleaning of stock units for these chemicals.) - Ammonium Bifluoride (fluoride source for dissolution of chrome) - Hydrofluoric Acid (directly dissolves chrome) - Hydrochloric Acid (directly dissolves chrome) - Sodium Dodecylbenzenesulfonic Acid - Sulfamic Acid - Phosphoric Acid - Hydroxyacetic Acid Notice Many wheel cleaner instructions advise to take care to avoid contact with painted surfaces. Most customers think of painted surfaces as the fenders, quarter panels and other exterior sheet metal. Many vehicles have painted brake calipers. Acidic wheel cleaners may craze, crack, or discolor the paint on the brake calipers. Damage from wheel cleaners is not covered under the vehicle new car warranty. Soap and water applied with a soft brush is usually all that is required to clean the calipers. Whenever any wheel cleaner is used, it must be THOROUGHLY rinsed off of the wheel with clean, clear water. Special care must be taken to rinse under the hub cap, balance weights, wheel nuts, lug nut caps, between the wheel cladding and off the back side of the wheel. Wheels returned to the Warranty Parts Center (WPC) that exhibit damage from wheel cleaners most often have the damage around and under the wheel weight where the cleaner was incompletely flushed away. Notice Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3700 Do not use cleaning solutions that contain hydrofluoric, oxalic and most other acids on chrome wheels (or any wheels). If the customer is unsure of the chemical make-up of a particular wheel cleaner, it should be avoided. For wheels showing signs of milky staining from acidic cleaners, refer to Customer Assistance and Instructions below. Warranty of Stained Chrome Wheels Stained wheels are not warrantable. Most acid based cleaners will permanently stain chrome wheels. Follow-up with dealers has confirmed that such cleaners were used on wheels that were returned to the Warranty Parts Center (WPC). Any stained wheels received by the WPC will be charged back to the dealership. To assist the customer, refer to Customer Assistance and Instructions below. Pitting or Spotted Appearance of Chrome Wheels Figure 2 A second type or staining or finish disturbance may result from road chemicals, such as calcium chloride used for dust control of unpaved roads. The staining will look like small pitting (refer to Figure 2). This staining will usually be on the leading edges of each wheel spoke, but may be uniformly distributed. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Important Road chemicals, such as calcium chloride used for dust control of unpaved roads, can also stain chrome wheels. The staining will look like small pitting. This staining will usually be on the leading edges of each wheel spoke. This is explained by the vehicle traveling in the forward direction while being splashed by the road chemical. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Warranty of Pitted or Spotted Chrome Wheels Wheels returned with pitting or spotting as a result of road chemicals may be replaced one time. Damage resulting from contact with these applied road chemicals is corrosive to the wheels finish and may cause damage if the wheels are not kept clean. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean if they are operating the vehicle in an area that applies calcium chloride or other dust controlling chemicals! "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). "Stardust" Corrosion of Chrome Wheels Figure 3 A third type of finish disturbance results from prolonged exposure to brake dust and resultant penetration of brake dust through the chrome. As brakes are applied hot particles of brake material are thrown off and tend to be forced through the leading edge of the wheel spoke windows by airflow. These Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3701 hot particles embed themselves in the chrome layer and create a small pit. If the material is allowed to sit on the wheel while it is exposed to moisture or salt, it will corrode the wheel beneath the chrome leaving a pit or small blister in the chrome. Heavy brake dust build-up should be removed from wheels by using GM Chrome Cleaner and Polish, P/N 1050173 (in Canada use 10953013). For moderate cleaning, light brake dust build-up or water spots use GM Swirl Remover Polish, P/N 12377965 (in Canada, use Meguiars Plast-X(TM) Clear Plastic Cleaner and Polish #G12310C**). After cleaning, the wheel should be waxed using GM Cleaner Wax, P/N 12377966 (in Canada, use Meguiars Cleaner Wax #M0616C**), which will help protect the wheel from brake dust and reduce adhesion of any brake dust that gets on the wheel surface. For general maintenance cleaning, PEEK Metal Polish† may be used. It will clean and shine the chrome and leave behind a wax coating that may help protect the finish. Warranty of Stardust Corroded Chrome Wheels Wheels returned with pitting or spotting as a result of neglect and brake dust build-up may be replaced one time. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean and free of prolonged exposure to brake dust build-up. "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). Customer Assistance and Instructions GM has looked for ways customers may improve the appearance of wheels damaged by acidic cleaners. The following product and procedure has been found to dramatically improve the appearance of stained wheels. For wheels that have milky stains caused by acidic cleaners try the following: Notice THE 3M CHROME AND METAL POLISH REQUIRED FOR THIS PROCEDURE IS AN EXTREMELY AGGRESSIVE POLISH/CLEANER. THE WHEELS MUST BE CLEANED BEFORE APPLICATION TO AVOID SCRATCHING THE WHEEL SURFACE. THIS PRODUCT WILL REDUCE THE THICKNESS OF THE CHROME PLATING ON THE WHEEL AND IF USED INCORRECTLY OR EXCESSIVELY MAY REMOVE THE CHROME PLATING ALL TOGETHER, EXPOSING A LESS BRIGHT AND BRASSY COLORED SUB-LAYER. FOLLOW INSTRUCTIONS EXACTLY. 1. Wash the wheels with vigorously with soap and water. This step will clean and may reduce wheel staining. Flood all areas of the wheel with water to rinse. 2. Dry the wheels completely. Notice Begin with a small section of the wheel and with light pressure buff off polish and examine results. ONLY apply and rub with sufficient force and time to remove enough staining that you are satisfied with the results. Some wheels may be stained to the extent that you may only achieve a 50% improvement while others may be able to be restored to the original lustre. IN ALL CASES, only apply until the results are satisfactory. 3. Apply 3M Chrome and Metal Polish #39527* with a clean terry cloth towel. As you apply the polish, the staining will be diminished. 4. When dry, buff off the polish with a clean portion of the towel. 5. Repeat application of the 3M Chrome and Metal Polish until satisfied with the results. If continued applications fail to improve the appearance further discontinue use. This procedure will improve the appearance of the wheels and may, with repeated applications, restore the finish dramatically. For wheels that exhibit spotting from road chemicals the above procedure may marginally improve the condition but will not restore the finish or remove the pitting. In this type of staining the wheel finish has actually been removed in spots and no manner of cleaning will restore the finish. †*We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3702 *This product is currently available from 3M. To obtain information for your local retail location please call 3M at 1-888-364-3577. **This product is currently available from Meguiars (Canada). To obtain information for your local retail location please call Meguiars at 1-800-347-5700 or at www.meguiarscanada.com. ^ This product is currently available from Tri-Peek International. To obtain information for your local retail location please call Tri-Peek at 1-877-615-4272 or at www.tripeek.com. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 99-08-51-007E > Mar > 11 > Wheels/Tires - Refinishing Aluminum Wheels Wheels: All Technical Service Bulletins Wheels/Tires - Refinishing Aluminum Wheels INFORMATION Bulletin No.: 99-08-51-007E Date: March 17, 2011 Subject: Refinishing Aluminum Wheels Models: 2012 and Prior GM Passenger Cars and Trucks Supercede: This bulletin is being revised to add additional model years. Please discard Corporate Bulletin Number 99-08-51-007D (Section 08 - Body and Accessories). This bulletin updates General Motor's position on refinishing aluminum wheels. GM does not endorse any repairs that involve welding, bending, straightening or re-machining. Only cosmetic refinishing of the wheel's coatings, using recommended procedures, is allowed. Evaluating Damage In evaluating damage, it is the GM Dealer's responsibility to inspect the wheel for corrosion, scrapes, gouges, etc. The Dealer must insure that such damage is not deeper than what can be sanded or polished off. The wheel must be inspected for cracks. If cracks are found, discard the wheel. Any wheels with bent rim flanges must not be repaired or refinished. Wheels that have been refinished by an outside company must be returned to the same vehicle. The Dealer must record the wheel ID stamp or the cast date on the wheel in order to assure this requirement. Refer to Refinisher's Responsibility - Outside Company later in this bulletin. Aluminum Wheel Refinishing Recommendations - Chrome-plated aluminum wheels Re-plating these wheels is not recommended. - Polished aluminum wheels These wheels have a polyester or acrylic clearcoat on them. If the clearcoat is damaged, refinishing is possible. However, the required refinishing process cannot be performed in the dealer environment. Refer to Refinisher's Responsibility - Outside Company later in this bulletin. - Painted aluminum wheels These wheels are painted using a primer, color coat, and clearcoat procedure. If the paint is damaged, refinishing is possible. As with polished wheels, all original coatings must be removed first. Media blasting is recommended. Refer to GM Aluminum Refinishing Bulletin #53-17-03A for the re-painting of this type of wheel. - Bright, machined aluminum wheels These wheels have a polyester or acrylic clearcoat on them. In some cases, the recessed "pocket" areas of the wheel may be painted. Surface refinishing is possible. The wheel must be totally stripped by media blasting or other suitable means. The wheel should be resurfaced by using a sanding process rather than a machining process. This allows the least amount of material to be removed. Important Do not use any re-machining process that removes aluminum. This could affect the dimensions and function of the wheel. Painting is an option to re-clearcoating polished and bright machined aluminum wheels. Paint will better mask any surface imperfections and is somewhat more durable than clearcoat alone. GM recommends using Corsican SILVER WAEQ9283 for a fine "aluminum-like" look or Sparkle SILVER WA9967 for a very bright look. As an option, the body color may also be used. When using any of the painting options, it is recommended that all four wheels be refinished in order to maintain color uniformity. Refer to GM Aluminum Refinishing Bulletin #53-17-03A for specific procedures and product recommendations. Refinisher's Responsibility - Outside Company Important Some outside companies are offering wheel refinishing services. Such refinished wheels will be permanently marked by the refinisher and are warranted by the refinisher. Any process that re-machines or otherwise re-manufactures the wheel should not be used. A refinisher's responsibility includes inspecting for cracks using the Zyglo system or the equivalent. Any cracked wheels must not be refinished. No welding, hammering or reforming of any kind is allowed. The wheel ID must be recorded and follow the wheel throughout the process in order to assure that the same wheel is returned. A plastic media blast may be used for clean up of the wheel. Hand and/or lathe sanding of the machined surface and the wheel window is allowed. Material removal, though, must be kept to a minimum. Re-machining of the wheel is not allowed. Paint and/or clear coat must not be present on the following surfaces: the nut chamfers, the wheel mounting surfaces and the wheel pilot hole. The refinisher must permanently ID stamp the wheel and warrant the painted/clearcoated surfaces for a minimum of one year or the remainder of the new vehicle warranty, whichever is Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 99-08-51-007E > Mar > 11 > Wheels/Tires - Refinishing Aluminum Wheels > Page 3707 longer. Important Whenever a wheel is refinished, the mounting surface and the wheel nut contact surfaces must not be painted or clearcoated. Coating these surfaces could affect the wheel nut torque. When re-mounting a tire on an aluminum wheel, coated balance weights must be used in order to reduce the chance of future cosmetic damage. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions Wheels: All Technical Service Bulletins Wheels - Changing Procedures/Precautions INFORMATION Bulletin No.: 06-03-10-010A Date: June 09, 2010 Subject: Information on Proper Wheel Changing Procedures and Cautions Models: 2011 and Prior GM Passenger Cars and Trucks 2010 and Prior HUMMER Models 2005-2009 Saab 9-7X 2005-2009 Saturn Vehicles Attention: Complete wheel changing instructions for each vehicle line can be found under Tire and Wheel Removal and Installation in Service Information (SI). This bulletin is intended to quickly review and reinforce simple but vital procedures to reduce the possibility of achieving low torque during wheel installation. Always refer to SI for wheel lug nut torque specifications and complete jacking instructions for safe wheel changing. Supercede: This bulletin is being revised to include the 2011 model year and update the available special tool list. Please discard Corporate Bulletin Number 06-03-10-010 (Section 03 Suspension). Frequency of Wheel Changes - Marketplace Driven Just a few years ago, the increasing longevity of tires along with greater resistance to punctures had greatly reduced the number of times wheels were removed to basically required tire rotation intervals. Today with the booming business in accessory wheels/special application tires (such as winter tires), consumers are having tire/wheel assemblies removed - replaced - or installed more than ever. With this increased activity, it opens up more of a chance for error on the part of the technician. This bulletin will review a few of the common concerns and mistakes to make yourself aware of. Proper Servicing Starts With the Right Tools The following tools have been made available to assist in proper wheel and tire removal and installation. - J 41013 Rotor Resurfacing Kit (or equivalent) - J 42450-A Wheel Hub Resurfacing Kit (or equivalent) Corroded Surfaces One area of concern is corrosion on the mating surfaces of the wheel to the hub on the vehicle. Excessive corrosion, dirt, rust or debris built up on these surfaces can mimic a properly tightened wheel in the service stall. Once the vehicle is driven, the debris may loosen, grind up or be washed away from water splash. This action may result in clearance at the mating surface of the wheel and an under-torqued condition. Caution Before installing a wheel, remove any buildup on the wheel mounting surface and brake drum or brake disc mounting surface. Installing wheels with poor metal-to-metal contact at the mounting surfaces can cause wheel nuts to loosen. This may cause a wheel to come off when the vehicle is moving, possibly resulting in a loss of control or personal injury. Whenever you remove the tire/wheel assemblies, you must inspect the mating surfaces. If corrosion is found, you should remove the debris with a die grinder equipped with a fine sanding pad, wire brush or cleaning disc. Just remove enough material to assure a clean, smooth mating surface. The J 41013 (or equivalent) can be used to clean the following surfaces: - The hub mounting surface - The brake rotor mounting surface - The wheel mounting surface Use the J 42450-A (or equivalent) to clean around the base of the studs and the hub. Lubricants, Grease and Fluids Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3712 Some customers may use penetrating oils, grease or other lubricants on wheel studs to aid in removal or installation. Always use a suitable cleaner/solvent to remove these lubricants prior to installing the wheel and tire assemblies. Lubricants left on the wheel studs may cause improper readings of wheel nut torque. Always install wheels to clean, dry wheel studs ONLY. Notice Lubricants left on the wheel studs or vertical mounting surfaces between the wheel and the rotor or drum may cause the wheel to work itself loose after the vehicle is driven. Always install wheels to clean, dry wheel studs and surfaces ONLY. Beginning with 2011 model year vehicles, put a light coating of grease, GM P/N 1051344 (in Canada, P/N 9930370), on the inner surface of the wheel pilot hole to prevent wheel seizure to the axle or bearing hub. Wheel Stud and Lug Nut Damage Always inspect the wheel studs and lug nuts for signs of damage from crossthreading or abuse. You should never have to force wheel nuts down the stud. Lug nuts that are damaged may not retain properly, yet give the impression of fully tightening. Always inspect and replace any component suspected of damage. Tip Always start wheel nuts by hand! Be certain that all wheel nut threads have been engaged BEFORE tightening the nut. Important If the vehicle has directional tread tires, verify the directional arrow on the outboard side of the tire is pointing in the direction of forward rotation. Wheel Nut Tightening and Torque Improper wheel nut tightening can lead to brake pulsation and rotor damage. In order to avoid additional brake repairs, evenly tighten the wheel nuts to the proper torque specification as shown for each vehicle in SI. Always observe the proper wheel nut tightening sequence as shown below in order to avoid trapping the wheel on the wheel stud threads or clamping the wheel slightly off center resulting in vibration. The Most Important Service You Provide While the above information is well known, and wheel removal so common, technicians run the risk of becoming complacent on this very important Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3713 service operation. A simple distraction or time constraint that rushes the job may result in personal injury if the greatest of care is not exercised. Make it a habit to double check your work and to always side with caution when installing wheels. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) Wheels: All Technical Service Bulletins Wheels/Tires - Tire Radial Force Variation (RFV) INFORMATION Bulletin No.: 00-03-10-006F Date: May 04, 2010 Subject: Information on Tire Radial Force Variation (RFV) Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X 2000-2005 Saturn L Series 2003-2007 Saturn ION Supercede: This bulletin is being revised to considerably expand the available information on Radial Force Variation (RFV) and should be reviewed in whole. Please discard Corporate Bulletin Number 00-03-10-006E (Section 03 - Suspension). Important - Before measuring tires on equipment such as the Hunter GSP9700, the vehicle MUST be driven a minimum of 16 km (10 mi) to ensure removal of any flat-spotting. Refer to Corporate Bulletin Number 03-03-10-007E - Tire/Wheel Characteristics of GM Original Equipment Tires. - Equipment such as the Hunter GSP9700 MUST be calibrated prior to measuring tire/wheel assemblies for each vehicle. The purpose of this bulletin is to provide guidance to GM dealers when using tire force variation measurement equipment, such as the Hunter GSP9700. This type of equipment can be a valuable tool in diagnosing vehicle ride concerns. The most common ride concern involving tire radial force variation is highway speed shake on smooth roads. Tire related smooth road highway speed shake can be caused by three conditions: imbalance, out of round and tire force variation. These three conditions are not necessarily related. All three conditions must be addressed. Imbalance is normally addressed first, because it is the simpler of the three to correct. Off-vehicle, two plane dynamic wheel balancers are readily available and can accurately correct any imbalance. Balancer calibration and maintenance, proper attachment of the wheel to the balancer, and proper balance weights, are all factors required for a quality balance. However, a perfectly balanced tire/wheel assembly can still be "oval shaped" and cause a vibration. Before balancing, perform the following procedures. Tire and Wheel Diagnosis 1. Set the tire pressure to the placard values. 2. With the vehicle raised, ensure the wheels are centered on the hub by loosening all wheel nuts and hand-tightening all nuts first by hand while shaking the wheel, then torque to specifications using a torque wrench, NOT a torque stick. 3. Visually inspect the tires and the wheels. Inspect for evidence of the following conditions and correct as necessary: - Missing balance weights - Bent rim flange - Irregular tire wear - Incomplete bead seating - Tire irregularities (including pressure settings) - Mud/ice build-up in wheel - Stones in the tire tread - Remove any aftermarket wheels and/or tires and restore vehicle to original condition prior to diagnosing a smooth road shake condition. 4. Road test the vehicle using the Electronic Vibration Analyzer (EVA) essential tool. Drive for a sufficient distance on a known, smooth road surface to duplicate the condition. Determine if the vehicle is sensitive to brake apply. If the brakes are applied lightly and the pulsation felt in the steering wheel increases, refer to the Brakes section of the service manual that deals with brake-induced pulsation. If you can start to hear the vibration as a low boom noise (in addition to feeling it), but cannot see it, the vehicle likely has a first order (one pulse per propshaft revolution) driveline vibration. Driveline first order vibrations are high enough in frequency that most humans can start to hear them at highway speeds, but are too high to be able to be easily seen. These issues can be caused by driveline imbalance or misalignment. If the vehicle exhibits this low boom and the booming pulses in-and-out on a regular basis (like a throbbing), chances are good that the vehicle could have driveline vibration. This type Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3718 of vibration is normally felt more in the "seat of the pants" than the steering wheel. 5. Next, record the Hertz (Hz) reading as displayed by the EVA onto the tire data worksheet found at the end of this bulletin. This should be done after a tire break-in period of at least 16 km (10 mi) at 72 km/h (45 mph) or greater, in order to eliminate any possible tire flat-spotting. This reading confirms what the vehicle vibration frequency is prior to vehicle service and documents the amount of improvement occurring as the result of the various steps taken to repair. Completing the Steering Wheel Shake Worksheet below is required. A copy of the completed worksheet must be saved with the R.O. and a copy included with any parts returned to the Warranty Parts Center for analysis. A reading of 35 to 50 Hz typically indicates a first order propshaft vibration. If this is the situation, refer to Corporate Bulletin Number 08-07-30-044D. Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration and if this is the reading obtained, continue using this bulletin. If the tire 1st order vibration goes away and stays away during this evaluation, the cause is likely tire flat-spotting. Tire flat-spotting vibration may come and go at any speed over 72 km/h (45 mph) during the first 10 minutes of operation, if vibration continues after 10 minutes of driving at speeds greater than 72 km/h (45 mph), tire flat-spotting can be ruled out as the cause for vibration. 6. If flat-spotting is the cause, provide the explanation that this has occurred due to the vehicle being parked for long periods of time and that the nature of the tire is to take a set. Refer to Corporate Bulletin Number 03-03-10-007E: Information on Tire/Wheel Characteristics (Vibration, Balance, Shake, Flat Spotting) of GM Original Equipment Tires. 7. If the road test indicates a shake/vibration exists, check the imbalance of each tire/wheel assembly on a known, calibrated, off-car dynamic balancer.Make sure the mounting surface of the wheel and the surface of the balancer are absolutely clean and free of debris. Be sure to chose the proper cone/collet for the wheel, and always use the pilot bore for centering. Never center the wheel using the hub-cap bore since it is not a precision machined surface. If any assembly calls for more than 1/4 ounce on either rim flange, remove all balance weights and rebalance to as close to zero as possible. If you can see the vibration (along with feeling it) in the steering wheel (driving straight without your hands on the wheel), it is very likely to be a tire/wheel first order (one pulse per revolution) disturbance. First order disturbances can be caused by imbalance as well as non-uniformities in tires, wheels or hubs. This first order frequency is too low for a human to hear, but if the amplitude is high enough, it can be seen. If a vibration or shake still exists after balancing, any out of round conditions, of the wheel, and force variation conditions of the tire, must be addressed. Equipment such as the Hunter GSP9700 can address both (it is also a wheel balancer). Tire radial force vibration (RFV) can be defined as the amount of stiffness variation the tire will produce in one revolution under a constant load. Radial force variation is what the vehicle feels because the load (weight) of the vehicle is always on the tires. Although free runout of tires (not under load) is not always a good indicator of a smooth ride, it is critical that total tire/wheel assembly runout be within specification. Equipment such as the Hunter GSP9700 loads the tire, similar to on the vehicle, and measures radial force variation of the tire/wheel assembly. Note that the wheel is affecting the tire's RFV measurement at this point. To isolate the wheel, its runout must be measured. This can be easily done on the Hunter, without the need to set up dial indicators. If the wheel meets the runout specification, the tire's RFV can then be addressed. After measuring the tire/wheel assembly under load, and the wheel alone, the machine then calculates (predicts) the radial force variation of the tire. However, because this is a prediction that can include mounting inaccuracies, and the load wheel is much smaller in diameter than used in tire production, this type of service equipment should NOT be used to audit new tires. Rather, it should be used as a service diagnostic tool to minimize radial force variation of the tire/wheel assembly. Equipment such as the Hunter GSP9700 does an excellent job of measuring wheel runout, and of finding the low point of the wheel (for runout) and the high point of the tire (for radial force variation). This allows the tire to be matched mounted to the wheel for lowest tire/wheel assembly force variation. The machine will simplify this process into easy steps. The following assembly radial force variation numbers should be used as a guide: When measuring RFV and match mounting tires perform the following steps. Measuring Wheel Runout and Assembly Radial Force Variation Important The completed worksheet at the end of this bulletin must be attached to the hard copy of the repair order. - Measure radial force variation and radial runout. - If a road force/balancing machine is used, record the radial force variation (RFV) on the worksheet at the end of this bulletin. It may be of benefit to have the lowest RFV assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires onto the subject vehicle. - If a runout/balancing machine is used, record the radial runout of the tire/wheel assemblies on the worksheet at the end of this bulletin. If one or more of the tire/wheel assemblies are more than.040 in (1.02 mm), match mount the tire to the wheel to get below.040 in (1.02 mm). For sensitive customers, readings of 0.030 inch (0.76 mm) or less are preferable, it may also be of benefit to have the lowest runout assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3719 onto the subject vehicle. - After match mounting, the tire/wheel assembly must be rebalanced. If match mounting tires to in-spec wheels produces assembly values higher than these, tire replacement may be necessary. Replacing tires at lower values will probably mean good tires are being condemned. Because tires can sometimes become temporarily flat-spotted, which will affect force variation, it is important that the vehicle be driven at least 16 km (10 mi) prior to measuring. Tire pressure must also be adjusted to the usage pressure on the vehicle's tire placard prior to measuring. Most GM vehicles will tolerate radial force variation up to these levels. However, some vehicles are more sensitive, and may require lower levels. Also, there are other tire parameters that equipment such as the Hunter GSP9700 cannot measure that may be a factor. In such cases, TAC should be contacted for further instructions. Important - When mounting a GM wheel to a wheel balancer/force variation machine, always use the wheel's center pilot hole. This is the primary centering mechanism on all GM wheels; the bolt holes are secondary. Usually a back cone method to the machine should be used. For added accuracy and repeatability, a flange plate should be used to clamp the wheel onto the cone and machine. This system is offered by all balancer manufacturers in GM's dealer program. - Any type of service equipment that removes tread rubber by grinding, buffing or truing is NOT recommended, and may void the tire warranty. However, tires may have been ground by the tire company as part of their tire manufacturing process. This is a legitimate procedure. Steering Wheel Shake Worksheet When diagnosing vibration concerns, use the following worksheet in conjunction with the appropriate Vibration Analysis-Road testing procedure in the Vibration Correction sub-section in SI. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3720 Refer to the appropriate section of SI for specifications and repair procedures that are related to the vibration concern. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 05-03-10-003F > Apr > 10 > Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels Wheels: All Technical Service Bulletins Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels TECHNICAL Bulletin No.: 05-03-10-003F Date: April 27, 2010 Subject: Low Tire Pressure, Leaking Cast Aluminum Wheels (Repair with Adhesive Sealant) Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with Cast Aluminum Wheels Supercede: This bulletin is being revised to update the model years and the bulletin reference information. Please discard Corporate Bulletin Number 05-03-10-003E (Section 03 - Suspension). Condition Some customers may comment on a low tire pressure condition. Diagnosis of the low tire pressure condition indicates an air leak through the cast aluminum wheel. Cause Porosity in the cast aluminum wheel may be the cause. Notice This bulletin specifically addresses issues related to the wheel casting that may result in an air leak. For issues related to corrosion of the wheel in service, please refer to Corporate Bulletin Number 08-03-10-006C - Tire Slowly Goes Flat, Tire Air Loss, Low Tire Pressure Warning Light Illuminated, Aluminum Wheel Bead Seat Corrosion (Clean and Resurface Wheel Bead Seat). Correction 1. Remove the tire and wheel assembly from the vehicle. Refer to the appropriate service procedure in SI. 2. Locate the leaking area by inflating the tire to 276 kPa (40 psi) and dipping the tire/wheel assembly in a water bath, or use a spray bottle with soap and water to locate the specific leak location. Important - If the porosity leak is located in the bead area of the aluminum rim (where the tire meets the rim), the wheel should be replaced. - If two or more leaks are located on one wheel, the wheel should be replaced. 3. If air bubbles are observed, mark the location. - If the leak location is on the tire/rubber area, refer to Corporate Bulletin Number 04-03-10-001F Tire Puncture Repair Procedures for All Cars and Light Duty Trucks. - If the leak is located on the aluminum wheel area, continue with the next step. 4. Inscribe a mark on the tire at the valve stem in order to indicate the orientation of the tire to the wheel. 5. Dismount the tire from the wheel. Refer to Tire Mounting and Dismounting. 6. Remove the tire pressure sensor. Refer to Tire Pressure Sensor removal procedure in SI. 7. Scuff the INSIDE rim surface at the leak area with #80 grit paper and clean the area with general purpose cleaner, such as 3M(R) General Purpose Adhesive Cleaner, P/N 08984, or equivalent. 8. Apply a 3 mm (0.12 in) thick layer of Silicone - Adhesive/Sealant, P/N 12378478 (in Canada, use 88900041), or equivalent, to the leak area. 9. Allow for the adhesive/sealant to dry. Notice Caution must be used when mounting the tire so as not to damage the sealer. Damaging the repair area may result in an air leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 05-03-10-003F > Apr > 10 > Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels > Page 3725 10. Align the inscribed mark on the tire with the valve stem on the wheel. 11. Reinstall the Tire Pressure Sensor. Refer to Tire Pressure Sensor installation procedure in SI. 12. Mount the tire on the wheel. Refer to Tire Mounting and Dismounting. 13. Pressurize the tire to 276 kPa (40 psi) and inspect for leaks. 14. Adjust tire pressure to meet the placard specification. 15. Balance the tire/wheel assembly. Refer to Tire and Wheel Assembly Balancing - Off-Vehicle. 16. Install the tire and wheel assembly onto the vehicle. Refer to the appropriate service procedure in SI. Parts Information Warranty Information (excluding Saab U.S. Models) Important The Silicone - Adhesive/Sealant comes in a case quantity of six. ONLY charge warranty one tube of adhesive/sealant per wheel repair. For vehicles repaired under warranty, use: One leak repair per wheel. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON Wheels: All Technical Service Bulletins Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON TECHNICAL Bulletin No.: 08-03-10-006C Date: April 27, 2010 Subject: Tire Slowly Goes Flat, Tire Air Loss, Low Tire Pressure Warning Light Illuminated, Aluminum Wheel Bead Seat Corrosion (Clean and Resurface Wheel Bead Seat) Models: 2000-2011 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2010 HUMMER H3 2005-2009 Saab 9-7X Supercede: This bulletin is being revised to update the model years. Please discard Corporate Bulletin Number 08-03-10-006B (Section 03 - Suspension). Condition Some customers may comment on a tire that slowly loses air pressure over a period of days or weeks. Cause Abrasive elements in the environment may intrude between the tire and wheel at the bead seat. There is always some relative motion between the tire and wheel (when the vehicle is driven) and this motion may cause the abrasive particles to wear the wheel and tire materials. As the wear continues, there may also be intrusion at the tire/wheel interface by corrosive media from the environment. Eventually a path for air develops and a 'slow' leak may ensue. This corrosion may appear on the inboard or outboard bead seating surface of the wheel. This corrosion will not be visible until the tire is dismounted from the wheel. Notice This bulletin specifically addresses issues related to wheel bead seat corrosion that may result in an air leak. For issues related to porosity of the wheel casting that may result in an air leak, please refer to Corporate Bulletin Number 05-03-10-006F - Low Tire Pressure, Leaking Cast Aluminum Wheels (Repair with Adhesive Sealant) Correction In most cases, this type of air loss can be corrected by following the procedure below. Important DO NOT replace a wheel for slow air loss unless you have evaluated and/or tried to repair the wheel with the procedure below. Notice The repair is no longer advised or applicable for chromed aluminum wheels. 1. Remove the wheel and tire assembly for diagnosis. Refer to Tire and Wheel Removal and Installation in SI. 2. After a water dunk tank leak test, if you determine the source of the air leak to be around the bead seat of the wheel, dismount the tire to examine the bead seat. Shown below is a typical area of bead seat corrosion.Typical Location of Bead Seat Corrosion Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3730 Important Other forms of slow air leaks are possible. If the body of the tire, valve stem and wheel flange show no signs of air seepage, refer to Corporate Bulletin Number 05-03-10-003D for additional information on possible wheel porosity issues. 3. Bead seat corrosion is identified by what appears like blistering of the wheel finish, causing a rough or uneven surface that is difficult for the tire to maintain a proper seal on. Below is a close-up photo of bead seat corrosion on an aluminum wheel that was sufficient to cause slow air loss. Close-Up of Bead Seat Corrosion 4. If corrosion is found on the wheel bead seat, measure the affected area as shown below. - For vehicles with 32,186 km (20,000 mi) or less, the total allowable combined linear area of repairable corrosion is 100 mm (4 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. - For vehicles that have exceeded 32,186 km (20,000 mi), the total allowable combined linear area of repairable corrosion is 200 mm (8 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. 5. In order to correct the wheel leak, use a clean-up (fine cut) sanding disc or biscuit to remove the corrosion and any flaking paint. You should remove the corrosion back far enough until you reach material that is stable and firmly bonded to the wheel. Try to taper the edge of any flaking paint as best you can in order to avoid sharp edges that may increase the chance of a leak reoccurring. The photo below shows an acceptable repaired surface. Notice Corrosion that extends up the lip of the wheel, where after the clean-up process it would be visible with the tire mounted, is only acceptable on the inboard flange. The inboard flange is not visible with the wheel assembly in the mounted position. If any loose coatings or corrosion extend to the visible surfaces on the FACE of the wheel, that wheel must be replaced. Important Remove ONLY the material required to eliminate the corrosion from the bead seating surface. DO NOT remove excessive amounts of material. ALWAYS keep the sealing surface as smooth and level as possible. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3731 Acceptably Prepared (Cleaned-Up) Wheel Surface 6. Once the corrosion has been eliminated, you should coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealant or equivalent. Commercially available bead sealants are black rubber-like coatings that will permanently fill and seal the resurfaced bead seat. At 21°C (70°F) ambient temperature, this sealant will set-up sufficiently for tire mounting in about 10 minutes.Coated and Sealed Bead Seat 7. Remount the tire and install the repaired wheel and tire assembly. Refer to Tire and Wheel Removal and Installation in SI. Parts Information Patch Brand Bead Sealer is available from Myers Tires at 1-800-998-9897 or on the web at www.myerstiresupply.com. The one-quart size can of sealer will repair about 20 wheels. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use: Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3732 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Wheels: > 04-03-10-012B > Feb > 08 > Wheels - Chrome Wheel Brake Dust Accumulation/Pitting Wheels: All Technical Service Bulletins Wheels - Chrome Wheel Brake Dust Accumulation/Pitting Bulletin No.: 04-03-10-012B Date: February 01, 2008 INFORMATION Subject: Pitting and Brake Dust on Chrome wheels Models: 2008 and Prior GM Passenger Cars and Trucks (including Saturn) 2008 and Prior HUMMER H2, H3 2005-2008 Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 04-03-10-012A (Section 03 - Suspension). Analysis of Returned Wheels Chrome wheels returned under the New Vehicle Limited Warranty for pitting concerns have recently been evaluated. This condition is usually most severe in the vent (or window) area of the front wheels. This "pitting" may actually be brake dust that has been allowed to accumulate on the wheel. The longer this accumulation builds up, the more difficult it is to remove. Cleaning the Wheels In all cases, the returned wheels could be cleaned to their original condition using GM Vehicle Care Cleaner Wax, P/N 12377966 (in Canada, P/N 10952905). When using this product, you should confine your treatment to the areas of the wheel that show evidence of the brake dust build-up. This product is only for use on chromed steel or chromed aluminum wheels. Parts Information Warranty Information Wheel replacement for this condition is NOT applicable under the terms of the New Vehicle Limited Warranty. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion Wheels: All Technical Service Bulletins Wheels - Chrome Wheel Staining/Pitting/Corrosion INFORMATION Bulletin No.: 00-03-10-002F Date: April 21, 2011 Subject: Chemical Staining, Pitting, Corrosion and/or Spotted Appearance of Chromed Aluminum Wheels Models: 2012 and Prior GM Cars and Trucks Supercede: This bulletin is being revised to update model years, suggest additional restorative products and add additional corrosion information. Please discard Corporate Bulletin Number 00-03-10-002E (Section 03 - Suspension). Important You may give a copy of this bulletin to the customer. What is Chemical Staining of Chrome Wheels? Figure 1 Chemical staining in most cases results from acid based cleaners (refer to Figure 1 for an example). These stains are frequently milky, black, or greenish in appearance. They result from using cleaning solutions that contain acids on chrome wheels. Soap and water is usually sufficient to clean wheels. If the customer insists on using a wheel cleaner they should only use one that specifically states that it is safe for chromed wheels and does not contain anything in the following list. (Dealers should also survey any products they use during prep or normal cleaning of stock units for these chemicals.) - Ammonium Bifluoride (fluoride source for dissolution of chrome) - Hydrofluoric Acid (directly dissolves chrome) - Hydrochloric Acid (directly dissolves chrome) - Sodium Dodecylbenzenesulfonic Acid - Sulfamic Acid - Phosphoric Acid - Hydroxyacetic Acid Notice Many wheel cleaner instructions advise to take care to avoid contact with painted surfaces. Most customers think of painted surfaces as the fenders, quarter panels and other exterior sheet metal. Many vehicles have painted brake calipers. Acidic wheel cleaners may craze, crack, or discolor the paint on the brake calipers. Damage from wheel cleaners is not covered under the vehicle new car warranty. Soap and water applied with a soft brush is usually all that is required to clean the calipers. Whenever any wheel cleaner is used, it must be THOROUGHLY rinsed off of the wheel with clean, clear water. Special care must be taken to rinse under the hub cap, balance weights, wheel nuts, lug nut caps, between the wheel cladding and off the back side of the wheel. Wheels returned to the Warranty Parts Center (WPC) that exhibit damage from wheel cleaners most often have the damage around and under the wheel weight where the cleaner was incompletely flushed away. Notice Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3742 Do not use cleaning solutions that contain hydrofluoric, oxalic and most other acids on chrome wheels (or any wheels). If the customer is unsure of the chemical make-up of a particular wheel cleaner, it should be avoided. For wheels showing signs of milky staining from acidic cleaners, refer to Customer Assistance and Instructions below. Warranty of Stained Chrome Wheels Stained wheels are not warrantable. Most acid based cleaners will permanently stain chrome wheels. Follow-up with dealers has confirmed that such cleaners were used on wheels that were returned to the Warranty Parts Center (WPC). Any stained wheels received by the WPC will be charged back to the dealership. To assist the customer, refer to Customer Assistance and Instructions below. Pitting or Spotted Appearance of Chrome Wheels Figure 2 A second type or staining or finish disturbance may result from road chemicals, such as calcium chloride used for dust control of unpaved roads. The staining will look like small pitting (refer to Figure 2). This staining will usually be on the leading edges of each wheel spoke, but may be uniformly distributed. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Important Road chemicals, such as calcium chloride used for dust control of unpaved roads, can also stain chrome wheels. The staining will look like small pitting. This staining will usually be on the leading edges of each wheel spoke. This is explained by the vehicle traveling in the forward direction while being splashed by the road chemical. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Warranty of Pitted or Spotted Chrome Wheels Wheels returned with pitting or spotting as a result of road chemicals may be replaced one time. Damage resulting from contact with these applied road chemicals is corrosive to the wheels finish and may cause damage if the wheels are not kept clean. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean if they are operating the vehicle in an area that applies calcium chloride or other dust controlling chemicals! "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). "Stardust" Corrosion of Chrome Wheels Figure 3 A third type of finish disturbance results from prolonged exposure to brake dust and resultant penetration of brake dust through the chrome. As brakes are applied hot particles of brake material are thrown off and tend to be forced through the leading edge of the wheel spoke windows by airflow. These Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3743 hot particles embed themselves in the chrome layer and create a small pit. If the material is allowed to sit on the wheel while it is exposed to moisture or salt, it will corrode the wheel beneath the chrome leaving a pit or small blister in the chrome. Heavy brake dust build-up should be removed from wheels by using GM Chrome Cleaner and Polish, P/N 1050173 (in Canada use 10953013). For moderate cleaning, light brake dust build-up or water spots use GM Swirl Remover Polish, P/N 12377965 (in Canada, use Meguiars Plast-X(TM) Clear Plastic Cleaner and Polish #G12310C**). After cleaning, the wheel should be waxed using GM Cleaner Wax, P/N 12377966 (in Canada, use Meguiars Cleaner Wax #M0616C**), which will help protect the wheel from brake dust and reduce adhesion of any brake dust that gets on the wheel surface. For general maintenance cleaning, PEEK Metal Polish† may be used. It will clean and shine the chrome and leave behind a wax coating that may help protect the finish. Warranty of Stardust Corroded Chrome Wheels Wheels returned with pitting or spotting as a result of neglect and brake dust build-up may be replaced one time. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean and free of prolonged exposure to brake dust build-up. "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). Customer Assistance and Instructions GM has looked for ways customers may improve the appearance of wheels damaged by acidic cleaners. The following product and procedure has been found to dramatically improve the appearance of stained wheels. For wheels that have milky stains caused by acidic cleaners try the following: Notice THE 3M CHROME AND METAL POLISH REQUIRED FOR THIS PROCEDURE IS AN EXTREMELY AGGRESSIVE POLISH/CLEANER. THE WHEELS MUST BE CLEANED BEFORE APPLICATION TO AVOID SCRATCHING THE WHEEL SURFACE. THIS PRODUCT WILL REDUCE THE THICKNESS OF THE CHROME PLATING ON THE WHEEL AND IF USED INCORRECTLY OR EXCESSIVELY MAY REMOVE THE CHROME PLATING ALL TOGETHER, EXPOSING A LESS BRIGHT AND BRASSY COLORED SUB-LAYER. FOLLOW INSTRUCTIONS EXACTLY. 1. Wash the wheels with vigorously with soap and water. This step will clean and may reduce wheel staining. Flood all areas of the wheel with water to rinse. 2. Dry the wheels completely. Notice Begin with a small section of the wheel and with light pressure buff off polish and examine results. ONLY apply and rub with sufficient force and time to remove enough staining that you are satisfied with the results. Some wheels may be stained to the extent that you may only achieve a 50% improvement while others may be able to be restored to the original lustre. IN ALL CASES, only apply until the results are satisfactory. 3. Apply 3M Chrome and Metal Polish #39527* with a clean terry cloth towel. As you apply the polish, the staining will be diminished. 4. When dry, buff off the polish with a clean portion of the towel. 5. Repeat application of the 3M Chrome and Metal Polish until satisfied with the results. If continued applications fail to improve the appearance further discontinue use. This procedure will improve the appearance of the wheels and may, with repeated applications, restore the finish dramatically. For wheels that exhibit spotting from road chemicals the above procedure may marginally improve the condition but will not restore the finish or remove the pitting. In this type of staining the wheel finish has actually been removed in spots and no manner of cleaning will restore the finish. †*We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3744 *This product is currently available from 3M. To obtain information for your local retail location please call 3M at 1-888-364-3577. **This product is currently available from Meguiars (Canada). To obtain information for your local retail location please call Meguiars at 1-800-347-5700 or at www.meguiarscanada.com. ^ This product is currently available from Tri-Peek International. To obtain information for your local retail location please call Tri-Peek at 1-877-615-4272 or at www.tripeek.com. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 99-08-51-007E > Mar > 11 > Wheels/Tires - Refinishing Aluminum Wheels Wheels: All Technical Service Bulletins Wheels/Tires - Refinishing Aluminum Wheels INFORMATION Bulletin No.: 99-08-51-007E Date: March 17, 2011 Subject: Refinishing Aluminum Wheels Models: 2012 and Prior GM Passenger Cars and Trucks Supercede: This bulletin is being revised to add additional model years. Please discard Corporate Bulletin Number 99-08-51-007D (Section 08 - Body and Accessories). This bulletin updates General Motor's position on refinishing aluminum wheels. GM does not endorse any repairs that involve welding, bending, straightening or re-machining. Only cosmetic refinishing of the wheel's coatings, using recommended procedures, is allowed. Evaluating Damage In evaluating damage, it is the GM Dealer's responsibility to inspect the wheel for corrosion, scrapes, gouges, etc. The Dealer must insure that such damage is not deeper than what can be sanded or polished off. The wheel must be inspected for cracks. If cracks are found, discard the wheel. Any wheels with bent rim flanges must not be repaired or refinished. Wheels that have been refinished by an outside company must be returned to the same vehicle. The Dealer must record the wheel ID stamp or the cast date on the wheel in order to assure this requirement. Refer to Refinisher's Responsibility - Outside Company later in this bulletin. Aluminum Wheel Refinishing Recommendations - Chrome-plated aluminum wheels Re-plating these wheels is not recommended. - Polished aluminum wheels These wheels have a polyester or acrylic clearcoat on them. If the clearcoat is damaged, refinishing is possible. However, the required refinishing process cannot be performed in the dealer environment. Refer to Refinisher's Responsibility - Outside Company later in this bulletin. - Painted aluminum wheels These wheels are painted using a primer, color coat, and clearcoat procedure. If the paint is damaged, refinishing is possible. As with polished wheels, all original coatings must be removed first. Media blasting is recommended. Refer to GM Aluminum Refinishing Bulletin #53-17-03A for the re-painting of this type of wheel. - Bright, machined aluminum wheels These wheels have a polyester or acrylic clearcoat on them. In some cases, the recessed "pocket" areas of the wheel may be painted. Surface refinishing is possible. The wheel must be totally stripped by media blasting or other suitable means. The wheel should be resurfaced by using a sanding process rather than a machining process. This allows the least amount of material to be removed. Important Do not use any re-machining process that removes aluminum. This could affect the dimensions and function of the wheel. Painting is an option to re-clearcoating polished and bright machined aluminum wheels. Paint will better mask any surface imperfections and is somewhat more durable than clearcoat alone. GM recommends using Corsican SILVER WAEQ9283 for a fine "aluminum-like" look or Sparkle SILVER WA9967 for a very bright look. As an option, the body color may also be used. When using any of the painting options, it is recommended that all four wheels be refinished in order to maintain color uniformity. Refer to GM Aluminum Refinishing Bulletin #53-17-03A for specific procedures and product recommendations. Refinisher's Responsibility - Outside Company Important Some outside companies are offering wheel refinishing services. Such refinished wheels will be permanently marked by the refinisher and are warranted by the refinisher. Any process that re-machines or otherwise re-manufactures the wheel should not be used. A refinisher's responsibility includes inspecting for cracks using the Zyglo system or the equivalent. Any cracked wheels must not be refinished. No welding, hammering or reforming of any kind is allowed. The wheel ID must be recorded and follow the wheel throughout the process in order to assure that the same wheel is returned. A plastic media blast may be used for clean up of the wheel. Hand and/or lathe sanding of the machined surface and the wheel window is allowed. Material removal, though, must be kept to a minimum. Re-machining of the wheel is not allowed. Paint and/or clear coat must not be present on the following surfaces: the nut chamfers, the wheel mounting surfaces and the wheel pilot hole. The refinisher must permanently ID stamp the wheel and warrant the painted/clearcoated surfaces for a minimum of one year or the remainder of the new vehicle warranty, whichever is Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 99-08-51-007E > Mar > 11 > Wheels/Tires - Refinishing Aluminum Wheels > Page 3749 longer. Important Whenever a wheel is refinished, the mounting surface and the wheel nut contact surfaces must not be painted or clearcoated. Coating these surfaces could affect the wheel nut torque. When re-mounting a tire on an aluminum wheel, coated balance weights must be used in order to reduce the chance of future cosmetic damage. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions Wheels: All Technical Service Bulletins Wheels - Changing Procedures/Precautions INFORMATION Bulletin No.: 06-03-10-010A Date: June 09, 2010 Subject: Information on Proper Wheel Changing Procedures and Cautions Models: 2011 and Prior GM Passenger Cars and Trucks 2010 and Prior HUMMER Models 2005-2009 Saab 9-7X 2005-2009 Saturn Vehicles Attention: Complete wheel changing instructions for each vehicle line can be found under Tire and Wheel Removal and Installation in Service Information (SI). This bulletin is intended to quickly review and reinforce simple but vital procedures to reduce the possibility of achieving low torque during wheel installation. Always refer to SI for wheel lug nut torque specifications and complete jacking instructions for safe wheel changing. Supercede: This bulletin is being revised to include the 2011 model year and update the available special tool list. Please discard Corporate Bulletin Number 06-03-10-010 (Section 03 Suspension). Frequency of Wheel Changes - Marketplace Driven Just a few years ago, the increasing longevity of tires along with greater resistance to punctures had greatly reduced the number of times wheels were removed to basically required tire rotation intervals. Today with the booming business in accessory wheels/special application tires (such as winter tires), consumers are having tire/wheel assemblies removed - replaced - or installed more than ever. With this increased activity, it opens up more of a chance for error on the part of the technician. This bulletin will review a few of the common concerns and mistakes to make yourself aware of. Proper Servicing Starts With the Right Tools The following tools have been made available to assist in proper wheel and tire removal and installation. - J 41013 Rotor Resurfacing Kit (or equivalent) - J 42450-A Wheel Hub Resurfacing Kit (or equivalent) Corroded Surfaces One area of concern is corrosion on the mating surfaces of the wheel to the hub on the vehicle. Excessive corrosion, dirt, rust or debris built up on these surfaces can mimic a properly tightened wheel in the service stall. Once the vehicle is driven, the debris may loosen, grind up or be washed away from water splash. This action may result in clearance at the mating surface of the wheel and an under-torqued condition. Caution Before installing a wheel, remove any buildup on the wheel mounting surface and brake drum or brake disc mounting surface. Installing wheels with poor metal-to-metal contact at the mounting surfaces can cause wheel nuts to loosen. This may cause a wheel to come off when the vehicle is moving, possibly resulting in a loss of control or personal injury. Whenever you remove the tire/wheel assemblies, you must inspect the mating surfaces. If corrosion is found, you should remove the debris with a die grinder equipped with a fine sanding pad, wire brush or cleaning disc. Just remove enough material to assure a clean, smooth mating surface. The J 41013 (or equivalent) can be used to clean the following surfaces: - The hub mounting surface - The brake rotor mounting surface - The wheel mounting surface Use the J 42450-A (or equivalent) to clean around the base of the studs and the hub. Lubricants, Grease and Fluids Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3754 Some customers may use penetrating oils, grease or other lubricants on wheel studs to aid in removal or installation. Always use a suitable cleaner/solvent to remove these lubricants prior to installing the wheel and tire assemblies. Lubricants left on the wheel studs may cause improper readings of wheel nut torque. Always install wheels to clean, dry wheel studs ONLY. Notice Lubricants left on the wheel studs or vertical mounting surfaces between the wheel and the rotor or drum may cause the wheel to work itself loose after the vehicle is driven. Always install wheels to clean, dry wheel studs and surfaces ONLY. Beginning with 2011 model year vehicles, put a light coating of grease, GM P/N 1051344 (in Canada, P/N 9930370), on the inner surface of the wheel pilot hole to prevent wheel seizure to the axle or bearing hub. Wheel Stud and Lug Nut Damage Always inspect the wheel studs and lug nuts for signs of damage from crossthreading or abuse. You should never have to force wheel nuts down the stud. Lug nuts that are damaged may not retain properly, yet give the impression of fully tightening. Always inspect and replace any component suspected of damage. Tip Always start wheel nuts by hand! Be certain that all wheel nut threads have been engaged BEFORE tightening the nut. Important If the vehicle has directional tread tires, verify the directional arrow on the outboard side of the tire is pointing in the direction of forward rotation. Wheel Nut Tightening and Torque Improper wheel nut tightening can lead to brake pulsation and rotor damage. In order to avoid additional brake repairs, evenly tighten the wheel nuts to the proper torque specification as shown for each vehicle in SI. Always observe the proper wheel nut tightening sequence as shown below in order to avoid trapping the wheel on the wheel stud threads or clamping the wheel slightly off center resulting in vibration. The Most Important Service You Provide While the above information is well known, and wheel removal so common, technicians run the risk of becoming complacent on this very important Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3755 service operation. A simple distraction or time constraint that rushes the job may result in personal injury if the greatest of care is not exercised. Make it a habit to double check your work and to always side with caution when installing wheels. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wheels: > 04-03-10-012B > Feb > 08 > Wheels - Chrome Wheel Brake Dust Accumulation/Pitting Wheels: All Technical Service Bulletins Wheels - Chrome Wheel Brake Dust Accumulation/Pitting Bulletin No.: 04-03-10-012B Date: February 01, 2008 INFORMATION Subject: Pitting and Brake Dust on Chrome wheels Models: 2008 and Prior GM Passenger Cars and Trucks (including Saturn) 2008 and Prior HUMMER H2, H3 2005-2008 Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 04-03-10-012A (Section 03 - Suspension). Analysis of Returned Wheels Chrome wheels returned under the New Vehicle Limited Warranty for pitting concerns have recently been evaluated. This condition is usually most severe in the vent (or window) area of the front wheels. This "pitting" may actually be brake dust that has been allowed to accumulate on the wheel. The longer this accumulation builds up, the more difficult it is to remove. Cleaning the Wheels In all cases, the returned wheels could be cleaned to their original condition using GM Vehicle Care Cleaner Wax, P/N 12377966 (in Canada, P/N 10952905). When using this product, you should confine your treatment to the areas of the wheel that show evidence of the brake dust build-up. This product is only for use on chromed steel or chromed aluminum wheels. Parts Information Warranty Information Wheel replacement for this condition is NOT applicable under the terms of the New Vehicle Limited Warranty. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Technical Service Bulletins > Page 3760 Wheels: Description and Operation Replacement Wheels Description Replace the wheel if any of the following conditions exist: ^ The wheel exhibits excessive runout. ^ The wheel is bent. ^ The wheel is cracked. ^ The wheel is severely rusted. ^ The wheel is severely corroded. ^ The wheel leaks air. Important: Air leaks caused by porosity on aluminum wheels are repairable. Caution: If you are replacing the wheel(s), the wheel stud(s), the wheel nut(s) or the wheel bolt(s), install only new GM original equipment parts. Installation of used parts or non-GM original equipment parts may cause the wheel to loosen, loss of tire air pressure, poor vehicle handling and loss of vehicle control resulting in personal injury. Notice: The use of non-GM original equipment wheels may cause: ^ Damage to the wheel bearing, the wheel fasteners and the wheel ^ Tire damage caused by the modified clearance to the adjacent vehicle components ^ Adverse vehicle steering stability caused by the modified scrub radius ^ Damage to the vehicle caused by the modified ground clearance ^ Speedometer and odometer inaccuracy Replace the wheel, the wheel studs and the wheel/nuts, or the wheel bolts if applicable, if any of the following conditions exist: ^ The wheel has elongated bolt holes. ^ The wheel/nuts, or bolts if applicable, loosen repeatedly. Steel wheel identification is stamped into the wheel near the valve stem. Aluminum wheel identification is cast into the inboard side of the wheel. Steel Wheel Repair Description Notice: Do not heat wheels in an attempt to soften them for straightening or repair damage from striking curbs, etc. Do not weld wheels. The alloy used in these wheels is heat-treated and uncontrolled heating from welding affects the properties of the material. Notice: The use of tubes in tubeless tires is not a recommended repair due to the fact that speed ratings are greatly reduced. You can repair porosity in aluminum wheels. If leaks are found in a steel wheel, replace the wheel with a wheel of original equipment quality. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Service and Repair > Wheel Mounting Surface Check Wheels: Service and Repair Wheel Mounting Surface Check Wheel Mounting Surface Check Replace any wheels that are bent or dented, or have excessive lateral or radial runout. Wheels with runout greater than specified may cause objectionable vibrations. Wheel Mounting Surface Check 1. Use a straight edge 203 - 229 mm (8 - 9 inch) long. Place the straight edge on the wheel inboard mounting surface. Try to rock the straightedge up and down within the mounting surface. 2. Repeat this procedure on at least 3-4 different positions on the inboard mounting surface. ^ The outer ring of the mounting surface normally is raised above everything inside the mounting surface. ^ The mounting surface will be raised above the outer ring if the wheel mounting surface has been bent on a tire changer. ^ If you can rock the straight edge, the mounting surface is bent and you must replace the wheel. 3. Inspect the mounting wheel/nut holes for damage caused from over-torquing the wheel/nuts. Inspect for collapsed wheel/nut bosses. Inspect for cracked wheel bosses. 4. Replace the wheel if the wheel is bent. Notice: The use of non-GM original equipment wheels may cause: ^ Damage to the wheel bearing, the wheel fasteners and the wheel ^ Tire damage caused by the modified clearance to the adjacent vehicle components ^ Adverse vehicle steering stability caused by the modified scrub radius ^ Damage to the vehicle caused by the modified ground clearance Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Service and Repair > Wheel Mounting Surface Check > Page 3763 ^ Speedometer and odometer inaccuracy Important: ^ Replacement wheels must be equivalent to the original equipment wheels in the following ways: The load capacity - The wheel diameter - The rim width - The wheel offset - The mounting configuration ^ A wheel of the incorrect size or type may affect the following conditions: ^ Wheel and hub-bearing life Brake cooling - Speedometer/odometer calibration - Vehicle ground clearance - Tire clearance to the body and the chassis 5. Replace the wheel if the wheel/nut boss area is cracked. Identify steel wheels with a 2 or 3-letter code stamped into the rim near the valve stem. Aluminum wheels have the code, the part number, and the manufacturer identification cast into the back side of the wheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Service and Repair > Wheel Mounting Surface Check > Page 3764 Wheels: Service and Repair Aluminum Wheel Porosity Repair Aluminum Wheel Porosity Repair 1. Raise and support the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel. 3. Inflate the tire to the manufactures specified pressure as stated on the tire. 4. Submerge the tire/wheel into a water bath in order to locate the leak. 5. Inscribe a mark on the wheel in order to indicate the leak areas. 6. Inscribe a mark on the tire at the valve stem in order to Indicate the orientation of the tire to the wheel. 7. Remove the tire from the wheel. 8. Use number 80 grit sandpaper to scuff the inside of the rim surface at the leak area. Important: Do not damage the exterior surface of the wheel. 9. Use general purpose cleaner such as 3M(R), P/N 08984 or equivalent, to clean the leak area. 10. Apply 3 mm (0.12 inch) thick layer of adhesive/sealant, GM P/N 1052366 or equivalent, to the leak area. 11. Allow for the adhesive/sealant to dry. 12. Align the inscribed mark on the tire with the valve stem on the wheel. 13. Install the tire to the wheel. 14. Inflate the tire to the manufactures specified pressure as stated on the tire. 15. Submerge the tire/wheel into a water bath in order ensure the leak is sealed. 16. Balance the tire and wheel. Refer to Tire and Wheel Assembly Balancing - Off-Vehicle. 17. Install the tire and wheel. 18. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheels > Component Information > Service and Repair > Wheel Mounting Surface Check > Page 3765 Wheels: Service and Repair Aluminum Wheel Refinishing Aluminum Wheel Refinishing Finish Damage Evaluation Procedure 1. Inspect the wheels for damage from uncoated wheel balance weights or from automatic car wash facilities. Important: ^ If the wheels are chrome-plated, do not re-plate or refinish the wheels. ^ If the wheels are polished aluminum, do not refinish the wheels in the dealer environment. Utilize a refinisher that meets manufacturer guidelines. 2. Inspect the wheels for the following conditions: ^ Corrosion ^ Scrapes ^ Gouges 3. Verify the damage is not deeper than what sanding can remove. 4. Inspect the wheels for cracks. If a wheel has cracks, discard the wheel. 5. Inspect the wheels for bent rim flanges. If a rim flange is bent, discard the wheel. Refinishing Procedure 1. Remove the tire and wheel assembly from the vehicle. Caution: To avoid serious personal injury when applying any two part component paint system, follow the specific precautions provided by the paint manufacturer. Failure to follow these precautions may cause lung irritation and allergic respiratory reaction. 2. Remove the balance weights from the wheel. 3. Remove the tire from the wheel. 4. Use a suitable cleaner in order to remove the following contaminants from the wheel: ^ Lubricants ^ Wax ^ Dirt 5. Use plastic media blasting in order to remove the paint from the wheel. Important: ^ Do not re-machine the wheel. ^ Do not use chemicals in order to strip the paint from the wheel. 6. If the wheel had a machined aluminum finish, spin the wheel and use sand paper in order to restore the circular machined appearance. 7. Mask the wheel mounting surface and the wheel nut contact surface. Important: The wheel mounting surface and the wheel nut contact surface must remain free of paint. 8. Follow the paint manufacturer's instructions for painting the wheel. 9. Unmask the wheel. 10. Install a new valve stem. 11. Install the tire to the wheel. Important: Use new coated balance weights in order to balance the wheel. 12. Use a suitable cleaner in order to remove the following contaminants from the wheel mounting surface: ^ Corrosion ^ Overspray ^ Dirt 13. Install the tire and wheel assembly to the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Bearing > Component Information > Testing and Inspection Step 1 - Step 7 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Bearing > Component Information > Testing and Inspection > Page 3769 Wheel Bearing: Service and Repair Wheel Hub, Bearing, and Seal Replacement (RWD) Removal Procedure 1. Raise and support the vehicle. 2. Remove the tire and wheel. 3. Remove the brake rotor. 4. Remove the ABS sensor mounting bolt from the wheel hub and bearing. 5. Remove the ABS sensor from the wheel hub and bearing. 6. Remove the wheel hub and bearing to the steering knuckle mounting bolts. 7. Remove the wheel hub and bearing from the steering knuckle. 8. Remove the splash shield from the steering knuckle. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Bearing > Component Information > Testing and Inspection > Page 3770 1. Install the splash shield to the steering knuckle. Align the splash shield to the steering knuckle threaded holes. 2. Install the wheel hub and bearing to the steering knuckle. Align the threaded holes. 3. Install the wheel hub and bearing to the steering knuckle mounting bolts. Tighten the wheel hub and bearing mounting bolts to 105 Nm (77 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Install the ABS sensor to the wheel hub and bearing. 5. Install the ABS sensor mounting bolt to the wheel hub and bearing. Tighten the ABS sensor to the wheel hub and bearing mounting bolt to 18 Nm (13 ft. lbs.). 6. Install the brake rotor. 7. Install the tire and wheel. 8. Lower the Vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Hub > Axle Nut > Component Information > Specifications Axle Nut: Specifications Drive Axle Nut Tighten the drive axle nut to ........................................................................................................................................................... 140 Nm (103 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Fastener > Component Information > Specifications Wheel Fastener: Specifications Wheel Lug Nut Front Wheel Stud .......................................................................................................................................... ................................................. 130 Nm (95 lb. ft.) Rear Wheel Nut ............................................................................................................................................ ............................................. 140 Nm (103 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Fastener > Component Information > Specifications > Page 3778 Wheel Nut Torque Sequence Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Fastener > Component Information > Specifications > Page 3779 Wheel Fastener: Description and Operation Metric Wheel Nuts and Bolts Description Metric wheel/nuts and bolts are identified in the following way: ^ The wheel/nut has the word Metric stamped on the face. ^ The letter M is stamped on the end of the wheel bolt. The thread sizes of metric wheel/nuts and the bolts are indicated by the following example: M12 x 1.5. ^ M = Metric ^ 12 = Diameter in millimeters ^ 1.5 = Millimeters gap per thread Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Fastener > Component Information > Service and Repair > Front Suspension Wheel Fastener: Service and Repair Front Suspension Wheel Stud Replacement Tools Required ^ J43631 Ball Joint Remover Removal Procedure 1. Raise and support the vehicle. 2. Remove the tire and the wheel. 3. Remove the rotor. 4. Remove the wheel stud bolt using J43631. Important: Do not hammer on a wheel stud. Installation Procedure 1. Install the wheel stud to the wheel hub and bearing. 2. Install 4 washers and the nut to the wheel stud. Tighten the wheel stud nut to 130 Nm (95 ft. lbs.), drawing in the wheel stud. Notice: Refer to Fastener Notice in Service Precautions. 3. Remove the nut and the washers. 4. Install the rotor. 5. Install the tire and the wheel. 6. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Fastener > Component Information > Service and Repair > Front Suspension > Page 3782 Wheel Fastener: Service and Repair Rear Suspension Wheel Stud Replacement Tools Required ^ J43631 Ball Joint Separator Removal Procedure 1. Raise and support the vehicle. 2. Remove the tire and wheel. 3. Remove the rotor. 4. Remove the wheel stud from the axle flange using the J43631. Installation Procedure 1. Install the stud into the axle flange. 2. Install the 4 washers and the lug nut to the stud. 3. Tighten the lug nut in order to draw the stud into the flange until the stud fully seats. 4. Remove the lug nut and the washers. 5. Install the rotor. 6. Install the tire and wheel. 7. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Fastener > Component Information > Service and Repair > Front Suspension > Page 3783 Wheel Fastener: Service and Repair Front Wheel Stud Replacement Tools Required ^ J43631 Ball Joint Remover Removal Procedure 1. Raise and support the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and the wheel. 3. Remove the rotor. 4. Remove the wheel stud bolt using J43631. Important: Do not hammer on a wheel stud. Installation Procedure 1. Install the wheel stud to the wheel hub and bearing. 2. Install 4 washers and the nut to the wheel stud. Tighten the wheel stud nut to 130 Nm (95 ft. lbs.), drawing in the wheel stud. Notice: Refer to Fastener in Service Precautions. 3. Remove the nut and the washers. 4. Install the rotor. 5. Install the tire and the wheel. 6. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Wheels and Tires > Wheel Fastener > Component Information > Service and Repair > Front Suspension > Page 3784 Wheel Fastener: Service and Repair Rear Wheel Stud Replacement Tools Required ^ J43631 Ball Joint Separator Removal Procedure 1. Raise and support the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel. 3. Remove the rotor. 4. Remove the wheel stud from the axle flange using the J43631. Installation Procedure 1. Install the stud into the axle flange. 2. Install the 4 washers and the lug nut to the stud. 3. Tighten the lug nut in order to draw the stud into the flange until the stud fully seats. 4. Remove the lug nut and the washers. 5. Install the rotor. 6. Install the tire and wheel. 7. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Jump Starting > System Information > Technical Service Bulletins > Electrical - Proper Jump Starting Procedure Jump Starting: Technical Service Bulletins Electrical - Proper Jump Starting Procedure Bulletin No.: 04-06-03-005A Date: May 17, 2006 INFORMATION Subject: Proper Connection Information to Avoid Blown 125 Amp Fuse and Various Interior Electrical System Conditions When Jump Starting Vehicle Models: 2004-2007 Buick Rainier 2002-2007 Chevrolet TrailBlazer, TrailBlazer EXT 2002-2007 GMC Envoy, Envoy XL 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-06-03-005 (Section 06 - Engine/Propulsion System). It has been found that some dealers may be using the IP battery positive stud at the underhood fuse block to jump start the vehicle. This bulletin is being issued to inform dealers that investigation has indicated the 125 amp mega fuse (no. 48) located in the engine compartment fuse block may be blown resulting in various electrical system conditions due to using this improper connection. To properly jump start the vehicle, you must always use the following connections. For the positive connection, use the battery terminal. For the negative connection, use the remote terminal located on the front engine lift bracket (marked "GND"). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Jump Starting > System Information > Technical Service Bulletins > Electrical - Proper Jump Starting Procedure > Page 3789 Do NOT attach the positive jumper cable to the stud located under the engine compartment fuse block cover. Doing so may blow the fuse resulting in various interior electrical system conditions. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Jump Starting > System Information > Technical Service Bulletins > Page 3790 Jump Starting: Service Precautions CAUTION: Batteries produce explosive gases. Batteries contain corrosive acid. Batteries supply levels of electrical current high enough to cause burns. Therefore, in order to reduce the risk of personal injury while working near a battery, observe the following guidelines: - Always shield your eyes. - Avoid leaning over the battery whenever possible. - Do not expose the battery to open flames or sparks. - Do not allow battery acid to contact the eyes or the skin. Flush any contacted areas with water immediately and thoroughly. Get medical help. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Jump Starting > System Information > Technical Service Bulletins > Page 3791 Jump Starting: Service and Repair JUMP STARTING IN CASE OF EMERGENCY CAUTION: Batteries produce explosive gases. Batteries contain corrosive acid. Batteries supply levels of electrical current high enough to cause burns. Therefore, in order to reduce the risk of personal injury while working near a battery, observe the following guidelines: - Always shield your eyes. - Avoid leaning over the battery whenever possible. - Do not expose the battery to open flames or sparks. - Do not allow battery acid to contact the eyes or the skin. Flush any contacted areas with water immediately and thoroughly. Get medical help. NOTE: This vehicle has a 12 volt, negative ground electrical system. Make sure the vehicle or equipment being used to jump start the engine is also 12 volt, negative ground. Use of any other type of system will damage the vehicle's electrical components. This vehicle has a 12-volt positive, negative ground electrical system. Do not try to jump start a vehicle, if you are unsure of the other vehicle's positive voltage or ground position. The booster battery and the discharged battery should be treated carefully when using jumper cables. 1. Position the vehicle with the booster battery so that the jumper cables will comfortably reach the battery of the other vehicle. - Do not let the 2 vehicles touch. - Make sure that the jumper cables do not have loose clamps or missing insulation. 2. Perform the following steps on both vehicles: 1. Place the automatic transmission in PARK. 2. Block the wheels. 3. Set the parking brake. 4. Turn off all electrical loads that are not needed. Leave the hazard flashers ON. 5. Turn OFF the ignition switch. 3. Attach the end of one jumper cable to the positive terminal of the discharged battery. IMPORTANT: Some vehicles have a battery remote positive stud. ALWAYS use the battery remote positive stud in order to give or to receive a jump start. Consult the vehicle's owner's manual for proper connections. 4. Attach the other end of the first cable to the positive terminal of the booster battery. 5. Attach one end of the remaining jumper cable to the negative terminal of the booster battery. 6. Make the final connection of the negative jumper cable to the block or suitable bracket connected directly to the block, away from the battery. NOTE: Do not connect the negative charger lead to the housings of other vehicle electrical accessories or equipment. The action of the battery charger may damage such equipment. 7. Start the engine of the vehicle that is providing the jump start and turn off all electrical accessories. Raise the engine RPM to approximately 1,500 RPM. 8. Crank the engine of the vehicle with the weak battery.If the engine does not crank or cranks too slowly, perform the following steps: 0. Turn the ignition OFF. 1. Allow the booster vehicle engine to run at approximately 1,500 RPM for 5 minutes. 2. Attempt to start the engine of the vehicle with the discharged battery. 9. Reverse the steps exactly when removing the jumper cables. The negative battery cable must first be disconnected from the engine that was jump started. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Vehicle Lifting > Component Information > Service Precautions Vehicle Lifting: Service Precautions CAUTION: - To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed. - To avoid any vehicle damage, serious personal injury or death, always use the jackstands to support the vehicle when lifting the vehicle with a jack. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Vehicle Lifting > Component Information > Service and Repair > General Information Vehicle Lifting: Service and Repair General Information LIFTING AND JACKING THE VEHICLE CAUTION: - To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed. - To avoid any vehicle damage, serious personal injury or death, always use the jackstands to support the vehicle when lifting the vehicle with a jack. NOTE: Perform the following steps before beginning any vehicle lifting or jacking procedure: - Remove or secure all of the vehicle's contents in order to avoid any shifting or any movement that may occur during the vehicle lifting or jacking procedure. - The lifting equipment or the jacking equipment weight rating must meet or exceed the weight of the vehicle and any vehicle contents. - The lifting equipment or the jacking equipment must meet the operational standards of the lifting equipment or jacking equipment's manufacturer. - Perform the vehicle lifting or jacking procedure on a clean, hard, dry, level surface. - Perform the vehicle lifting or jacking procedure only at the identified lift points. DO NOT allow the lifting equipment or jacking equipment to contact any other vehicle components. Failure to perform the previous steps could result in damage to the lifting equipment or the jacking equipment, the vehicle, and/or the vehicle's contents. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Vehicle Lifting > Component Information > Service and Repair > General Information > Page 3797 Vehicle Lifting: Service and Repair Vehicle Jacking VEHICLE JACKING - Park the vehicle on a clean, hard, level surface before jacking the vehicle. - Any time you lift the vehicle on one end, chock the wheels at the opposite end. - Use jack stands in order to provide support. - When supporting the vehicle using jack stands, place the jack stands under the side rails or the axle. - When lifting under the rear differential, do not allow the jack pad to contact the rear stabilizer bar or mounting hardware. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Maintenance > Vehicle Lifting > Component Information > Service and Repair > General Information > Page 3798 Vehicle Lifting: Service and Repair Vehicle Lifting VEHICLE LIFTING - Ensure that the lifting equipment meets weight requirements and is in good working order. Always follow the lift manufacturer's instructions. - You may lift and support the front of the vehicle at the front suspension near the wheel assemblies. Ensure that the arms of the front cradle are extended as close to the steering knuckle as possible. - Ensure that the vehicle is centered on the hoist before attempting to lift. - When using a suspension-contact hoist, ensure that the rear cradle has adequate clearance for the rear stabilizer bar. - When lifting or jacking a vehicle, be certain that the lift pads do not contact the exhaust system, brake pipes, cables, HVAC lines, wiring harnesses, fuel lines, or underbody. Such contact may result in damage or unsatisfactory vehicle performance. - When using a frame-contact hoist, only place the pads on flat surfaces. Do not place pads within 50 mm (2 in) of any radius. - Before lifting the vehicle, verify that the vehicle loads are secure and equally distributed. - When major components are removed from the vehicle when supported on a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and secure the vehicle frame to the hoist pads nearest the component to be removed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Compression Check > System Information > Specifications Compression Check: Specifications No cylinder should read less than ............................................................................................................................................................ 690 kPa (100 psi). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Compression Check > System Information > Specifications > Page 3804 Compression Check: Testing and Inspection Engine Compression Test 1. Charge the battery if the battery is not fully charged. 2. Disable the ignition system. 3. Disable the fuel injection system. 4. Remove all spark plugs. 5. Turn the ignition to the ON position. 6. Depress the accelerator pedal to position the throttle plate wide open. 7. Start with the compression gage at zero and crank the engine through 4 compression strokes, 4 puffs. 8. Measure the compression for each cylinder. Record the readings. 9. If a cylinder has low compression, inject approximately 15 ml (1 tablespoon) of engine oil into the combustion chamber through the spark plug hole. Measure the compression again and record the reading. 10. The minimum compression in any 1 cylinder should not be less than 70 percent of the highest cylinder. No cylinder should read less than 690 kPa (100 psi). For example, if the highest pressure in any 1 cylinder is 1,035 kPa (150 psi), the lowest allowable pressure for any other cylinder would be 725 kPa (105 psi). (1,035 x 70% = 725) (150 x 70% = 105). ^ Normal - Compression builds up quickly and evenly to the specified compression for each cylinder. ^ Piston Rings Leaking - Compression is low on the first stroke. Compression builds up with the following strokes, but does not reach normal. Compression improves considerably when you add oil. ^ Valves Leaking - Compression is low on the first stroke. Compression usually does not build up on the following strokes. Compression does not improve much when you add oil. ^ If 2 adjacent cylinders have lower than normal compression, and injecting oil into the cylinders does not increase the compression, the cause may be a head gasket leaking between the cylinders. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Camshaft Bearing > Component Information > Specifications Camshaft Bearing: Specifications Camshaft Retainer Bolts - Hex Head Bolts .............................................................................................................................................. 25 Nm (18 ft. lbs.) Camshaft Retainer Bolts - TORX(r) Head Bolts ...................................................................................................................................... 15 Nm (11 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Camshaft Gear/Sprocket > Component Information > Specifications Camshaft Gear/Sprocket: Specifications Camshaft Sprocket Bolts ..................................................................................................................... ..................................................... 25 Nm (18 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Camshaft, Engine > Component Information > Service and Repair Camshaft: Service and Repair Camshaft Replacement Removal Procedure 1. Remove the condenser. 2. Remove the valve lifters from both cylinder heads. 3. Remove the camshaft sensor bolt and sensor. 4. Rotate the crankshaft until the timing marks on the crankshaft and camshaft sprockets are aligned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Camshaft, Engine > Component Information > Service and Repair > Page 3815 5. Remove the camshaft sprocket bolts (206). Notice: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves. 6. Remove the camshaft sprocket (205) and reposition the timing chain (208). 7. Remove the camshaft retainer bolts and retainer. Notice: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Camshaft, Engine > Component Information > Service and Repair > Page 3816 bearings. 8. Remove the camshaft. 1. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 inch) bolts to the bolt holes in the front of the camshaft. 2. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block. 3. Remove the three bolts from the camshaft. 9. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning and Inspection. Installation Procedure Important: If camshaft replacement is required, the valve lifters must also be replaced. 1. Lubricate the camshaft journals and the bearings with clean engine oil. Notice: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings. 2. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 inch) bolts to the bolt holes in the front of the camshaft. 3. Using the bolts as a handle, carefully install the camshaft into the engine block. 4. Remove the three bolts from the front of the camshaft. Important: Install the retainer plate with the sealing gasket facing the engine block. The gasket surface on the engine block should be clean and free of dirt and/or debris. Notice: Refer to Fastener Notice in Service Precautions. 5. Install the camshaft retainer and bolts. ^ Tighten the bolts to 25 Nm (18 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Camshaft, Engine > Component Information > Service and Repair > Page 3817 Important: ^ Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole. ^ The sprocket teeth and timing chain must mesh. ^ The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly. Locate the camshaft sprocket alignment mark in the 6 o'clock position. 6. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks. 7. Install the camshaft sprocket (205) and the timing chain (208). 8. Install the camshaft sprocket bolts (206). ^ Tighten the bolts to 35 Nm (26 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Camshaft, Engine > Component Information > Service and Repair > Page 3818 9. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused. 10. Lubricate the O-ring seal with clean engine oil. 11. Install the camshaft sensor and bolt. ^ Tighten the bolt to 25 Nm (18 ft. lbs.). 12. Install the valve lifters. 13. Install the condenser. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Lifter / Lash Adjuster, Valve > Component Information > Service and Repair Lifter / Lash Adjuster: Service and Repair Valve Lifter Replacement ^ Tools Required J 3049-A Valve Lifter Remover Removal Procedure 1. Remove the cylinder head and gasket. 2. Remove the valve lifter. 3. Clean and inspect the valve lifters. Refer to Valve Lifters and Guides Cleaning and Inspection. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Lifter / Lash Adjuster, Valve > Component Information > Service and Repair > Page 3822 1. Install the valve lifter. 2. Install the cylinder head and gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Push Rod > Component Information > Service and Repair Push Rod: Service and Repair Valve Rocker Arm and Push Rod Replacement Removal Procedure 1. Remove the valve rocker arm cover. Important: Place the valve rocker arms, push rods, and pivot support, in a rack so that the can be installed in the same location from which they were removed. 2. Remove the valve rocker arm bolts. 3. Remove the valve rocker arms. 4. Remove the valve rocker arm pivot support. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Push Rod > Component Information > Service and Repair > Page 3826 5. Remove the pushrods. 6. Clean and inspect the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rods Cleaning and Inspection. Installation Procedure Important: When reusing the valve train components, always install the components to the original location and position. 1. The valve lash is net build, no valve adjustment is required. Lubricate the valve rocker arms and pushrods with clean engine oil. 2. Lubricate the flange of the valve rocker arm bolts with clean engine oil. 3. Lubricate the flange or washer surface of the bolt that will contact the valve rocker arm. 4. Install the valve rocker arm pivot support. Important: Make sure that the pushrods seat properly to the valve lifter sockets. 5. Install the pushrods. Important: Verify that the pushrods seat properly to the ends of the rocker arms. DO NOT tighten the rocker arm bolts at this time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Push Rod > Component Information > Service and Repair > Page 3827 6. Install the rocker arms and bolts. 7. Rotate the crankshaft until the number one piston is at top dead center (TDC) of the compression stroke.In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position.The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3. Cylinders 1, 3, 5 and 7 are the left bank.Cylinder 2, 4, 6 and 8 are the right bank. Notice: Refer to Fastener Notice in Service Precautions. 8. With the engine in the number one firing position, tighten the following valve rocker arm bolts: ^ Tighten cylinders 1, 2, 7 and 8 exhaust valve rocker arm bolts to 30 Nm (22 ft. lbs.). ^ Tighten cylinders 1, 3, 4 and 5 intake valve rocker arm bolts to 30 Nm (22 ft. lbs.). 9. Rotate the crankshaft 360 degrees. 10. Tighten the following valve rocker arm bolts: ^ Tighten cylinders 3, 4, 5 and 6 exhaust valve rocker arm bolts to 30 Nm (22 ft. lbs.). ^ Tighten cylinders 2, 6, 7 and 8 intake valve rocker arm bolts to 30 Nm (22 ft. lbs.). 11. Install the valve rocker arm cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Rocker Arm Assembly > Component Information > Service and Repair Rocker Arm Assembly: Service and Repair Valve Rocker Arm and Push Rod Replacement Removal Procedure 1. Remove the valve rocker arm cover. Important: Place the valve rocker arms, push rods, and pivot support, in a rack so that the can be installed in the same location from which they were removed. 2. Remove the valve rocker arm bolts. 3. Remove the valve rocker arms. 4. Remove the valve rocker arm pivot support. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Rocker Arm Assembly > Component Information > Service and Repair > Page 3831 5. Remove the pushrods. 6. Clean and inspect the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rods Cleaning and Inspection. Installation Procedure Important: When reusing the valve train components, always install the components to the original location and position. 1. The valve lash is net build, no valve adjustment is required. Lubricate the valve rocker arms and pushrods with clean engine oil. 2. Lubricate the flange of the valve rocker arm bolts with clean engine oil. 3. Lubricate the flange or washer surface of the bolt that will contact the valve rocker arm. 4. Install the valve rocker arm pivot support. Important: Make sure that the pushrods seat properly to the valve lifter sockets. 5. Install the pushrods. Important: Verify that the pushrods seat properly to the ends of the rocker arms. DO NOT tighten the rocker arm bolts at this time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Camshaft, Lifters and Push Rods > Rocker Arm Assembly > Component Information > Service and Repair > Page 3832 6. Install the rocker arms and bolts. 7. Rotate the crankshaft until the number one piston is at top dead center (TDC) of the compression stroke.In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position.The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3. Cylinders 1, 3, 5 and 7 are the left bank.Cylinder 2, 4, 6 and 8 are the right bank. Notice: Refer to Fastener Notice in Service Precautions. 8. With the engine in the number one firing position, tighten the following valve rocker arm bolts: ^ Tighten cylinders 1, 2, 7 and 8 exhaust valve rocker arm bolts to 30 Nm (22 ft. lbs.). ^ Tighten cylinders 1, 3, 4 and 5 intake valve rocker arm bolts to 30 Nm (22 ft. lbs.). 9. Rotate the crankshaft 360 degrees. 10. Tighten the following valve rocker arm bolts: ^ Tighten cylinders 3, 4, 5 and 6 exhaust valve rocker arm bolts to 30 Nm (22 ft. lbs.). ^ Tighten cylinders 2, 6, 7 and 8 intake valve rocker arm bolts to 30 Nm (22 ft. lbs.). 11. Install the valve rocker arm cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Connecting Rod Bearing > Component Information > Specifications Connecting Rod Bearing: Specifications Connecting Rod Bearing Clearance - Production .................................................................................................... 0.023?0.065 mm (0.0009?0.0025 inch) Connecting Rod Bearing Clearance - Service ............................................................................................................ 0.023-0.076 mm (0.0009-0.003 inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Connecting Rod, Engine > Component Information > Technical Service Bulletins > Engine - Revised Connecting Rod Bolt Torque Connecting Rod: Technical Service Bulletins Engine - Revised Connecting Rod Bolt Torque Bulletin No.: 07-06-01-002 Date: March 05, 2007 INFORMATION Subject: Information on Revised Connecting Rod Bolt Torque for Small Block GEN III and GEN IV Vortec(TM) V8 Engines Models A new connecting rod bolt torque specification was introduced to the GEN III and GEN IV Vortec(TM) small block V8 engines. The connecting rod bolts should continue to be tightened using two passes. The second pass value has been increased from 75 degrees to 85 degrees. Install the connecting rod bolts and tighten. Refer to Piston, Connecting Rod, and Bearing Installation in SI. Tighten Tighten the connecting rod bolts a first pass to 20 N.m (15 lb ft). Tighten the connecting rod bolts a final pass to 85 degrees using the J 45059 Angle Meter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Connecting Rod, Engine > Component Information > Technical Service Bulletins > Engine - Revised Connecting Rod Bolt Torque > Page 3841 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Connecting Rod, Engine > Component Information > Technical Service Bulletins > Page 3842 Connecting Rod: Specifications The contents of this article have been updated by TSB # 07-06-01-002 dated 3/5/2007. Connecting Rod Bolts - First Pass ............................................................................................................................................................ 20 Nm (15 ft. lbs.) Connecting Rod Bolts - Final Pass ........................................................................ ................................................................................................ 85 degrees Connecting Rod Bore Diameter - Bearing End ........................................................................................................ 56.505-56.525 mm (2.224-2.225 inch) Connecting Rod Bore Out-of-Round - Bearing End Production .......................................................................... 0.004-0.008 mm (0.00015-0.0003 inch) Connecting Rod Bore Out-of-Round - Bearing End - Service ............................................................................... 0.004-0.008 mm (0.00015-0.0003 inch) Connecting Rod Side Clearance ..................................................................................................................................... 0.11-0.51 mm (0.00433-0.02 inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Crankshaft Main Bearing > Component Information > Specifications Crankshaft Main Bearing: Specifications Crankshaft Bearing Cap M10 Bolts - First Pass in Sequence ................................................................................................................... 20 Nm (15 ft. lbs.) Crankshaft Bearing Cap M10 Bolts - Final Pass in Sequence ............................................................................................................................... 80 degrees Crankshaft Bearing Cap M10 Studs - First Pass in Sequence ................................................................................................................... 20 Nm (15 ft. lbs.) Crankshaft Bearing Cap M10 Studs - Final Pass in Sequence .............................................................................................................................. 51 degrees Crankshaft Bearing Cap M8 Bolts ............................................................................................................................................................ 25 Nm (18 ft. lbs.) Crankshaft Main Bearing Clearance - Production ...................................................................................................... 0.02-0.052 mm (0.0008-0.0021 inch) Crankshaft Main Bearing Clearance - Service ........................................................................................................... 0.02-0.065 mm (0.0008-0.0025 inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Crankshaft, Engine > Component Information > Specifications Crankshaft: Specifications Connecting Rod Journal Diameter - Production ................................................................................................... 53.318-53.338 mm (2.0991-2.0999 inch) Connecting Rod Journal Diameter - Service ................................................................................................................................. 53.308 mm (2.0987 inch) Connecting Rod Journal Out-of-Round - Production ...................................................................................................................... 0.005 mm (0.0002 inch) Connecting Rod Journal Out-of-Round - Service ............................................................................................................................. 0.01 mm (0.0004 inch) Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Production ...................................................................... 0.005 mm (0.0002 inch) Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Service ............................................................................ 0.02 mm (0.00078 inch) Crankshaft End Play ....................................................................................................................................................... 0.04-0.2 mm (0.0015-0.0078 inch) Crankshaft Main Journal Diameter - Production ..................................................................................................... 64.992?65.008 mm (2.558-2.559 inch) Crankshaft Main Journal Diameter - Service .................................................................................................................................. 64.992 mm (2.558 inch) Crankshaft Main Journal Out-of-Round - Production ................................................................................................................. 0.003 mm (0.000118 inch) Crankshaft Main Journal Out-of-Round - Service .......................................................................................................................... 0.008 mm (0.0003 inch) Crankshaft Main Journal Taper - Production .................................................................................................................................... 0.01 mm (0.0004 inch) Crankshaft Main Journal Taper - Service ....................................................................................................................................... 0.02 mm (0.00078 inch) Crankshaft Rear Flange Runout .......................................................................................................................................................... 0.05 mm (0.002 inch) Crankshaft Reluctor Ring Runout - Measured 1.0 mm (0.04 in) Below Tooth Diameter ..................................................................... 0.7 mm (0.028 inch) Crankshaft Thrust Surface - Production ..................................................................................................................... 26.14-26.22 mm (1.029-1.0315 inch) Crankshaft Thrust Surface - Service ............................................................................................................................................... 26.22 mm (1.0315 inch) Crankshaft Thrust Surface Runout .................................................................................................................................................... 0.025 mm (0.001 inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Engine Block Heater: Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3857 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3858 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3859 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > Customer Interest: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3860 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Engine Block Heater: All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3866 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3867 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3868 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 3869 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion Wheels: All Technical Service Bulletins Wheels - Chrome Wheel Staining/Pitting/Corrosion INFORMATION Bulletin No.: 00-03-10-002F Date: April 21, 2011 Subject: Chemical Staining, Pitting, Corrosion and/or Spotted Appearance of Chromed Aluminum Wheels Models: 2012 and Prior GM Cars and Trucks Supercede: This bulletin is being revised to update model years, suggest additional restorative products and add additional corrosion information. Please discard Corporate Bulletin Number 00-03-10-002E (Section 03 - Suspension). Important You may give a copy of this bulletin to the customer. What is Chemical Staining of Chrome Wheels? Figure 1 Chemical staining in most cases results from acid based cleaners (refer to Figure 1 for an example). These stains are frequently milky, black, or greenish in appearance. They result from using cleaning solutions that contain acids on chrome wheels. Soap and water is usually sufficient to clean wheels. If the customer insists on using a wheel cleaner they should only use one that specifically states that it is safe for chromed wheels and does not contain anything in the following list. (Dealers should also survey any products they use during prep or normal cleaning of stock units for these chemicals.) - Ammonium Bifluoride (fluoride source for dissolution of chrome) - Hydrofluoric Acid (directly dissolves chrome) - Hydrochloric Acid (directly dissolves chrome) - Sodium Dodecylbenzenesulfonic Acid - Sulfamic Acid - Phosphoric Acid - Hydroxyacetic Acid Notice Many wheel cleaner instructions advise to take care to avoid contact with painted surfaces. Most customers think of painted surfaces as the fenders, quarter panels and other exterior sheet metal. Many vehicles have painted brake calipers. Acidic wheel cleaners may craze, crack, or discolor the paint on the brake calipers. Damage from wheel cleaners is not covered under the vehicle new car warranty. Soap and water applied with a soft brush is usually all that is required to clean the calipers. Whenever any wheel cleaner is used, it must be THOROUGHLY rinsed off of the wheel with clean, clear water. Special care must be taken to rinse under the hub cap, balance weights, wheel nuts, lug nut caps, between the wheel cladding and off the back side of the wheel. Wheels returned to the Warranty Parts Center (WPC) that exhibit damage from wheel cleaners most often have the damage around and under the wheel weight where the cleaner was incompletely flushed away. Notice Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3875 Do not use cleaning solutions that contain hydrofluoric, oxalic and most other acids on chrome wheels (or any wheels). If the customer is unsure of the chemical make-up of a particular wheel cleaner, it should be avoided. For wheels showing signs of milky staining from acidic cleaners, refer to Customer Assistance and Instructions below. Warranty of Stained Chrome Wheels Stained wheels are not warrantable. Most acid based cleaners will permanently stain chrome wheels. Follow-up with dealers has confirmed that such cleaners were used on wheels that were returned to the Warranty Parts Center (WPC). Any stained wheels received by the WPC will be charged back to the dealership. To assist the customer, refer to Customer Assistance and Instructions below. Pitting or Spotted Appearance of Chrome Wheels Figure 2 A second type or staining or finish disturbance may result from road chemicals, such as calcium chloride used for dust control of unpaved roads. The staining will look like small pitting (refer to Figure 2). This staining will usually be on the leading edges of each wheel spoke, but may be uniformly distributed. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Important Road chemicals, such as calcium chloride used for dust control of unpaved roads, can also stain chrome wheels. The staining will look like small pitting. This staining will usually be on the leading edges of each wheel spoke. This is explained by the vehicle traveling in the forward direction while being splashed by the road chemical. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Warranty of Pitted or Spotted Chrome Wheels Wheels returned with pitting or spotting as a result of road chemicals may be replaced one time. Damage resulting from contact with these applied road chemicals is corrosive to the wheels finish and may cause damage if the wheels are not kept clean. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean if they are operating the vehicle in an area that applies calcium chloride or other dust controlling chemicals! "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). "Stardust" Corrosion of Chrome Wheels Figure 3 A third type of finish disturbance results from prolonged exposure to brake dust and resultant penetration of brake dust through the chrome. As brakes are applied hot particles of brake material are thrown off and tend to be forced through the leading edge of the wheel spoke windows by airflow. These Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3876 hot particles embed themselves in the chrome layer and create a small pit. If the material is allowed to sit on the wheel while it is exposed to moisture or salt, it will corrode the wheel beneath the chrome leaving a pit or small blister in the chrome. Heavy brake dust build-up should be removed from wheels by using GM Chrome Cleaner and Polish, P/N 1050173 (in Canada use 10953013). For moderate cleaning, light brake dust build-up or water spots use GM Swirl Remover Polish, P/N 12377965 (in Canada, use Meguiars Plast-X(TM) Clear Plastic Cleaner and Polish #G12310C**). After cleaning, the wheel should be waxed using GM Cleaner Wax, P/N 12377966 (in Canada, use Meguiars Cleaner Wax #M0616C**), which will help protect the wheel from brake dust and reduce adhesion of any brake dust that gets on the wheel surface. For general maintenance cleaning, PEEK Metal Polish† may be used. It will clean and shine the chrome and leave behind a wax coating that may help protect the finish. Warranty of Stardust Corroded Chrome Wheels Wheels returned with pitting or spotting as a result of neglect and brake dust build-up may be replaced one time. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean and free of prolonged exposure to brake dust build-up. "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). Customer Assistance and Instructions GM has looked for ways customers may improve the appearance of wheels damaged by acidic cleaners. The following product and procedure has been found to dramatically improve the appearance of stained wheels. For wheels that have milky stains caused by acidic cleaners try the following: Notice THE 3M CHROME AND METAL POLISH REQUIRED FOR THIS PROCEDURE IS AN EXTREMELY AGGRESSIVE POLISH/CLEANER. THE WHEELS MUST BE CLEANED BEFORE APPLICATION TO AVOID SCRATCHING THE WHEEL SURFACE. THIS PRODUCT WILL REDUCE THE THICKNESS OF THE CHROME PLATING ON THE WHEEL AND IF USED INCORRECTLY OR EXCESSIVELY MAY REMOVE THE CHROME PLATING ALL TOGETHER, EXPOSING A LESS BRIGHT AND BRASSY COLORED SUB-LAYER. FOLLOW INSTRUCTIONS EXACTLY. 1. Wash the wheels with vigorously with soap and water. This step will clean and may reduce wheel staining. Flood all areas of the wheel with water to rinse. 2. Dry the wheels completely. Notice Begin with a small section of the wheel and with light pressure buff off polish and examine results. ONLY apply and rub with sufficient force and time to remove enough staining that you are satisfied with the results. Some wheels may be stained to the extent that you may only achieve a 50% improvement while others may be able to be restored to the original lustre. IN ALL CASES, only apply until the results are satisfactory. 3. Apply 3M Chrome and Metal Polish #39527* with a clean terry cloth towel. As you apply the polish, the staining will be diminished. 4. When dry, buff off the polish with a clean portion of the towel. 5. Repeat application of the 3M Chrome and Metal Polish until satisfied with the results. If continued applications fail to improve the appearance further discontinue use. This procedure will improve the appearance of the wheels and may, with repeated applications, restore the finish dramatically. For wheels that exhibit spotting from road chemicals the above procedure may marginally improve the condition but will not restore the finish or remove the pitting. In this type of staining the wheel finish has actually been removed in spots and no manner of cleaning will restore the finish. †*We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3877 *This product is currently available from 3M. To obtain information for your local retail location please call 3M at 1-888-364-3577. **This product is currently available from Meguiars (Canada). To obtain information for your local retail location please call Meguiars at 1-800-347-5700 or at www.meguiarscanada.com. ^ This product is currently available from Tri-Peek International. To obtain information for your local retail location please call Tri-Peek at 1-877-615-4272 or at www.tripeek.com. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 99-08-51-007E > Mar > 11 > Wheels/Tires - Refinishing Aluminum Wheels Wheels: All Technical Service Bulletins Wheels/Tires - Refinishing Aluminum Wheels INFORMATION Bulletin No.: 99-08-51-007E Date: March 17, 2011 Subject: Refinishing Aluminum Wheels Models: 2012 and Prior GM Passenger Cars and Trucks Supercede: This bulletin is being revised to add additional model years. Please discard Corporate Bulletin Number 99-08-51-007D (Section 08 - Body and Accessories). This bulletin updates General Motor's position on refinishing aluminum wheels. GM does not endorse any repairs that involve welding, bending, straightening or re-machining. Only cosmetic refinishing of the wheel's coatings, using recommended procedures, is allowed. Evaluating Damage In evaluating damage, it is the GM Dealer's responsibility to inspect the wheel for corrosion, scrapes, gouges, etc. The Dealer must insure that such damage is not deeper than what can be sanded or polished off. The wheel must be inspected for cracks. If cracks are found, discard the wheel. Any wheels with bent rim flanges must not be repaired or refinished. Wheels that have been refinished by an outside company must be returned to the same vehicle. The Dealer must record the wheel ID stamp or the cast date on the wheel in order to assure this requirement. Refer to Refinisher's Responsibility - Outside Company later in this bulletin. Aluminum Wheel Refinishing Recommendations - Chrome-plated aluminum wheels Re-plating these wheels is not recommended. - Polished aluminum wheels These wheels have a polyester or acrylic clearcoat on them. If the clearcoat is damaged, refinishing is possible. However, the required refinishing process cannot be performed in the dealer environment. Refer to Refinisher's Responsibility - Outside Company later in this bulletin. - Painted aluminum wheels These wheels are painted using a primer, color coat, and clearcoat procedure. If the paint is damaged, refinishing is possible. As with polished wheels, all original coatings must be removed first. Media blasting is recommended. Refer to GM Aluminum Refinishing Bulletin #53-17-03A for the re-painting of this type of wheel. - Bright, machined aluminum wheels These wheels have a polyester or acrylic clearcoat on them. In some cases, the recessed "pocket" areas of the wheel may be painted. Surface refinishing is possible. The wheel must be totally stripped by media blasting or other suitable means. The wheel should be resurfaced by using a sanding process rather than a machining process. This allows the least amount of material to be removed. Important Do not use any re-machining process that removes aluminum. This could affect the dimensions and function of the wheel. Painting is an option to re-clearcoating polished and bright machined aluminum wheels. Paint will better mask any surface imperfections and is somewhat more durable than clearcoat alone. GM recommends using Corsican SILVER WAEQ9283 for a fine "aluminum-like" look or Sparkle SILVER WA9967 for a very bright look. As an option, the body color may also be used. When using any of the painting options, it is recommended that all four wheels be refinished in order to maintain color uniformity. Refer to GM Aluminum Refinishing Bulletin #53-17-03A for specific procedures and product recommendations. Refinisher's Responsibility - Outside Company Important Some outside companies are offering wheel refinishing services. Such refinished wheels will be permanently marked by the refinisher and are warranted by the refinisher. Any process that re-machines or otherwise re-manufactures the wheel should not be used. A refinisher's responsibility includes inspecting for cracks using the Zyglo system or the equivalent. Any cracked wheels must not be refinished. No welding, hammering or reforming of any kind is allowed. The wheel ID must be recorded and follow the wheel throughout the process in order to assure that the same wheel is returned. A plastic media blast may be used for clean up of the wheel. Hand and/or lathe sanding of the machined surface and the wheel window is allowed. Material removal, though, must be kept to a minimum. Re-machining of the wheel is not allowed. Paint and/or clear coat must not be present on the following surfaces: the nut chamfers, the wheel mounting surfaces and the wheel pilot hole. The refinisher must permanently ID stamp the wheel and warrant the painted/clearcoated surfaces for a minimum of one year or the remainder of the new vehicle warranty, whichever is Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 99-08-51-007E > Mar > 11 > Wheels/Tires - Refinishing Aluminum Wheels > Page 3882 longer. Important Whenever a wheel is refinished, the mounting surface and the wheel nut contact surfaces must not be painted or clearcoated. Coating these surfaces could affect the wheel nut torque. When re-mounting a tire on an aluminum wheel, coated balance weights must be used in order to reduce the chance of future cosmetic damage. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions Wheels: All Technical Service Bulletins Wheels - Changing Procedures/Precautions INFORMATION Bulletin No.: 06-03-10-010A Date: June 09, 2010 Subject: Information on Proper Wheel Changing Procedures and Cautions Models: 2011 and Prior GM Passenger Cars and Trucks 2010 and Prior HUMMER Models 2005-2009 Saab 9-7X 2005-2009 Saturn Vehicles Attention: Complete wheel changing instructions for each vehicle line can be found under Tire and Wheel Removal and Installation in Service Information (SI). This bulletin is intended to quickly review and reinforce simple but vital procedures to reduce the possibility of achieving low torque during wheel installation. Always refer to SI for wheel lug nut torque specifications and complete jacking instructions for safe wheel changing. Supercede: This bulletin is being revised to include the 2011 model year and update the available special tool list. Please discard Corporate Bulletin Number 06-03-10-010 (Section 03 Suspension). Frequency of Wheel Changes - Marketplace Driven Just a few years ago, the increasing longevity of tires along with greater resistance to punctures had greatly reduced the number of times wheels were removed to basically required tire rotation intervals. Today with the booming business in accessory wheels/special application tires (such as winter tires), consumers are having tire/wheel assemblies removed - replaced - or installed more than ever. With this increased activity, it opens up more of a chance for error on the part of the technician. This bulletin will review a few of the common concerns and mistakes to make yourself aware of. Proper Servicing Starts With the Right Tools The following tools have been made available to assist in proper wheel and tire removal and installation. - J 41013 Rotor Resurfacing Kit (or equivalent) - J 42450-A Wheel Hub Resurfacing Kit (or equivalent) Corroded Surfaces One area of concern is corrosion on the mating surfaces of the wheel to the hub on the vehicle. Excessive corrosion, dirt, rust or debris built up on these surfaces can mimic a properly tightened wheel in the service stall. Once the vehicle is driven, the debris may loosen, grind up or be washed away from water splash. This action may result in clearance at the mating surface of the wheel and an under-torqued condition. Caution Before installing a wheel, remove any buildup on the wheel mounting surface and brake drum or brake disc mounting surface. Installing wheels with poor metal-to-metal contact at the mounting surfaces can cause wheel nuts to loosen. This may cause a wheel to come off when the vehicle is moving, possibly resulting in a loss of control or personal injury. Whenever you remove the tire/wheel assemblies, you must inspect the mating surfaces. If corrosion is found, you should remove the debris with a die grinder equipped with a fine sanding pad, wire brush or cleaning disc. Just remove enough material to assure a clean, smooth mating surface. The J 41013 (or equivalent) can be used to clean the following surfaces: - The hub mounting surface - The brake rotor mounting surface - The wheel mounting surface Use the J 42450-A (or equivalent) to clean around the base of the studs and the hub. Lubricants, Grease and Fluids Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3887 Some customers may use penetrating oils, grease or other lubricants on wheel studs to aid in removal or installation. Always use a suitable cleaner/solvent to remove these lubricants prior to installing the wheel and tire assemblies. Lubricants left on the wheel studs may cause improper readings of wheel nut torque. Always install wheels to clean, dry wheel studs ONLY. Notice Lubricants left on the wheel studs or vertical mounting surfaces between the wheel and the rotor or drum may cause the wheel to work itself loose after the vehicle is driven. Always install wheels to clean, dry wheel studs and surfaces ONLY. Beginning with 2011 model year vehicles, put a light coating of grease, GM P/N 1051344 (in Canada, P/N 9930370), on the inner surface of the wheel pilot hole to prevent wheel seizure to the axle or bearing hub. Wheel Stud and Lug Nut Damage Always inspect the wheel studs and lug nuts for signs of damage from crossthreading or abuse. You should never have to force wheel nuts down the stud. Lug nuts that are damaged may not retain properly, yet give the impression of fully tightening. Always inspect and replace any component suspected of damage. Tip Always start wheel nuts by hand! Be certain that all wheel nut threads have been engaged BEFORE tightening the nut. Important If the vehicle has directional tread tires, verify the directional arrow on the outboard side of the tire is pointing in the direction of forward rotation. Wheel Nut Tightening and Torque Improper wheel nut tightening can lead to brake pulsation and rotor damage. In order to avoid additional brake repairs, evenly tighten the wheel nuts to the proper torque specification as shown for each vehicle in SI. Always observe the proper wheel nut tightening sequence as shown below in order to avoid trapping the wheel on the wheel stud threads or clamping the wheel slightly off center resulting in vibration. The Most Important Service You Provide While the above information is well known, and wheel removal so common, technicians run the risk of becoming complacent on this very important Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3888 service operation. A simple distraction or time constraint that rushes the job may result in personal injury if the greatest of care is not exercised. Make it a habit to double check your work and to always side with caution when installing wheels. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) Wheels: All Technical Service Bulletins Wheels/Tires - Tire Radial Force Variation (RFV) INFORMATION Bulletin No.: 00-03-10-006F Date: May 04, 2010 Subject: Information on Tire Radial Force Variation (RFV) Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X 2000-2005 Saturn L Series 2003-2007 Saturn ION Supercede: This bulletin is being revised to considerably expand the available information on Radial Force Variation (RFV) and should be reviewed in whole. Please discard Corporate Bulletin Number 00-03-10-006E (Section 03 - Suspension). Important - Before measuring tires on equipment such as the Hunter GSP9700, the vehicle MUST be driven a minimum of 16 km (10 mi) to ensure removal of any flat-spotting. Refer to Corporate Bulletin Number 03-03-10-007E - Tire/Wheel Characteristics of GM Original Equipment Tires. - Equipment such as the Hunter GSP9700 MUST be calibrated prior to measuring tire/wheel assemblies for each vehicle. The purpose of this bulletin is to provide guidance to GM dealers when using tire force variation measurement equipment, such as the Hunter GSP9700. This type of equipment can be a valuable tool in diagnosing vehicle ride concerns. The most common ride concern involving tire radial force variation is highway speed shake on smooth roads. Tire related smooth road highway speed shake can be caused by three conditions: imbalance, out of round and tire force variation. These three conditions are not necessarily related. All three conditions must be addressed. Imbalance is normally addressed first, because it is the simpler of the three to correct. Off-vehicle, two plane dynamic wheel balancers are readily available and can accurately correct any imbalance. Balancer calibration and maintenance, proper attachment of the wheel to the balancer, and proper balance weights, are all factors required for a quality balance. However, a perfectly balanced tire/wheel assembly can still be "oval shaped" and cause a vibration. Before balancing, perform the following procedures. Tire and Wheel Diagnosis 1. Set the tire pressure to the placard values. 2. With the vehicle raised, ensure the wheels are centered on the hub by loosening all wheel nuts and hand-tightening all nuts first by hand while shaking the wheel, then torque to specifications using a torque wrench, NOT a torque stick. 3. Visually inspect the tires and the wheels. Inspect for evidence of the following conditions and correct as necessary: - Missing balance weights - Bent rim flange - Irregular tire wear - Incomplete bead seating - Tire irregularities (including pressure settings) - Mud/ice build-up in wheel - Stones in the tire tread - Remove any aftermarket wheels and/or tires and restore vehicle to original condition prior to diagnosing a smooth road shake condition. 4. Road test the vehicle using the Electronic Vibration Analyzer (EVA) essential tool. Drive for a sufficient distance on a known, smooth road surface to duplicate the condition. Determine if the vehicle is sensitive to brake apply. If the brakes are applied lightly and the pulsation felt in the steering wheel increases, refer to the Brakes section of the service manual that deals with brake-induced pulsation. If you can start to hear the vibration as a low boom noise (in addition to feeling it), but cannot see it, the vehicle likely has a first order (one pulse per propshaft revolution) driveline vibration. Driveline first order vibrations are high enough in frequency that most humans can start to hear them at highway speeds, but are too high to be able to be easily seen. These issues can be caused by driveline imbalance or misalignment. If the vehicle exhibits this low boom and the booming pulses in-and-out on a regular basis (like a throbbing), chances are good that the vehicle could have driveline vibration. This type Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3893 of vibration is normally felt more in the "seat of the pants" than the steering wheel. 5. Next, record the Hertz (Hz) reading as displayed by the EVA onto the tire data worksheet found at the end of this bulletin. This should be done after a tire break-in period of at least 16 km (10 mi) at 72 km/h (45 mph) or greater, in order to eliminate any possible tire flat-spotting. This reading confirms what the vehicle vibration frequency is prior to vehicle service and documents the amount of improvement occurring as the result of the various steps taken to repair. Completing the Steering Wheel Shake Worksheet below is required. A copy of the completed worksheet must be saved with the R.O. and a copy included with any parts returned to the Warranty Parts Center for analysis. A reading of 35 to 50 Hz typically indicates a first order propshaft vibration. If this is the situation, refer to Corporate Bulletin Number 08-07-30-044D. Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration and if this is the reading obtained, continue using this bulletin. If the tire 1st order vibration goes away and stays away during this evaluation, the cause is likely tire flat-spotting. Tire flat-spotting vibration may come and go at any speed over 72 km/h (45 mph) during the first 10 minutes of operation, if vibration continues after 10 minutes of driving at speeds greater than 72 km/h (45 mph), tire flat-spotting can be ruled out as the cause for vibration. 6. If flat-spotting is the cause, provide the explanation that this has occurred due to the vehicle being parked for long periods of time and that the nature of the tire is to take a set. Refer to Corporate Bulletin Number 03-03-10-007E: Information on Tire/Wheel Characteristics (Vibration, Balance, Shake, Flat Spotting) of GM Original Equipment Tires. 7. If the road test indicates a shake/vibration exists, check the imbalance of each tire/wheel assembly on a known, calibrated, off-car dynamic balancer.Make sure the mounting surface of the wheel and the surface of the balancer are absolutely clean and free of debris. Be sure to chose the proper cone/collet for the wheel, and always use the pilot bore for centering. Never center the wheel using the hub-cap bore since it is not a precision machined surface. If any assembly calls for more than 1/4 ounce on either rim flange, remove all balance weights and rebalance to as close to zero as possible. If you can see the vibration (along with feeling it) in the steering wheel (driving straight without your hands on the wheel), it is very likely to be a tire/wheel first order (one pulse per revolution) disturbance. First order disturbances can be caused by imbalance as well as non-uniformities in tires, wheels or hubs. This first order frequency is too low for a human to hear, but if the amplitude is high enough, it can be seen. If a vibration or shake still exists after balancing, any out of round conditions, of the wheel, and force variation conditions of the tire, must be addressed. Equipment such as the Hunter GSP9700 can address both (it is also a wheel balancer). Tire radial force vibration (RFV) can be defined as the amount of stiffness variation the tire will produce in one revolution under a constant load. Radial force variation is what the vehicle feels because the load (weight) of the vehicle is always on the tires. Although free runout of tires (not under load) is not always a good indicator of a smooth ride, it is critical that total tire/wheel assembly runout be within specification. Equipment such as the Hunter GSP9700 loads the tire, similar to on the vehicle, and measures radial force variation of the tire/wheel assembly. Note that the wheel is affecting the tire's RFV measurement at this point. To isolate the wheel, its runout must be measured. This can be easily done on the Hunter, without the need to set up dial indicators. If the wheel meets the runout specification, the tire's RFV can then be addressed. After measuring the tire/wheel assembly under load, and the wheel alone, the machine then calculates (predicts) the radial force variation of the tire. However, because this is a prediction that can include mounting inaccuracies, and the load wheel is much smaller in diameter than used in tire production, this type of service equipment should NOT be used to audit new tires. Rather, it should be used as a service diagnostic tool to minimize radial force variation of the tire/wheel assembly. Equipment such as the Hunter GSP9700 does an excellent job of measuring wheel runout, and of finding the low point of the wheel (for runout) and the high point of the tire (for radial force variation). This allows the tire to be matched mounted to the wheel for lowest tire/wheel assembly force variation. The machine will simplify this process into easy steps. The following assembly radial force variation numbers should be used as a guide: When measuring RFV and match mounting tires perform the following steps. Measuring Wheel Runout and Assembly Radial Force Variation Important The completed worksheet at the end of this bulletin must be attached to the hard copy of the repair order. - Measure radial force variation and radial runout. - If a road force/balancing machine is used, record the radial force variation (RFV) on the worksheet at the end of this bulletin. It may be of benefit to have the lowest RFV assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires onto the subject vehicle. - If a runout/balancing machine is used, record the radial runout of the tire/wheel assemblies on the worksheet at the end of this bulletin. If one or more of the tire/wheel assemblies are more than.040 in (1.02 mm), match mount the tire to the wheel to get below.040 in (1.02 mm). For sensitive customers, readings of 0.030 inch (0.76 mm) or less are preferable, it may also be of benefit to have the lowest runout assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3894 onto the subject vehicle. - After match mounting, the tire/wheel assembly must be rebalanced. If match mounting tires to in-spec wheels produces assembly values higher than these, tire replacement may be necessary. Replacing tires at lower values will probably mean good tires are being condemned. Because tires can sometimes become temporarily flat-spotted, which will affect force variation, it is important that the vehicle be driven at least 16 km (10 mi) prior to measuring. Tire pressure must also be adjusted to the usage pressure on the vehicle's tire placard prior to measuring. Most GM vehicles will tolerate radial force variation up to these levels. However, some vehicles are more sensitive, and may require lower levels. Also, there are other tire parameters that equipment such as the Hunter GSP9700 cannot measure that may be a factor. In such cases, TAC should be contacted for further instructions. Important - When mounting a GM wheel to a wheel balancer/force variation machine, always use the wheel's center pilot hole. This is the primary centering mechanism on all GM wheels; the bolt holes are secondary. Usually a back cone method to the machine should be used. For added accuracy and repeatability, a flange plate should be used to clamp the wheel onto the cone and machine. This system is offered by all balancer manufacturers in GM's dealer program. - Any type of service equipment that removes tread rubber by grinding, buffing or truing is NOT recommended, and may void the tire warranty. However, tires may have been ground by the tire company as part of their tire manufacturing process. This is a legitimate procedure. Steering Wheel Shake Worksheet When diagnosing vibration concerns, use the following worksheet in conjunction with the appropriate Vibration Analysis-Road testing procedure in the Vibration Correction sub-section in SI. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3895 Refer to the appropriate section of SI for specifications and repair procedures that are related to the vibration concern. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 05-03-10-003F > Apr > 10 > Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels Wheels: All Technical Service Bulletins Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels TECHNICAL Bulletin No.: 05-03-10-003F Date: April 27, 2010 Subject: Low Tire Pressure, Leaking Cast Aluminum Wheels (Repair with Adhesive Sealant) Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with Cast Aluminum Wheels Supercede: This bulletin is being revised to update the model years and the bulletin reference information. Please discard Corporate Bulletin Number 05-03-10-003E (Section 03 - Suspension). Condition Some customers may comment on a low tire pressure condition. Diagnosis of the low tire pressure condition indicates an air leak through the cast aluminum wheel. Cause Porosity in the cast aluminum wheel may be the cause. Notice This bulletin specifically addresses issues related to the wheel casting that may result in an air leak. For issues related to corrosion of the wheel in service, please refer to Corporate Bulletin Number 08-03-10-006C - Tire Slowly Goes Flat, Tire Air Loss, Low Tire Pressure Warning Light Illuminated, Aluminum Wheel Bead Seat Corrosion (Clean and Resurface Wheel Bead Seat). Correction 1. Remove the tire and wheel assembly from the vehicle. Refer to the appropriate service procedure in SI. 2. Locate the leaking area by inflating the tire to 276 kPa (40 psi) and dipping the tire/wheel assembly in a water bath, or use a spray bottle with soap and water to locate the specific leak location. Important - If the porosity leak is located in the bead area of the aluminum rim (where the tire meets the rim), the wheel should be replaced. - If two or more leaks are located on one wheel, the wheel should be replaced. 3. If air bubbles are observed, mark the location. - If the leak location is on the tire/rubber area, refer to Corporate Bulletin Number 04-03-10-001F Tire Puncture Repair Procedures for All Cars and Light Duty Trucks. - If the leak is located on the aluminum wheel area, continue with the next step. 4. Inscribe a mark on the tire at the valve stem in order to indicate the orientation of the tire to the wheel. 5. Dismount the tire from the wheel. Refer to Tire Mounting and Dismounting. 6. Remove the tire pressure sensor. Refer to Tire Pressure Sensor removal procedure in SI. 7. Scuff the INSIDE rim surface at the leak area with #80 grit paper and clean the area with general purpose cleaner, such as 3M(R) General Purpose Adhesive Cleaner, P/N 08984, or equivalent. 8. Apply a 3 mm (0.12 in) thick layer of Silicone - Adhesive/Sealant, P/N 12378478 (in Canada, use 88900041), or equivalent, to the leak area. 9. Allow for the adhesive/sealant to dry. Notice Caution must be used when mounting the tire so as not to damage the sealer. Damaging the repair area may result in an air leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 05-03-10-003F > Apr > 10 > Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels > Page 3900 10. Align the inscribed mark on the tire with the valve stem on the wheel. 11. Reinstall the Tire Pressure Sensor. Refer to Tire Pressure Sensor installation procedure in SI. 12. Mount the tire on the wheel. Refer to Tire Mounting and Dismounting. 13. Pressurize the tire to 276 kPa (40 psi) and inspect for leaks. 14. Adjust tire pressure to meet the placard specification. 15. Balance the tire/wheel assembly. Refer to Tire and Wheel Assembly Balancing - Off-Vehicle. 16. Install the tire and wheel assembly onto the vehicle. Refer to the appropriate service procedure in SI. Parts Information Warranty Information (excluding Saab U.S. Models) Important The Silicone - Adhesive/Sealant comes in a case quantity of six. ONLY charge warranty one tube of adhesive/sealant per wheel repair. For vehicles repaired under warranty, use: One leak repair per wheel. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON Wheels: All Technical Service Bulletins Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON TECHNICAL Bulletin No.: 08-03-10-006C Date: April 27, 2010 Subject: Tire Slowly Goes Flat, Tire Air Loss, Low Tire Pressure Warning Light Illuminated, Aluminum Wheel Bead Seat Corrosion (Clean and Resurface Wheel Bead Seat) Models: 2000-2011 GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2009 HUMMER H2 2006-2010 HUMMER H3 2005-2009 Saab 9-7X Supercede: This bulletin is being revised to update the model years. Please discard Corporate Bulletin Number 08-03-10-006B (Section 03 - Suspension). Condition Some customers may comment on a tire that slowly loses air pressure over a period of days or weeks. Cause Abrasive elements in the environment may intrude between the tire and wheel at the bead seat. There is always some relative motion between the tire and wheel (when the vehicle is driven) and this motion may cause the abrasive particles to wear the wheel and tire materials. As the wear continues, there may also be intrusion at the tire/wheel interface by corrosive media from the environment. Eventually a path for air develops and a 'slow' leak may ensue. This corrosion may appear on the inboard or outboard bead seating surface of the wheel. This corrosion will not be visible until the tire is dismounted from the wheel. Notice This bulletin specifically addresses issues related to wheel bead seat corrosion that may result in an air leak. For issues related to porosity of the wheel casting that may result in an air leak, please refer to Corporate Bulletin Number 05-03-10-006F - Low Tire Pressure, Leaking Cast Aluminum Wheels (Repair with Adhesive Sealant) Correction In most cases, this type of air loss can be corrected by following the procedure below. Important DO NOT replace a wheel for slow air loss unless you have evaluated and/or tried to repair the wheel with the procedure below. Notice The repair is no longer advised or applicable for chromed aluminum wheels. 1. Remove the wheel and tire assembly for diagnosis. Refer to Tire and Wheel Removal and Installation in SI. 2. After a water dunk tank leak test, if you determine the source of the air leak to be around the bead seat of the wheel, dismount the tire to examine the bead seat. Shown below is a typical area of bead seat corrosion.Typical Location of Bead Seat Corrosion Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3905 Important Other forms of slow air leaks are possible. If the body of the tire, valve stem and wheel flange show no signs of air seepage, refer to Corporate Bulletin Number 05-03-10-003D for additional information on possible wheel porosity issues. 3. Bead seat corrosion is identified by what appears like blistering of the wheel finish, causing a rough or uneven surface that is difficult for the tire to maintain a proper seal on. Below is a close-up photo of bead seat corrosion on an aluminum wheel that was sufficient to cause slow air loss. Close-Up of Bead Seat Corrosion 4. If corrosion is found on the wheel bead seat, measure the affected area as shown below. - For vehicles with 32,186 km (20,000 mi) or less, the total allowable combined linear area of repairable corrosion is 100 mm (4 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. - For vehicles that have exceeded 32,186 km (20,000 mi), the total allowable combined linear area of repairable corrosion is 200 mm (8 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. 5. In order to correct the wheel leak, use a clean-up (fine cut) sanding disc or biscuit to remove the corrosion and any flaking paint. You should remove the corrosion back far enough until you reach material that is stable and firmly bonded to the wheel. Try to taper the edge of any flaking paint as best you can in order to avoid sharp edges that may increase the chance of a leak reoccurring. The photo below shows an acceptable repaired surface. Notice Corrosion that extends up the lip of the wheel, where after the clean-up process it would be visible with the tire mounted, is only acceptable on the inboard flange. The inboard flange is not visible with the wheel assembly in the mounted position. If any loose coatings or corrosion extend to the visible surfaces on the FACE of the wheel, that wheel must be replaced. Important Remove ONLY the material required to eliminate the corrosion from the bead seating surface. DO NOT remove excessive amounts of material. ALWAYS keep the sealing surface as smooth and level as possible. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3906 Acceptably Prepared (Cleaned-Up) Wheel Surface 6. Once the corrosion has been eliminated, you should coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealant or equivalent. Commercially available bead sealants are black rubber-like coatings that will permanently fill and seal the resurfaced bead seat. At 21°C (70°F) ambient temperature, this sealant will set-up sufficiently for tire mounting in about 10 minutes.Coated and Sealed Bead Seat 7. Remount the tire and install the repaired wheel and tire assembly. Refer to Tire and Wheel Removal and Installation in SI. Parts Information Patch Brand Bead Sealer is available from Myers Tires at 1-800-998-9897 or on the web at www.myerstiresupply.com. The one-quart size can of sealer will repair about 20 wheels. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use: Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3907 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 04-03-10-012B > Feb > 08 > Wheels - Chrome Wheel Brake Dust Accumulation/Pitting Wheels: All Technical Service Bulletins Wheels - Chrome Wheel Brake Dust Accumulation/Pitting Bulletin No.: 04-03-10-012B Date: February 01, 2008 INFORMATION Subject: Pitting and Brake Dust on Chrome wheels Models: 2008 and Prior GM Passenger Cars and Trucks (including Saturn) 2008 and Prior HUMMER H2, H3 2005-2008 Saab 9-7X Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 04-03-10-012A (Section 03 - Suspension). Analysis of Returned Wheels Chrome wheels returned under the New Vehicle Limited Warranty for pitting concerns have recently been evaluated. This condition is usually most severe in the vent (or window) area of the front wheels. This "pitting" may actually be brake dust that has been allowed to accumulate on the wheel. The longer this accumulation builds up, the more difficult it is to remove. Cleaning the Wheels In all cases, the returned wheels could be cleaned to their original condition using GM Vehicle Care Cleaner Wax, P/N 12377966 (in Canada, P/N 10952905). When using this product, you should confine your treatment to the areas of the wheel that show evidence of the brake dust build-up. This product is only for use on chromed steel or chromed aluminum wheels. Parts Information Warranty Information Wheel replacement for this condition is NOT applicable under the terms of the New Vehicle Limited Warranty. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3917 Do not use cleaning solutions that contain hydrofluoric, oxalic and most other acids on chrome wheels (or any wheels). If the customer is unsure of the chemical make-up of a particular wheel cleaner, it should be avoided. For wheels showing signs of milky staining from acidic cleaners, refer to Customer Assistance and Instructions below. Warranty of Stained Chrome Wheels Stained wheels are not warrantable. Most acid based cleaners will permanently stain chrome wheels. Follow-up with dealers has confirmed that such cleaners were used on wheels that were returned to the Warranty Parts Center (WPC). Any stained wheels received by the WPC will be charged back to the dealership. To assist the customer, refer to Customer Assistance and Instructions below. Pitting or Spotted Appearance of Chrome Wheels Figure 2 A second type or staining or finish disturbance may result from road chemicals, such as calcium chloride used for dust control of unpaved roads. The staining will look like small pitting (refer to Figure 2). This staining will usually be on the leading edges of each wheel spoke, but may be uniformly distributed. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Important Road chemicals, such as calcium chloride used for dust control of unpaved roads, can also stain chrome wheels. The staining will look like small pitting. This staining will usually be on the leading edges of each wheel spoke. This is explained by the vehicle traveling in the forward direction while being splashed by the road chemical. If a vehicle must be operated under such conditions, the chrome wheels should be washed with mild soap and water and thoroughly rinsed as soon as conveniently possible. Warranty of Pitted or Spotted Chrome Wheels Wheels returned with pitting or spotting as a result of road chemicals may be replaced one time. Damage resulting from contact with these applied road chemicals is corrosive to the wheels finish and may cause damage if the wheels are not kept clean. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean if they are operating the vehicle in an area that applies calcium chloride or other dust controlling chemicals! "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). "Stardust" Corrosion of Chrome Wheels Figure 3 A third type of finish disturbance results from prolonged exposure to brake dust and resultant penetration of brake dust through the chrome. As brakes are applied hot particles of brake material are thrown off and tend to be forced through the leading edge of the wheel spoke windows by airflow. These Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3918 hot particles embed themselves in the chrome layer and create a small pit. If the material is allowed to sit on the wheel while it is exposed to moisture or salt, it will corrode the wheel beneath the chrome leaving a pit or small blister in the chrome. Heavy brake dust build-up should be removed from wheels by using GM Chrome Cleaner and Polish, P/N 1050173 (in Canada use 10953013). For moderate cleaning, light brake dust build-up or water spots use GM Swirl Remover Polish, P/N 12377965 (in Canada, use Meguiars Plast-X(TM) Clear Plastic Cleaner and Polish #G12310C**). After cleaning, the wheel should be waxed using GM Cleaner Wax, P/N 12377966 (in Canada, use Meguiars Cleaner Wax #M0616C**), which will help protect the wheel from brake dust and reduce adhesion of any brake dust that gets on the wheel surface. For general maintenance cleaning, PEEK Metal Polish† may be used. It will clean and shine the chrome and leave behind a wax coating that may help protect the finish. Warranty of Stardust Corroded Chrome Wheels Wheels returned with pitting or spotting as a result of neglect and brake dust build-up may be replaced one time. Important Notify the customer that this is a one time replacement. Please stress to the customer the vital importance of keeping the wheels clean and free of prolonged exposure to brake dust build-up. "GM of Canada" dealers require prior approval by the District Manager - Customer Care and Service Process (DM-CCSP). Customer Assistance and Instructions GM has looked for ways customers may improve the appearance of wheels damaged by acidic cleaners. The following product and procedure has been found to dramatically improve the appearance of stained wheels. For wheels that have milky stains caused by acidic cleaners try the following: Notice THE 3M CHROME AND METAL POLISH REQUIRED FOR THIS PROCEDURE IS AN EXTREMELY AGGRESSIVE POLISH/CLEANER. THE WHEELS MUST BE CLEANED BEFORE APPLICATION TO AVOID SCRATCHING THE WHEEL SURFACE. THIS PRODUCT WILL REDUCE THE THICKNESS OF THE CHROME PLATING ON THE WHEEL AND IF USED INCORRECTLY OR EXCESSIVELY MAY REMOVE THE CHROME PLATING ALL TOGETHER, EXPOSING A LESS BRIGHT AND BRASSY COLORED SUB-LAYER. FOLLOW INSTRUCTIONS EXACTLY. 1. Wash the wheels with vigorously with soap and water. This step will clean and may reduce wheel staining. Flood all areas of the wheel with water to rinse. 2. Dry the wheels completely. Notice Begin with a small section of the wheel and with light pressure buff off polish and examine results. ONLY apply and rub with sufficient force and time to remove enough staining that you are satisfied with the results. Some wheels may be stained to the extent that you may only achieve a 50% improvement while others may be able to be restored to the original lustre. IN ALL CASES, only apply until the results are satisfactory. 3. Apply 3M Chrome and Metal Polish #39527* with a clean terry cloth towel. As you apply the polish, the staining will be diminished. 4. When dry, buff off the polish with a clean portion of the towel. 5. Repeat application of the 3M Chrome and Metal Polish until satisfied with the results. If continued applications fail to improve the appearance further discontinue use. This procedure will improve the appearance of the wheels and may, with repeated applications, restore the finish dramatically. For wheels that exhibit spotting from road chemicals the above procedure may marginally improve the condition but will not restore the finish or remove the pitting. In this type of staining the wheel finish has actually been removed in spots and no manner of cleaning will restore the finish. †*We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-002F > Apr > 11 > Wheels - Chrome Wheel Staining/Pitting/Corrosion > Page 3919 *This product is currently available from 3M. To obtain information for your local retail location please call 3M at 1-888-364-3577. **This product is currently available from Meguiars (Canada). To obtain information for your local retail location please call Meguiars at 1-800-347-5700 or at www.meguiarscanada.com. ^ This product is currently available from Tri-Peek International. To obtain information for your local retail location please call Tri-Peek at 1-877-615-4272 or at www.tripeek.com. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 99-08-51-007E > Mar > 11 > Wheels/Tires - Refinishing Aluminum Wheels > Page 3924 longer. Important Whenever a wheel is refinished, the mounting surface and the wheel nut contact surfaces must not be painted or clearcoated. Coating these surfaces could affect the wheel nut torque. When re-mounting a tire on an aluminum wheel, coated balance weights must be used in order to reduce the chance of future cosmetic damage. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3929 Some customers may use penetrating oils, grease or other lubricants on wheel studs to aid in removal or installation. Always use a suitable cleaner/solvent to remove these lubricants prior to installing the wheel and tire assemblies. Lubricants left on the wheel studs may cause improper readings of wheel nut torque. Always install wheels to clean, dry wheel studs ONLY. Notice Lubricants left on the wheel studs or vertical mounting surfaces between the wheel and the rotor or drum may cause the wheel to work itself loose after the vehicle is driven. Always install wheels to clean, dry wheel studs and surfaces ONLY. Beginning with 2011 model year vehicles, put a light coating of grease, GM P/N 1051344 (in Canada, P/N 9930370), on the inner surface of the wheel pilot hole to prevent wheel seizure to the axle or bearing hub. Wheel Stud and Lug Nut Damage Always inspect the wheel studs and lug nuts for signs of damage from crossthreading or abuse. You should never have to force wheel nuts down the stud. Lug nuts that are damaged may not retain properly, yet give the impression of fully tightening. Always inspect and replace any component suspected of damage. Tip Always start wheel nuts by hand! Be certain that all wheel nut threads have been engaged BEFORE tightening the nut. Important If the vehicle has directional tread tires, verify the directional arrow on the outboard side of the tire is pointing in the direction of forward rotation. Wheel Nut Tightening and Torque Improper wheel nut tightening can lead to brake pulsation and rotor damage. In order to avoid additional brake repairs, evenly tighten the wheel nuts to the proper torque specification as shown for each vehicle in SI. Always observe the proper wheel nut tightening sequence as shown below in order to avoid trapping the wheel on the wheel stud threads or clamping the wheel slightly off center resulting in vibration. The Most Important Service You Provide While the above information is well known, and wheel removal so common, technicians run the risk of becoming complacent on this very important Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 06-03-10-010A > Jun > 10 > Wheels - Changing Procedures/Precautions > Page 3930 service operation. A simple distraction or time constraint that rushes the job may result in personal injury if the greatest of care is not exercised. Make it a habit to double check your work and to always side with caution when installing wheels. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3935 of vibration is normally felt more in the "seat of the pants" than the steering wheel. 5. Next, record the Hertz (Hz) reading as displayed by the EVA onto the tire data worksheet found at the end of this bulletin. This should be done after a tire break-in period of at least 16 km (10 mi) at 72 km/h (45 mph) or greater, in order to eliminate any possible tire flat-spotting. This reading confirms what the vehicle vibration frequency is prior to vehicle service and documents the amount of improvement occurring as the result of the various steps taken to repair. Completing the Steering Wheel Shake Worksheet below is required. A copy of the completed worksheet must be saved with the R.O. and a copy included with any parts returned to the Warranty Parts Center for analysis. A reading of 35 to 50 Hz typically indicates a first order propshaft vibration. If this is the situation, refer to Corporate Bulletin Number 08-07-30-044D. Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration and if this is the reading obtained, continue using this bulletin. If the tire 1st order vibration goes away and stays away during this evaluation, the cause is likely tire flat-spotting. Tire flat-spotting vibration may come and go at any speed over 72 km/h (45 mph) during the first 10 minutes of operation, if vibration continues after 10 minutes of driving at speeds greater than 72 km/h (45 mph), tire flat-spotting can be ruled out as the cause for vibration. 6. If flat-spotting is the cause, provide the explanation that this has occurred due to the vehicle being parked for long periods of time and that the nature of the tire is to take a set. Refer to Corporate Bulletin Number 03-03-10-007E: Information on Tire/Wheel Characteristics (Vibration, Balance, Shake, Flat Spotting) of GM Original Equipment Tires. 7. If the road test indicates a shake/vibration exists, check the imbalance of each tire/wheel assembly on a known, calibrated, off-car dynamic balancer.Make sure the mounting surface of the wheel and the surface of the balancer are absolutely clean and free of debris. Be sure to chose the proper cone/collet for the wheel, and always use the pilot bore for centering. Never center the wheel using the hub-cap bore since it is not a precision machined surface. If any assembly calls for more than 1/4 ounce on either rim flange, remove all balance weights and rebalance to as close to zero as possible. If you can see the vibration (along with feeling it) in the steering wheel (driving straight without your hands on the wheel), it is very likely to be a tire/wheel first order (one pulse per revolution) disturbance. First order disturbances can be caused by imbalance as well as non-uniformities in tires, wheels or hubs. This first order frequency is too low for a human to hear, but if the amplitude is high enough, it can be seen. If a vibration or shake still exists after balancing, any out of round conditions, of the wheel, and force variation conditions of the tire, must be addressed. Equipment such as the Hunter GSP9700 can address both (it is also a wheel balancer). Tire radial force vibration (RFV) can be defined as the amount of stiffness variation the tire will produce in one revolution under a constant load. Radial force variation is what the vehicle feels because the load (weight) of the vehicle is always on the tires. Although free runout of tires (not under load) is not always a good indicator of a smooth ride, it is critical that total tire/wheel assembly runout be within specification. Equipment such as the Hunter GSP9700 loads the tire, similar to on the vehicle, and measures radial force variation of the tire/wheel assembly. Note that the wheel is affecting the tire's RFV measurement at this point. To isolate the wheel, its runout must be measured. This can be easily done on the Hunter, without the need to set up dial indicators. If the wheel meets the runout specification, the tire's RFV can then be addressed. After measuring the tire/wheel assembly under load, and the wheel alone, the machine then calculates (predicts) the radial force variation of the tire. However, because this is a prediction that can include mounting inaccuracies, and the load wheel is much smaller in diameter than used in tire production, this type of service equipment should NOT be used to audit new tires. Rather, it should be used as a service diagnostic tool to minimize radial force variation of the tire/wheel assembly. Equipment such as the Hunter GSP9700 does an excellent job of measuring wheel runout, and of finding the low point of the wheel (for runout) and the high point of the tire (for radial force variation). This allows the tire to be matched mounted to the wheel for lowest tire/wheel assembly force variation. The machine will simplify this process into easy steps. The following assembly radial force variation numbers should be used as a guide: When measuring RFV and match mounting tires perform the following steps. Measuring Wheel Runout and Assembly Radial Force Variation Important The completed worksheet at the end of this bulletin must be attached to the hard copy of the repair order. - Measure radial force variation and radial runout. - If a road force/balancing machine is used, record the radial force variation (RFV) on the worksheet at the end of this bulletin. It may be of benefit to have the lowest RFV assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires onto the subject vehicle. - If a runout/balancing machine is used, record the radial runout of the tire/wheel assemblies on the worksheet at the end of this bulletin. If one or more of the tire/wheel assemblies are more than.040 in (1.02 mm), match mount the tire to the wheel to get below.040 in (1.02 mm). For sensitive customers, readings of 0.030 inch (0.76 mm) or less are preferable, it may also be of benefit to have the lowest runout assembly to the front left corner. If the machine is not available and the EVA data suggests there is an issue, swap the tire and wheel assemblies from the front to the back. Re-check on the EVA and if the problem still exists, test another vehicle to find tires that do not exhibit the same frequency and swap those tires Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3936 onto the subject vehicle. - After match mounting, the tire/wheel assembly must be rebalanced. If match mounting tires to in-spec wheels produces assembly values higher than these, tire replacement may be necessary. Replacing tires at lower values will probably mean good tires are being condemned. Because tires can sometimes become temporarily flat-spotted, which will affect force variation, it is important that the vehicle be driven at least 16 km (10 mi) prior to measuring. Tire pressure must also be adjusted to the usage pressure on the vehicle's tire placard prior to measuring. Most GM vehicles will tolerate radial force variation up to these levels. However, some vehicles are more sensitive, and may require lower levels. Also, there are other tire parameters that equipment such as the Hunter GSP9700 cannot measure that may be a factor. In such cases, TAC should be contacted for further instructions. Important - When mounting a GM wheel to a wheel balancer/force variation machine, always use the wheel's center pilot hole. This is the primary centering mechanism on all GM wheels; the bolt holes are secondary. Usually a back cone method to the machine should be used. For added accuracy and repeatability, a flange plate should be used to clamp the wheel onto the cone and machine. This system is offered by all balancer manufacturers in GM's dealer program. - Any type of service equipment that removes tread rubber by grinding, buffing or truing is NOT recommended, and may void the tire warranty. However, tires may have been ground by the tire company as part of their tire manufacturing process. This is a legitimate procedure. Steering Wheel Shake Worksheet When diagnosing vibration concerns, use the following worksheet in conjunction with the appropriate Vibration Analysis-Road testing procedure in the Vibration Correction sub-section in SI. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 00-03-10-006F > May > 10 > Wheels/Tires - Tire Radial Force Variation (RFV) > Page 3937 Refer to the appropriate section of SI for specifications and repair procedures that are related to the vibration concern. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 05-03-10-003F > Apr > 10 > Tires/Wheels - Low Tire/Leaking Cast Aluminum Wheels > Page 3942 10. Align the inscribed mark on the tire with the valve stem on the wheel. 11. Reinstall the Tire Pressure Sensor. Refer to Tire Pressure Sensor installation procedure in SI. 12. Mount the tire on the wheel. Refer to Tire Mounting and Dismounting. 13. Pressurize the tire to 276 kPa (40 psi) and inspect for leaks. 14. Adjust tire pressure to meet the placard specification. 15. Balance the tire/wheel assembly. Refer to Tire and Wheel Assembly Balancing - Off-Vehicle. 16. Install the tire and wheel assembly onto the vehicle. Refer to the appropriate service procedure in SI. Parts Information Warranty Information (excluding Saab U.S. Models) Important The Silicone - Adhesive/Sealant comes in a case quantity of six. ONLY charge warranty one tube of adhesive/sealant per wheel repair. For vehicles repaired under warranty, use: One leak repair per wheel. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3947 Important Other forms of slow air leaks are possible. If the body of the tire, valve stem and wheel flange show no signs of air seepage, refer to Corporate Bulletin Number 05-03-10-003D for additional information on possible wheel porosity issues. 3. Bead seat corrosion is identified by what appears like blistering of the wheel finish, causing a rough or uneven surface that is difficult for the tire to maintain a proper seal on. Below is a close-up photo of bead seat corrosion on an aluminum wheel that was sufficient to cause slow air loss. Close-Up of Bead Seat Corrosion 4. If corrosion is found on the wheel bead seat, measure the affected area as shown below. - For vehicles with 32,186 km (20,000 mi) or less, the total allowable combined linear area of repairable corrosion is 100 mm (4 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. - For vehicles that have exceeded 32,186 km (20,000 mi), the total allowable combined linear area of repairable corrosion is 200 mm (8 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced. 5. In order to correct the wheel leak, use a clean-up (fine cut) sanding disc or biscuit to remove the corrosion and any flaking paint. You should remove the corrosion back far enough until you reach material that is stable and firmly bonded to the wheel. Try to taper the edge of any flaking paint as best you can in order to avoid sharp edges that may increase the chance of a leak reoccurring. The photo below shows an acceptable repaired surface. Notice Corrosion that extends up the lip of the wheel, where after the clean-up process it would be visible with the tire mounted, is only acceptable on the inboard flange. The inboard flange is not visible with the wheel assembly in the mounted position. If any loose coatings or corrosion extend to the visible surfaces on the FACE of the wheel, that wheel must be replaced. Important Remove ONLY the material required to eliminate the corrosion from the bead seating surface. DO NOT remove excessive amounts of material. ALWAYS keep the sealing surface as smooth and level as possible. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3948 Acceptably Prepared (Cleaned-Up) Wheel Surface 6. Once the corrosion has been eliminated, you should coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealant or equivalent. Commercially available bead sealants are black rubber-like coatings that will permanently fill and seal the resurfaced bead seat. At 21°C (70°F) ambient temperature, this sealant will set-up sufficiently for tire mounting in about 10 minutes.Coated and Sealed Bead Seat 7. Remount the tire and install the repaired wheel and tire assembly. Refer to Tire and Wheel Removal and Installation in SI. Parts Information Patch Brand Bead Sealer is available from Myers Tires at 1-800-998-9897 or on the web at www.myerstiresupply.com. The one-quart size can of sealer will repair about 20 wheels. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use: Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table above. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Block Heater: > 08-03-10-006C > Apr > 10 > Tires/Wheels - Tire Slowly Goes Flat/Warning Light ON > Page 3949 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Service and Repair > Coolant Heater Replacement Engine Block Heater: Service and Repair Coolant Heater Replacement Coolant Heater Replacement (LH6 and LS2) Removal Procedure 1. Drain the cooling system. 2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle. 3. Disconnect the coolant heater (1) electrical connector. Important: Do not score the surface of the engine block hole when removing the coolant heater. 4. Remove the coolant heater from the engine block. 5. Remove any burrs, sealer, paint or other rough spots. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Service and Repair > Coolant Heater Replacement > Page 3956 1. If re-using the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the coolant heater to the engine block. ^ Tighten the coolant heater to 50 Nm (37 ft. lbs.). Notice: The heater cord must not touch the engine, hot pipes, manifold, or any moving parts. Route the cord to the left front of the engine compartment securing with tie straps as necessary to prevent damage. 3. Connect the coolant heater (1) electrical connector. 4. Lower the vehicle. 5. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Service and Repair > Coolant Heater Replacement > Page 3957 Engine Block Heater: Service and Repair Coolant Heater Cord Replacement Coolant Heater Cord Replacement Removal Procedure 1. If equipped with a 4.2L engine, remove the PCM. Refer to Powertrain Control Module (PCM) Replacement for the 4.2L engine. 2. Remove the coolant heater cord from the engine harness bracket (1). 3. Remove the coolant heater cord from the coolant heater (2). 4. If equipped with a 5.3L or 6.0L engine, disconnect the coolant heater cord from the coolant heater (1). 5. Remove the coolant heater cord clip from the engine harness. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Service and Repair > Coolant Heater Replacement > Page 3958 6. Disconnect the coolant heater cord retainers (1) from the battery cover. Installation Procedure 1. Connect the coolant heater cord retainers (1) to the battery cover. 2. If equipped with a 5.3L or 6.0L engine, connect the coolant heater cord to the coolant heater (1). 3. Install the coolant heater cord clip to the engine harness. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Block Heater > Component Information > Service and Repair > Coolant Heater Replacement > Page 3959 4. If equipped with a 4.2L engine, install the coolant heater cord to the coolant heater (2). 5. Install the coolant heater cord to the engine harness bracket (1). 6. Install the PCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Valley Cover > Component Information > Service and Repair Engine Valley Cover: Service and Repair Engine Valley Cover Replacement Removal Procedure 1. Remove the intake manifold. 2. Remove the valley cover bolts (506). 3. Remove the valley cover (555) and gasket (556). 4. Remove the O-ring seals (537) from the cover. 5. Remove the oil pressure sensor (706) and washer (707), as required. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Engine Valley Cover > Component Information > Service and Repair > Page 3963 Important: All gasket surfaces should be free of oil or other foreign material during assembly. 1. Lubricate the O-ring seals with clean engine oil. 2. Install the O-ring seals (537) to the cover (555). Notice: Refer to Fastener Notice in Service Precautions. 3. Install the cover (555), gasket (556), and bolts (506). ^ Tighten the manifold bolts to 25 Nm (18 ft. lbs.). 4. Apply sealant to the threads of the sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. 5. Install the oil pressure sensor (706) and sealing washer (707). ^ Tighten the sensor to 35 Nm (26 ft. lbs.). 6. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Harmonic Balancer Crankshaft Pulley > Component Information > Specifications Harmonic Balancer - Crankshaft Pulley: Specifications Crankshaft Balancer Bolt - Installation Pass to Ensure the Balancer is Completely Installed .............................................................. 330 Nm (240 ft. lbs.) Crankshaft Balancer Bolt - First Pass Install a NEW Bolt After the Installation Pass and Tighten as Described in the First and Final Passes .............. 50 Nm (37 ft. lbs.) Crankshaft Balancer Bolt - Final Pass ................................................................................................. ................................................................ 140 degrees Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Harmonic Balancer Crankshaft Pulley > Component Information > Specifications > Page 3967 Harmonic Balancer - Crankshaft Pulley: Service and Repair Crankshaft Balancer Replacement ^ Tools Required J 41816 Crankshaft Balancer Remover - J 41816-2 Crankshaft End Protector - J 42386-A Flywheel Holding Tool - J 41665 Crankshaft Balancer and Sprocket Installer - J 45059 Angle Meter Removal Procedure 1. Remove the accessory drive belt. 2. Remove the air conditioning (A/C) drive belt, if equipped. 3. Remove the fan shroud. 4. Remove the starter motor. Important: ^ Ensure that the teeth of J 42386-A mesh with the teeth of the engine flywheel. ^ The crankshaft balancer is balanced as an individual component. It is not necessary to mark the balancer prior to removal. Notice: Refer to Fastener Notice in Service Precautions. 5. Install J 42386-A and bolts.Use one M10-1.5 x 120 mm and one M10-1.5 x 45 mm bolt for proper tool operation. ^ Tighten J 42386-A bolts to 50 Nm (37 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Harmonic Balancer Crankshaft Pulley > Component Information > Specifications > Page 3968 6. Remove the crankshaft balancer bolt.Do not discard the crankshaft balancer bolt. The balancer bolt will be used during the balancer installation procedure. 7. Use J 41816 and J 41816-2 in order to remove the crankshaft balancer. 8. Remove J 41816 and J 41816-2 from the crankshaft balancer. 9. Clean and inspect the crankshaft balancer. Refer to Crankshaft Balancer Cleaning and Inspection. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Harmonic Balancer Crankshaft Pulley > Component Information > Specifications > Page 3969 Important: ^ Ensure that the teeth of J 42386-A mesh with the teeth of the engine flywheel. ^ The used crankshaft balancer bolt will be used only during the first pass of the balancer installation procedure. Install a NEW bolt and tighten as described in the second pass of the balancer bolt tightening procedure. ^ The crankshaft balancer installation and bolt tightening involves a 4-stage tightening process. The first pass ensures that the balancer is installed completely onto the crankshaft. The second, third, and forth passes tighten the new bolt to the proper torque. Important: Position the balancer onto the end of the crankshaft as straight as possible prior to tool installation. 1. Install the crankshaft balancer onto the end of the crankshaft. 2. Use J 41665 in order to install the crankshaft balancer. 1. Assemble the threaded rod, nut, washer, and installer.Insert the smaller end of the installer into the front of the balancer. 2. Use a wrench and hold the hex end of the threaded rod. 3. Use a second wrench and rotate the installation tool nut clockwise until the balancer is started onto the crankshaft. 4. Remove the tool and reverse the installation tool.Position the larger end of the installer against the front of the balancer. 5. Use a wrench and hold the hex end of the threaded rod. 6. Use a second wrench and rotate the installation tool nut clockwise until the balancer is installed onto the crankshaft. 7. Remove the balancer installation tool. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Harmonic Balancer Crankshaft Pulley > Component Information > Specifications > Page 3970 Notice: Refer to Fastener Notice in Service Precautions. 3. Install the used crankshaft balancer bolt. ^ Tighten the USED bolt to 330 Nm (240 ft. lbs.). 4. Remove the used crankshaft balancer bolt. Important: Recess the nose of the crankshaft 2.4 - 4.48 mm (0.094 - 0.176 inch) into the balancer bore. 5. Measure for a correctly installed balancer.If the balancer is not installed to the proper dimensions, install J 41665 and repeat the installation procedure. 6. Install a NEW crankshaft balancer bolt. 0. Tighten the bolt a first pass to 50 Nm (37 ft. lbs.). 1. Tighten the bolt a final pass to 140 degrees using J 45059. 7. Remove J 42386-A and bolts. 8. Install the starter motor. 9. Install the fan shroud. 10. Install the A/C drive belt, if equipped. 11. Install the accessory drive belt. 12. Perform the crankshaft position (CKP) system variation learn procedure. Refer to CKP System Variation Learn Procedure. See: Powertrain Management/Computers and Control Systems/Crankshaft Position Sensor/Service and Repair Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Piston, Engine > Component Information > Specifications Piston: Specifications Piston - Piston Diameter - Measured Over Skirt Coating ......................................................................................... 101.611-101.642 mm (4.0-4.001 inch) Piston - Piston to Bore Clearance - Production ..................................................................................................... -0.022-0.030 mm (-0.0009-0.0012 inch) Piston - Piston to Bore Clearance - Service Limit with Skirt Coating Worn Off ..................................................... 0.024-0.08 mm (0.00094-0.0031 inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Piston Pin, Engine > Component Information > Specifications Piston Pin: Specifications Pin - Piston Pin Clearance to Piston Pin Bore - Production ....................................................................................... 0.002-0.01 mm (0.0008-0.0004 inch) Pin Piston Pin Clearance to Piston Pin Bore - Service ......................................................................................... 0.002-0.015 mm (0.00008-0.0006 inch) Pin - Piston Pin Diameter ......................................................................................................................................... 23.952-23.955 mm (0.943-0.943 inch) Pin - Piston Pin Fit in Connecting Rod Bore - Production ..................................................................................... 0.007-0.02 mm (0.00027-0.00078 inch) Pin Piston Pin Fit in Connecting Rod Bore - Service ......................................................................................... 0.007-0.022 mm (0.00027-0.00086 inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Piston Ring, Engine > Component Information > Specifications Piston Ring: Specifications Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Production ............................................ 0.20-0.41 mm (0.008-0.016 inch) Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service ................................................. 0.20-0.41 mm (0.008-0.016 inch) Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production ....................................... 0.37-0.69 mm (0.015-0.027 inch) Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service ............................................. 0.37-0.69 mm (0.015-0.027 inch) Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production ....................................................... 0.22-0.79 mm (0.009-0.031 inch) Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service ............................................................ 0.22-0.79 mm (0.009-0.031 inch) Piston Ring to Groove Clearance - First Compression Ring - Production ................................................................. 0.030-0.10 mm (0.0012-0.0040 inch) Piston Ring to Groove Clearance - First Compression Ring Service ....................................................................... 0.030-0.10 mm (0.0012-0.0040 inch) Piston Ring to Groove Clearance - Second Compression Ring - Production ........................................................... 0.035-0.078 mm (0.0014-0.0031 inch) Piston Ring to Groove Clearance - Second Compression Ring - Service ................................................................. 0.035-0.078 mm (0.0014-0.0031 inch) Piston Ring to Groove Clearance - Oil Control Ring Production .......................................................................... 0.013-0.201 mm (0.0005-0.0079 inch) Piston Ring to Groove Clearance - Oil Control Ring - Service ................................................................................ 0.013-0.201 mm (0.0005-0.0079 inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Rear Engine Plate > Component Information > Service and Repair Rear Engine Plate: Service and Repair Engine Rear Cover Replacement ^ Tools Required J 41476 Front and Rear Cover Alignment Tool at crankshaft seal area Removal Procedure 1. Remove the engine flywheel. 2. Remove the oil pan-to-rear cover bolts (1). 3. Remove the rear cover bolts. 4. Remove the rear cover and gasket. 5. Discard the rear cover gasket. 6. Clean and inspect the rear cover. Refer to Crankshaft Rear Oil Seal Housing Cleaning and Inspection. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Rear Engine Plate > Component Information > Service and Repair > Page 3983 Important: ^ Do not reuse the crankshaft oil seal or rear cover gasket. ^ Do not apply any type of sealant to the rear cover gasket unless specified. ^ The special tool in this procedure is used to properly center the crankshaft rear oil seal. ^ Install the crankshaft rear oil seal after the rear cover has been installed and aligned.Install the rear cover without the crankshaft oil seal. ^ All gasket surfaces should be free of oil or other foreign material during assembly. ^ Center the crankshaft rear oil seal in relation to the crankshaft. ^ An improperly aligned rear cover may cause premature rear oil seal wear and/or engine assembly oil leaks. 1. Apply a 5 mm (0.2 inch) bead of sealant 20 mm (0.8 inch) long to the oil pan to engine block junction. Refer to Sealers, Adhesives, and Lubricants for the correct part number. 2. Install the rear cover gasket and cover. 3. Install the rear cover bolts until snug. Do NOT over tighten. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Block Assembly > Rear Engine Plate > Component Information > Service and Repair > Page 3984 4. Install the oil pan-to-rear cover bolts (1) until snug. Do not over tighten. 5. Rotate the crankshaft until 2 opposing flywheel bolt holes are parallel to the oil pan surface. Important: The tapered legs of the alignment tool must enter the rear cover oil seal bore. 6. Install J 41476 and bolts onto the rear of the crankshaft. Notice: Refer to Fastener Notice in Service Precautions. 7. Tighten J 41476 mounting bolts until snug. Do not overtighten. 1. Tighten the oil pan-to-rear cover bolts to 12 Nm (106 inch lbs.). 2. Tighten the engine rear cover bolts to 25 Nm (18 ft. lbs.). 8. Remove J 41476. 9. Install a NEW crankshaft rear oil seal. 10. Install the engine flywheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure Fuel Pressure Release: Service and Repair Fuel Pressure Relief Procedure FUEL PRESSURE RELIEF PROCEDURE TOOLS REQUIRED J 34730-1A Fuel Pressure Gage 1. Disconnect the negative battery cable. 2. Install J 34730-1A. 3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure. 4. Open the valve on J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing. 5. Drain any fuel remaining in the gage into an approved container. 6. Once the system pressure is completely relieved, remove J 34730-1A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure > Page 3990 Fuel Pressure Release: Service and Repair Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Rocker Arm Assembly > Component Information > Service and Repair Rocker Arm Assembly: Service and Repair Valve Rocker Arm and Push Rod Replacement Removal Procedure 1. Remove the valve rocker arm cover. Important: Place the valve rocker arms, push rods, and pivot support, in a rack so that the can be installed in the same location from which they were removed. 2. Remove the valve rocker arm bolts. 3. Remove the valve rocker arms. 4. Remove the valve rocker arm pivot support. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Rocker Arm Assembly > Component Information > Service and Repair > Page 3994 5. Remove the pushrods. 6. Clean and inspect the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rods Cleaning and Inspection. Installation Procedure Important: When reusing the valve train components, always install the components to the original location and position. 1. The valve lash is net build, no valve adjustment is required. Lubricate the valve rocker arms and pushrods with clean engine oil. 2. Lubricate the flange of the valve rocker arm bolts with clean engine oil. 3. Lubricate the flange or washer surface of the bolt that will contact the valve rocker arm. 4. Install the valve rocker arm pivot support. Important: Make sure that the pushrods seat properly to the valve lifter sockets. 5. Install the pushrods. Important: Verify that the pushrods seat properly to the ends of the rocker arms. DO NOT tighten the rocker arm bolts at this time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Rocker Arm Assembly > Component Information > Service and Repair > Page 3995 6. Install the rocker arms and bolts. 7. Rotate the crankshaft until the number one piston is at top dead center (TDC) of the compression stroke.In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position.The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3. Cylinders 1, 3, 5 and 7 are the left bank.Cylinder 2, 4, 6 and 8 are the right bank. Notice: Refer to Fastener Notice in Service Precautions. 8. With the engine in the number one firing position, tighten the following valve rocker arm bolts: ^ Tighten cylinders 1, 2, 7 and 8 exhaust valve rocker arm bolts to 30 Nm (22 ft. lbs.). ^ Tighten cylinders 1, 3, 4 and 5 intake valve rocker arm bolts to 30 Nm (22 ft. lbs.). 9. Rotate the crankshaft 360 degrees. 10. Tighten the following valve rocker arm bolts: ^ Tighten cylinders 3, 4, 5 and 6 exhaust valve rocker arm bolts to 30 Nm (22 ft. lbs.). ^ Tighten cylinders 2, 6, 7 and 8 intake valve rocker arm bolts to 30 Nm (22 ft. lbs.). 11. Install the valve rocker arm cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left Valve Cover: Service and Repair Valve Rocker Arm Cover Replacement - Left Valve Rocker Arm Cover Replacement - Left Removal Procedure 1. Remove the intake manifold sight shield. 2. Remove the connector position assurance (CPA) lock. 3. Disconnect the main electrical connector (5) to the ignition coil wire harness. 4. Remove the harness clips. 5. Reposition the engine harness, if necessary. 6. Remove the spark plug wires from the ignition coils. ^ Twist each plug wire 1/2 turn. ^ Pull only on the boot in order to remove the wire from the ignition coil. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4000 7. If necessary, remove the ignition coil bracket studs from the rocker arm cover. 8. If necessary, remove the ignition coils and bracket from the rocker arm cover. 9. Remove the positive crankcase ventilation (PCV) hose from the rocker arm cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4001 10. Remove the valve rocker arm cover bolts. 11. Remove the valve rocker arm cover. 12. Remove the gasket (1) from the rocker cover. 13. Discard the OLD gasket. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4002 Important: ^ All gasket surfaces should be free of oil an/or other foreign material during assembly. ^ DO NOT reuse the valve rocker arm cover gasket. ^ The valve rocker arm cover bolt grommets may be reused. ^ If the PCV valve grommet has been removed from the rocker cover, install a NEW grommet during assembly. 1. Install a NEW rocker cover gasket (1) into the groove of the valve rocker arm cover. 2. Install the valve rocker arm cover onto the cylinder head. 3. Install new rocker arm cover grommets, if necessary. Notice: Refer to Fastener Notice in Service Precautions. 4. Install the rocker arm cover bolts. ^ Tighten the bolts to 12 Nm (106 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4003 5. Install the PCV hose to the rocker arm cover. 6. Apply threadlock to the threads of the bracket bolts. Refer to Sealers, Adhesives, and Lubricants. 7. If necessary, install the ignition coils and bracket to the rocker arm cover. 8. If necessary, install the ignition coil bracket studs to the rocker arm cover. ^ Tighten the studs to 12 Nm (106 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4004 9. Install the spark plug wires to the ignition coils. 10. Position the engine harness, if necessary. 11. Install the harness clips. 12. Connect the main electrical connector (5) to the ignition coil wire harness. 13. Install the CPA lock. 14. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4005 Valve Cover: Service and Repair Valve Rocker Arm Cover Replacement - Right Valve Rocker Arm Cover Replacement - Right Removal Procedure 1. Remove the intake manifold sight shield. 2. Remove the air conditioning (A/C) compressor hose. 3. Remove the connector position assurance (CPA) lock. 4. Disconnect the main electrical connector (1) to the ignition coil wire harness. 5. Remove the harness clips. 6. Reposition the engine harness, if necessary. 7. Remove the spark plug wires from the ignition coils. ^ Twist each plug wire 1/2 turn. ^ Pull only on the boot in order to remove the wire from the ignition coil. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4006 8. If necessary, remove the ignition coil bracket studs from the rocker arm cover. 9. If necessary, remove the ignition coils and bracket from the rocker cover. 10. Remove the vent hose (2) from the valve rocker arm cover (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4007 11. Remove the valve rocker arm cover bolts. 12. Remove the valve rocker arm cover. 13. Remove the gasket (1) from the rocker cover. 14. Discard the OLD gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4008 15. Remove the oil fill cap from the oil fill tube. 16. Remove the oil fill tube from the rocker cover, if required. 17. Discard the oil fill tube. Installation Procedure Important: ^ All gasket surfaces should be free of oil or other foreign material during assembly. ^ DO NOT reuse the valve rocker arm cover gasket. ^ The valve rocker arm cover bolt grommets may be reused. ^ If the oil fill tube has been removed from the rocker arm cover, install a NEW fill tube during assembly. 1. Lubricate the O-ring seal of the NEW oil fill tube with clean engine oil. 2. Insert the NEW oil fill tube into the rocker arm cover.Rotate the tube clockwise until locked in the proper position. 3. Install the oil fill cap into the tube.Rotate the cap clockwise until locked in the proper position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4009 4. Install a NEW rocker cover gasket (1) into the valve rocker arm cover. 5. Install the valve rocker arm cover onto the cylinder head. 6. Install new rocker arm cover grommets, if necessary. Notice: Refer to Fastener Notice in Service Precautions. 7. Install the rocker arm cover bolts and grommets. ^ Tighten the bolts to 12 Nm (106 inch lbs.). 8. Install the vent hose (2) to the valve rocker arm cover (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Cover > Component Information > Service and Repair > Valve Rocker Arm Cover Replacement - Left > Page 4010 9. Apply threadlock to the threads of the bracket bolts. Refer to Sealers, Adhesives, and Lubricants. 10. If necessary, install the ignition coils and bracket to the rocker arm cover. 11. If necessary, install the ignition coil bracket studs to the rocker cover. ^ Tighten the studs to 12 Nm (106 inch lbs.). 12. Install the spark plug wires to the ignition coils. 13. Position the engine harness, if necessary. 14. Install the harness clips. 15. Connect the main electrical connector (1) feeding the ignition coils. 16. Install the CPA lock. 17. Install the A/C compressor hose. 18. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Spring > Component Information > Service and Repair Valve Spring: Service and Repair Valve Stem Oil Seal and Valve Spring Replacement ^ Tools Required J 22794 Spark Plug Port Adapter - J 38606 Valve Spring Compressor Removal Procedure 1. Remove the valve rocker arm. 2. Disconnect the spark plug wire at the spark plug. ^ Twist each plug wire boot 1/2 turn. ^ Pull only on the boot in order to remove the wire from the spark plug. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Spring > Component Information > Service and Repair > Page 4014 Important: Remove the spark plugs from the cylinder head with the engine at room temperature. 3. Loosen the spark plug 1-2 turns. 4. Brush or air blast away any dirt or debris from around the spark plug. 5. Remove the spark plug. 6. Install J 22794 into the spark plug hole. 7. Attach an air hose to J 22794. 8. Apply compressed air to J 22794 in order to hold the valves in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Spring > Component Information > Service and Repair > Page 4015 9. Use J 38606 in order to compress the valve spring. 10. Remove the valve stem keys (2). 11. Carefully release the valve spring tension. 12. Remove J 38606. 13. Remove the valve spring cap (3). 14. Remove the valve spring (4). 15. Remove the valve stem oil seal/shim assembly (1, 5). Installation Procedure 1. Clean the cylinder head valve spring seat and/or shim area. 2. Lubricate the valve guide and valve stem oil seal with clean engine oil. 3. Install the valve stem oil seal/shim assembly (1, 5). 4. Install the valve spring (4). 5. Install the valve spring cap (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Spring > Component Information > Service and Repair > Page 4016 6. Compress the valve spring using the J 38606. 7. Install the valve keys. 1. Use grease in order to hold the valve keys in place. 2. Make sure the keys seat properly in the groove of the valve stem. 3. Carefully release the valve spring pressure, making sure the Valve keys stay in place. 4. Remove J 38606. 5. Tap the end of the valve stem with a plastic faced hammer to seat the keys (if necessary). 8. Remove J 22794 from the spark plug port. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Valve Spring > Component Information > Service and Repair > Page 4017 Notice: Refer to Fastener Notice in Service Precautions. 9. Hand start the spark plug. ^ Tighten the spark plug to 15 Nm (11 ft. lbs.). 10. Install the spark plug wires at the ignition coil. 11. Install the spark plug wire to the spark plug. 12. Inspect the wires for proper installation: ^ Push sideways on each boot in order to check for proper installation. ^ Reinstall any loose boot. 13. Install the valve rocker arm. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Technical Service Bulletins > Engine - Drive Belt Misalignment Diagnostics Drive Belt: Technical Service Bulletins Engine - Drive Belt Misalignment Diagnostics INFORMATION Bulletin No.: 08-06-01-008A Date: July 27, 2009 Subject: Diagnosing Accessory Drive Belt / Serpentine Belt Noise and Availability and Use of Kent-Moore EN-49228 Laser Alignment Tool - Drive Belt Models: 2010 and Prior GM Passenger Cars and Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 Vehicles 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to add a model year and update the Tool Information. Please discard Corporate Bulletin Number 08-06-01-008 (Section 06 - Engine). Background Several aftermarket companies offer laser alignment tools for accessory drive systems that can be very helpful in eliminating drive belt noise as a result of misaligned pulleys. Typically pricing ranges from $160 - $200. EN-49228 Laser Alignment Tool - Drive Belt The GM Tool program has now made available a competitive, simple to use and time-saving laser tool to assist in achieving precise alignment of the drive belt pulleys. This optional tool removes the guesswork from proper pulley alignment and may serve to reduce comebacks from: - Drive Belt Noise - Accelerated Drive Belt Wear - Drive Belt Slippage Instructions The instructions below are specific only to the truck Gen IV V-8 family of engines. These instructions are only for illustrative purposes to show how the tool may be used. Universal instructions are included in the box with the Laser Alignment Tool - Drive Belt. Caution - Do not look directly into the beam projected from the laser. - Use caution when shining the laser on highly polished or reflective surfaces. Laser safety glasses help reduce laser beam glare in many circumstances. - Always use laser safety glasses when using the laser. Laser safety glasses are not designed to protect eyes from direct laser exposure. 1. Observe and mark the serpentine belt orientation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Technical Service Bulletins > Engine - Drive Belt Misalignment Diagnostics > Page 4023 2. Remove the serpentine belt from the accessory drive system. 3. Install the tool onto the power steering pulley. Position the legs of the tool into the outer grooves of the pulley, farthest from the front of the engine. 4. Install the retaining cord around the pulley and to the legs of the tool. 5. Put on the laser safety glasses provided with the tool. 6. Depress the switch on the rear of the tool to activate the light beam. 7. Rotate the power steering pulley as required to project the light beam onto the crankshaft balancer pulley grooves. 8. Inspect for proper power steering pulley alignment. - If the laser beam projects onto the second rib or raised area (1), the pulleys are aligned properly. - If the laser beam projects more than one-quarter rib 0.9 mm (0.035 in) mis-alignment, adjust the position of the power steering pulley as required. - Refer to SI for Power Steering Pulley Removal and Installation procedures. 9. Install the serpentine belt to the accessory drive system in the original orientation. 10. Operate the vehicle and verify that the belt noise concern is no longer present. Tool Information Please visit the GM service tool website for pricing information or to place your order for this tool. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Technical Service Bulletins > Engine - Drive Belt Misalignment Diagnostics > Page 4024 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Technical Service Bulletins > Page 4025 Drive Belt: Description and Operation Drive Belt System Description The drive belt system consists of the following components: ^ The drive belt ^ The drive belt tensioner ^ The drive belt idler pulley ^ The crankshaft balancer pulley ^ The accessory drive component mounting brackets ^ The accessory drive components ^ The power steering pump, if belt driven ^ The generator ^ The A/C compressor, if equipped ^ The engine cooling fan, if belt driven ^ The water pump, if belt driven ^ The vacuum pump, if equipped ^ The air compressor, if equipped The drive belt system may use 1 belt or 2 belts. The drive belt is thin so that it can bend backwards and has several ribs to match the grooves in the pulleys. There also may be a V-belt style belt used to drive certain accessory drive components. The drive belts are made of different types of rubbers - chloroprene or EPDM - and have different layers or plies containing either fiber cloth or cords for reinforcement. Both sides of the drive belt may be used to drive the different accessory drive components. When the back side of the drive belt is used to drive a pulley, the pulley is smooth. The drive belt is pulled by the crankshaft balancer pulley across the accessory drive component pulleys. The spring loaded drive belt tensioner keeps constant tension on the drive belt to prevent the drive belt from slipping. The drive belt tensioner arm will move when loads are applied to the drive belt by the accessory drive components and the crankshaft. The drive belt system may have an idler pulley, which is used to add wrap to the adjacent pulleys. Some systems use an idler pulley in place of an accessory drive component when the vehicle is not equipped with the accessory. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis Drive Belt: Testing and Inspection Drive Belt Chirping Diagnosis Drive Belt Chirping Diagnosis Diagnostic Aids The chirping noise may be intermittent due to moisture on the drive belts or the accessory drive pulleys. In order to duplicate the customer's concern, it may be necessary to spray a small amount of water onto the drive belts. If spraying water onto the drive belts duplicates the symptom, cleaning the accessory drive pulleys may be the most probable solution. A loose or improper installation of a body or suspension component, or other items on the vehicle may also cause the chirping noise. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4028 Step 1 - Step 14 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4029 Step 15 The numbers below refer to the steps in the diagnostic table. 2. The chirping noise may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed any further in this table. 3. The noise may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, this will verify if the chirping noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts for signs of pilling. Pilling is the small balls, pills, or strings in the drive belt grooves caused by the accumulation of rubber dust. 6. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of an accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned accessory drive pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that pulley. 10. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. 12. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage to the pulleys that would prevent the drive belts from seating properly in the pulley grooves or on the smooth surface of the pulley when the back side of the drive belt is used to drive the pulley. 14. Replacing the drive belts when it is not damaged or there is not excessive pilling will only be a temporary repair. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4030 Drive Belt: Testing and Inspection Drive Belt Excessive Wear Diagnosis Drive Belt Excessive Wear Diagnosis Diagnostic Aids Excessive wear on a drive belts is usually caused by incorrect installation or the incorrect drive belts for the application. Minor misalignment of the accessory drive pulleys will not cause excessive wear, but will probably cause the drive belts to make a noise or fall off. Excessive misalignment of the accessory drive pulleys will cause excessive wear and may also make the drive belts fall off. Test Description Step 1 - Step 6 The numbers below refer to the steps in the diagnostic table. 2. This inspection is to verify that the drive belts is correctly installed on all of the accessory drive pulleys. Wear on the drive belts may be caused by incorrect positioning of the drive belts by one or more grooves on a pulley. 3. The installation of a drive belts that is too wide or too narrow will cause wear on the drive belts. The drive belts ribs should match all of the grooves on the pulleys. 4. This inspection is to verify that the drive belts is not contacting any part of the engine or body while the engine is operating. Provide sufficient clearance when the accessory drive components load varies. The drive belts should not come in contact with an engine or a body component when snapping the throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4031 Drive Belt: Testing and Inspection Drive Belt Falls Off Diagnosis Drive Belt Falls Off Diagnosis Diagnostic Aids If the drive belts repeatedly falls off the accessory drive pulleys, this may be caused by a pulley misalignment. An extra load that is quickly applied or released by an accessory drive component may also cause the drive belts to fall off. Verify that the accessory drive components are operating properly. If the drive belts is the incorrect length, the drive belt tensioner may not maintain the proper tension on the drive belts. Test Description Step 1 - Step 12 The numbers below refer to the steps in the diagnostic table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4032 2. This inspection is to verify the condition of the drive belts. Damage may have occurred to the drive belts when the drive belts fell off the pulley. Inspect the drive belts for cuts, tears, sections of ribs missing, or damaged belt plies. 4. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure of that pulley. 5. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage that would prevent the drive belt from seating properly in the pulley grooves or on the smooth surface of a pulley when the back side of the drive belts is used to drive the pulley. 6. Accessory drive component brackets that are bent or cracked will also cause the drive belts to fall off. 7. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. Missing, loose, or incorrect fasteners may cause pulley misalignment from the accessory drive brackets moving under load. Over tightening the fasteners may cause misalignment of the accessory component brackets. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4033 Drive Belt: Testing and Inspection Drive Belt Rumbling Diagnosis Diagnostic Information and Procedures Drive Belt Rumbling Diagnosis Diagnostic Aids Vibration from the engine operating may cause a body component or another part of the vehicle to make rumbling noise. The drive belts may have a condition that can not be seen or felt. Sometimes replacing the drive belts may be the only repair for the symptom. If after replacing the drive belts and completing the diagnostic table, the rumbling is only heard with the drive belts installed, there might be an accessory drive component failure. Varying the load on the accessory drive components may aid in identifying which component is causing the rumbling noise. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4034 Step 1 - Step 8 The numbers below refer to the steps in the diagnostic table. 2. This test is to verify that the symptom is present during diagnosing. Other vehicle components may cause a similar symptom. 3. This test is to verify that the drive belts is causing the rumbling. Rumbling may be confused with an internal engine noise due to the similarity in the description. Remove only one drive belt at a time if the vehicle has multiple drive belts. Operate the engine for a few seconds, this will verify if the rumbling noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts to ensure that the drive belts is not the cause of the noise. Small cracks across the ribs of the drive belts will not cause the noise. Belt separation is identified by the plies of the belt separating, this may be seen at the edge of the belt or felt as a lump in the belt. 5. Small amounts of pilling is a normal condition and acceptable. When the pilling is severe the drive belts does not have a smooth surface for proper operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4035 Drive Belt: Testing and Inspection Drive Belt Chirping Diagnosis Drive Belt Chirping Diagnosis Diagnostic Aids The chirping noise may be intermittent due to moisture on the drive belts or the accessory drive pulleys. In order to duplicate the customer's concern, it may be necessary to spray a small amount of water onto the drive belts. If spraying water onto the drive belts duplicates the symptom, cleaning the accessory drive pulleys may be the most probable solution. A loose or improper installation of a body or suspension component, or other items on the vehicle may also cause the chirping noise. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4036 Step 1 - Step 14 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4037 Step 15 The numbers below refer to the steps in the diagnostic table. 2. The chirping noise may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed any further in this table. 3. The noise may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, this will verify if the chirping noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts for signs of pilling. Pilling is the small balls, pills, or strings in the drive belt grooves caused by the accumulation of rubber dust. 6. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of an accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned accessory drive pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that pulley. 10. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. 12. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage to the pulleys that would prevent the drive belts from seating properly in the pulley grooves or on the smooth surface of the pulley when the back side of the drive belt is used to drive the pulley. 14. Replacing the drive belts when it is not damaged or there is not excessive pilling will only be a temporary repair. Drive Belt Excessive Wear Diagnosis Drive Belt Excessive Wear Diagnosis Diagnostic Aids Excessive wear on a drive belts is usually caused by incorrect installation or the incorrect drive belts for the application. Minor misalignment of the accessory drive pulleys will not cause excessive wear, but will probably cause the drive belts to make a noise or fall off. Excessive misalignment of the accessory drive pulleys will cause excessive wear and may also make the drive belts fall off. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4038 Step 1 - Step 6 The numbers below refer to the steps in the diagnostic table. 2. This inspection is to verify that the drive belts is correctly installed on all of the accessory drive pulleys. Wear on the drive belts may be caused by incorrect positioning of the drive belts by one or more grooves on a pulley. 3. The installation of a drive belts that is too wide or too narrow will cause wear on the drive belts. The drive belts ribs should match all of the grooves on the pulleys. 4. This inspection is to verify that the drive belts is not contacting any part of the engine or body while the engine is operating. Provide sufficient clearance when the accessory drive components load varies. The drive belts should not come in contact with an engine or a body component when snapping the throttle. Drive Belt Falls Off Diagnosis Drive Belt Falls Off Diagnosis Diagnostic Aids If the drive belts repeatedly falls off the accessory drive pulleys, this may be caused by a pulley misalignment. An extra load that is quickly applied or released by an accessory drive component may also cause the drive belts to fall off. Verify that the accessory drive components are operating properly. If the drive belts is the incorrect length, the drive belt tensioner may not maintain the proper tension on the drive belts. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4039 Step 1 - Step 12 The numbers below refer to the steps in the diagnostic table. 2. This inspection is to verify the condition of the drive belts. Damage may have occurred to the drive belts when the drive belts fell off the pulley. Inspect the drive belts for cuts, tears, sections of ribs missing, or damaged belt plies. 4. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure of that pulley. 5. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage that would prevent the drive belt from seating properly in the pulley grooves or on the smooth surface of a pulley when the back side of the drive belts is used to drive the pulley. 6. Accessory drive component brackets that are bent or cracked will also cause the drive belts to fall off. 7. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. Missing, loose, or incorrect fasteners may cause pulley misalignment from the accessory drive brackets moving under load. Over tightening the fasteners may cause misalignment of the accessory component brackets. Drive Belt Rumbling Diagnosis Diagnostic Information and Procedures Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4040 Drive Belt Rumbling Diagnosis Diagnostic Aids Vibration from the engine operating may cause a body component or another part of the vehicle to make rumbling noise. The drive belts may have a condition that can not be seen or felt. Sometimes replacing the drive belts may be the only repair for the symptom. If after replacing the drive belts and completing the diagnostic table, the rumbling is only heard with the drive belts installed, there might be an accessory drive component failure. Varying the load on the accessory drive components may aid in identifying which component is causing the rumbling noise. Test Description Step 1 - Step 8 The numbers below refer to the steps in the diagnostic table. 2. This test is to verify that the symptom is present during diagnosing. Other vehicle components may cause a similar symptom. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4041 3. This test is to verify that the drive belts is causing the rumbling. Rumbling may be confused with an internal engine noise due to the similarity in the description. Remove only one drive belt at a time if the vehicle has multiple drive belts. Operate the engine for a few seconds, this will verify if the rumbling noise is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. Inspect the drive belts to ensure that the drive belts is not the cause of the noise. Small cracks across the ribs of the drive belts will not cause the noise. Belt separation is identified by the plies of the belt separating, this may be seen at the edge of the belt or felt as a lump in the belt. 5. Small amounts of pilling is a normal condition and acceptable. When the pilling is severe the drive belts does not have a smooth surface for proper operation. Drive Belt Squeal Diagnosis Drive Belt Squeal Diagnosis Diagnostic Aids A loose or improper installation of a body, or suspension component, or other items on the vehicle may cause the squeal noise. If the squeal is intermittent, verify that it is not the accessory drive components by varying their loads, making sure they are operating to their maximum capacity. An overcharged air conditioning (A/C) system, a power steering system restriction or the incorrect fluid, or a failing generator are suggested items to inspect. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4042 Step 1 - Step 9 The numbers below refer to the steps in the diagnostic table. 2. The squeal may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed further in this table 3. The squeal may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, this will verify if the squealing noise is related to the drive belts or an accessory drive component. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. This test is to verify that an accessory drive components does not have a seized bearing. With the belts removed, test the bearings in the accessory drive components for smooth operation. Also test the accessory drive components with the engine operating by varying the load on the accessory drive components to verify that the components is operating properly. 5. This test is to verify that the drive belts tensioners are not operating properly. If the drive belt tensioners are not operating properly, proper belt tension may not be achieved to keep the drive belts from slipping which could cause a squealing noise. 6. This test is to verify that the drive belts is not too long, which would prevent the drive belt tensioners from operating properly. Also if the incorrect length drive belts was installed, it may not be routed correctly and may be turning an accessory drive component in the incorrect direction. 7. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a accessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that pulley. 8. Inspect the accessory drive pulleys to verify that they are the correct diameter or width. Using a known good vehicle, compare the accessory drive pulleys. Drive Belt Vibration Diagnosis Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4043 Drive Belt Vibration Diagnosis Diagnostic Aids The accessory drive components may have an affect on engine vibration. An overcharged air conditioning (A/C) system, a power steering system restriction, or the incorrect fluid, or an extra load placed on the generator are suggested items to inspect. To help identify an intermittent or an improper condition, vary the loads on the accessory drive components. Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4044 Step 1 - Step 11 The numbers below refer to the steps in the diagnostic table. 2. This test is to verify that the vibration is present during diagnosing. Other vehicle components may cause a similar symptom such as the exhaust system, or the drivetrain. 3. This test is to verify that the drive belts or accessory drive components may be causing the vibration. Remove the drive belts and operate the engine for a few seconds, this will verify if the vibration is related to the drive belts or not. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. The drive belts may cause a vibration. While the drive belts is removed this is the best time to inspect the condition of the drive belts. 6. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. 8. This step should only be performed if the fan is driven by the drive belt. Inspect the engine cooling fan for bent, twisted, loose, or cracked blades. Inspect the fan clutch for smooth operation. Inspect for a bent fan shaft or bent mounting flange. 9. Inspect the water pump drive shaft for being bent. Also inspect the water pump bearings for smooth operation and excessive play. Compare the water pump with a known, good water pump. 10. Accessory drive component brackets that are bent, cracked, or loose may put an extra strain on that accessory drive component causing it to vibrate. Drive Belt Whine Diagnosis Drive Belt Whine Diagnosis Diagnostic Aids The drive belts will not cause the whine. If the whine is intermittent, verify that it is not the accessory drive components by varying their loads, making sure they are operating to their maximum capacity. An overcharged air conditioning (A/C) system, a power steering system restriction or the incorrect fluid, or a failing generator are suggested items to inspect. Test Description Step 1 - Step 5 The numbers below refer to the steps in the diagnostic table. 3. This test is to verify that the whine is being caused by the accessory drive components. Remove the drive belts and operate the engine for a few seconds, this will verify if the whining noise is related to the accessory drive component. With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belts removed. 4. This inspection should include checking the drive belt tensioner and the drive belt idler pulley bearings. The drive belts may have to be installed and the accessory drive components operated separately by varying their loads. Refer to the suspected accessory drive component for the proper Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Testing and Inspection > Drive Belt Chirping Diagnosis > Page 4045 removal and installation procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Service and Repair > Drive Belt Replacement - Accessory Drive Belt: Service and Repair Drive Belt Replacement - Accessory Drive Belt Replacement - Accessory Removal Procedure 1. Remove the air cleaner resonator outlet duct. 2. Install a breaker bar with hex-head socket to the drive belt tensioner bolt. 3. Rotate the drive belt tensioner clockwise in order to relieve tension on the belt. 4. Remove the belt from the generator pulley. 5. Slowly release the tension on the drive belt tensioner. 6. Remove the breaker bar and socket and from the drive belt tensioner bolt. 7. Remove the belt from the remaining pulleys. 8. Clean and inspect the belt surfaces of all the pulleys. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Service and Repair > Drive Belt Replacement - Accessory > Page 4048 1. Route the drive belt around all the pulleys except the generator pulley. 2. Install the breaker bar with hex-head socket to the belt tensioner bolt. 3. Rotate the belt tensioner clockwise in order to relieve the tension on the belt. 4. Install the drive belt on the generator pulley. 5. Slowly release the tension on the belt tensioner. 6. Remove the breaker bar and socket from the belt tensioner bolt. 7. Inspect the drive belt for proper installation and alignment. 8. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt > Component Information > Service and Repair > Drive Belt Replacement - Accessory > Page 4049 Drive Belt: Service and Repair Drive Belt Replacement - Air Conditioning Drive Belt Replacement - Air Conditioning Removal Procedure 1. Remove the accessory drive belt. 2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 3. Install a ratchet into the square opening of the air conditioning (A/C) belt tensioner. 4. Rotate the A/C belt tensioner clockwise in order to relieve tension on the belt. 5. Remove the A/C belt from the pulleys. 6. Slowly release the tension on the A/C belt tensioner. 7. Remove the ratchet from the A/C belt tensioner. 8. Clean and inspect the belt surfaces of all the pulleys. Installation Procedure 1. Install the A/C belt around the crankshaft balancer. 2. Install a ratchet into the square opening of the A/C drive belt tensioner. 3. Rotate the A/C belt tensioner clockwise in order to relieve tension on the belt. 4. Install the A/C belt over the idler pulley. 5. Install the A/C belt around the A/C compressor pulley. 6. Slowly release the tension on the A/C belt tensioner. 7. Remove the ratchet from the A/C belt tensioner. 8. Inspect the A/C belt for proper installation and alignment. 9. Lower the vehicle. 10. Install the accessory drive belt. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt Tensioner > Component Information > Testing and Inspection Drive Belt Tensioner: Testing and Inspection Drive Belt Tensioner Diagnosis Inspection Procedure 5GNotice: Allowing the drive belt tensioner to snap into the free position may result in damage to the tensioner. Important: When the engine is operating the drive belt tensioner arm will move. Do not replace the drive belt tensioner because of movement in the drive belt tensioner arm. 1. Remove the drive belt. 2. Move the drive belt tensioner through its full travel. ^ The movement should feel smooth. ^ There should be no binding. ^ The tensioner should return freely. 3. If any binding is observed, replace the drive belt tensioner. 4. Install the drive belt. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt Tensioner > Component Information > Service and Repair > Drive Belt Tensioner Replacement - Air Conditioning Drive Belt Tensioner: Service and Repair Drive Belt Tensioner Replacement - Air Conditioning Drive Belt Tensioner Replacement - Air Conditioning Removal Procedure 1. Remove the air conditioning (A/C) drive belt. 2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle. 3. Remove the A/C belt tensioner bolts. 4. Remove the A/C belt tensioner. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt Tensioner > Component Information > Service and Repair > Drive Belt Tensioner Replacement - Air Conditioning > Page 4055 1. Install the A/C belt tensioner. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the A/C belt tensioner bolts. ^ Tighten the bolts to 50 Nm (37 ft. lbs.). 3. Lower the vehicle. 4. Install the A/C drive belt. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Drive Belt Tensioner > Component Information > Service and Repair > Drive Belt Tensioner Replacement - Air Conditioning > Page 4056 Drive Belt Tensioner: Service and Repair Drive Belt Tensioner Replacement Drive Belt Tensioner Replacement - Accessory Removal Procedure 1. Remove the accessory drive belt. 2. Remove the drive belt tensioner bolts. 3. Remove the drive belt tensioner. Installation Procedure 1. Install the drive belt tensioner. 2. Install the drive belt tensioner bolts. Notice: Refer to Fastener Notice in Service Precautions. 3. Tighten the drive belt tensioner bolts. ^ Tighten the bolts to 50 Nm (37 ft. lbs.). 4. Install the accessory drive belt. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Testing and Inspection Engine Mount: Testing and Inspection Engine Mount Inspection Front Engine Mount 1. Notice: Broken or deteriorated mounts can cause misalignment and destruction of certain drive train components. When a single mount breaks, the remaining mounts are subjected to abnormally high stresses. Install a pole jack underneath the oil pan. 2. Insert a block of wood between the engine oil pan and the pole jack. 3. Raise the jack until the wooden block contacts the engine oil pan. 4. Raise the engine in order to place a slight tension on the rubber cushion. Observe both mounts while raising the engine. 5. Replace the mounts if any of the following conditions exist: ^ Hard rubber surface covered with heat check cracks ^ The rubber cushion separated from the metal plate of the mount ^ The rubber cushion is split through the center ^ The mount is leaking 6. If there is movement between a metal plate of the mount and its attaching points, lower the engine and tighten the bolts or nuts attaching the mount to the engine, the frame or the bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left Engine Mount: Service and Repair Engine Mount Replacement - Left Engine Mount Replacement - Left (Two-Wheel Drive) Removal Procedure 1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the front tire and wheels. 3. Remove the engine protection shield. 4. Remove the shock module. 5. Remove the lower engine mount retaining nuts from the engine mount frame bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4062 6. Remove the 3 mounting bolts that secure the upper engine mount bracket to the engine block bracket. 7. Remove the 3 frame engine mount bracket retaining bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4063 8. Install a pole jack underneath the oil pan. 9. Insert a block of wood between the oil pan and the pole jack. 10. Raise the engine 21/4 inches measuring from the bottom of the oil pan to the front edge of the transmission support crossmember. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4064 11. Remove the engine mount frame bracket from the frame. 12. Remove the engine mount with the upper engine mount bracket as an assembly. 13. Separate the engine mount from the upper engine mount bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4065 14. Remove the engine mount bracket spacer if damaged. Installation Procedure Notice: Refer to Fastener Notice in Service Precautions. 1. Install the engine mount bracket spacer if necessary. ^ Tighten the spacer bolts to 50 Nm (37 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4066 Important: Verify that the cut out side of the engine mount shield is positioned away from the engine. 2. Install the engine mount to the upper engine mount bracket. ^ Tighten the engine mount nuts to 50 Nm (37 ft. lbs.). 3. Install the engine mount to the engine. ^ Tighten the engine mount bolts to 50 Nm (37 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4067 4. Install the engine mount frame bracket to the frame. 5. Install the retaining bolts to the engine mount frame bracket. 6. Install the left side engine mount frame bracket. 7. Install the retaining bolts to the left side engine mount frame bracket. ^ Tighten the bolts to 100 Nm (74 ft. lbs.). 8. Lower the engine, aligning the engine mount studs with the holes in the frame bracket. 9. Remove the pole jack and block of wood. 10. Tighten the engine mount nuts. ^ Tighten the nuts to 50 Nm (37 ft. lbs.). 11. Install the shock module. 12. Install the engine protection shield. 13. Install the front tire and wheels. 14. Lower the vehicle. Refer to Lifting and Jacking the Vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4068 Engine Mount: Service and Repair Engine Mount Replacement - Right Engine Mount Replacement - Right (Two-Wheel Drive) Removal Procedure 1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the front tire and wheels. 3. Remove the engine protection shield. 4. Remove the shock module. 5. Remove the lower engine mount retaining nuts from the engine mount frame bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4069 6. Remove the 3 mounting bolts that secure the upper engine mount bracket to the engine block bracket. 7. Remove the 3 bracket retaining bolts from the frame engine mount. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4070 8. Install a pole jack underneath the oil pan. 9. Insert a block of wood between the oil pan and the pole jack. 10. Raise the engine 21/4 inches measuring from the bottom of the oil pan to the front edge of the transmission support crossmember. 11. Shift the engine towards the left side of the frame. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4071 12. Remove the engine mount frame bracket from the frame. 13. Remove the engine mount with the upper engine mount bracket as an assembly. 14. Separate the engine mount from the upper engine mount bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4072 15. Remove the engine mount bracket spacer if damaged. Installation Procedure Notice: Refer to Fastener Notice in Service Precautions. 1. Install the engine mount bracket spacer if it has been replaced. ^ Tighten the bolts to 50 Nm (37 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4073 Important: Make sure that the cut out side of the engine mount shield is positioned away from the engine. 2. Install the engine mount to the upper engine mount bracket. ^ Tighten the engine mount nuts to 50 Nm (37 ft. lbs.). 3. Install the engine mount to engine. ^ Tighten the engine mount bolts to 50 Nm (37 ft. lbs.). 4. Install the engine mount frame bracket to the frame. 5. Install the engine mount frame bracket retaining bolts. ^ Tighten the bolts to 100 Nm (74 ft. lbs.). 6. Shift engine back to the right side of the frame. 7. Install the left side engine mount frame bracket. 8. Install the retaining bolts to the left side of the engine mount frame bracket. ^ Tighten the bolts to 100 Nm (74 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Service and Repair > Engine Mount Replacement - Left > Page 4074 9. Lower the engine, aligning the engine mount studs with the holes in the frame bracket. 10. Remove the pole jack and the block of wood. 11. Tighten the engine mount nuts. ^ Tighten the nuts to 50 Nm (37 ft. lbs.). 12. Install the shock module. 13. Install the engine protection shield. 14. Install the front tire and wheels. 15. Lower the vehicle. Refer to Lifting and Jacking the Vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Idler Pulley > Component Information > Service and Repair Idler Pulley: Service and Repair Drive Belt Idler Pulley Replacement Removal Procedure 1. Remove the accessory drive belt. 2. Remove the drive belt idler pulley and bolt. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Idler Pulley > Component Information > Service and Repair > Page 4078 1. Notice: Refer to Fastener Notice in Service Precautions. Install the drive belt idler pulley and bolt to the generator bracket. ^ Tighten the bolt to 50 Nm (37 ft. lbs.). 2. Install the drive belt. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil Pressure > Component Information > Specifications Engine Oil Pressure: Specifications Oil Pressure - Minimum - Hot .............................................................................................................. .................................................................................... 41 kPa at 1,000 engine RPM .......................... .............................................................................................................................................................. ......... 124 kPa at 2,000 engine RPM ................................................................................................... .............................................................................................. 165 kPa at 4,000 engine RPM .............. .............................................................................................................................................................. ........................ 6 psig at 1,000 engine RPM ....................................................................................... ........................................................................................................... 18 psig at 2,000 engine RPM .. .............................................................................................................................................................. .................................. 24 psig at 4,000 engine RPM Oil Pressure Relief Valve Oil Pressure - as Measured at Oil Pressure Sensor Location ............................ 379-517 kPa Maximum (55-75 psig Maximum) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil Pressure > Component Information > Testing and Inspection > Oil Pressure Diagnosis and Testing Engine Oil Pressure: Testing and Inspection Oil Pressure Diagnosis and Testing Oil Pressure Diagnosis and Testing ^ Tools Required J 21867 Pressure Gage - J 42907 Oil Pressure Tester 1. With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level. 2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator. 3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gage or light. 4. Listen for a noisy valve train or a knocking noise. 5. Inspect for the following conditions: ^ Oil diluted by water or glycol antifreeze ^ Foamy oil 6. Remove the oil filter and install the J 42907. 7. Install J 21867 or equivalent to the J 42907. 8. Run the engine and measure the engine oil pressure. 9. Compare the readings to Engine Mechanical Specifications. 10. If the engine oil pressure is below specifications, inspect the engine for one or more of the following conditions: ^ Oil pump worn or dirty Refer to Oil Pump Cleaning and Inspection. ^ Oil pump-to-engine block bolts loose Refer to Oil Pump, Screen and Crankshaft Oil Deflector Installation. ^ Oil pump screen loose, plugged, or damaged ^ Oil pump screen O-ring seal missing or damaged ^ Oil transfer tube loose or a leaking or damaged gasket ^ Malfunctioning oil pump pressure relief valve ^ Excessive bearing clearance ^ Cracked, porous, or restricted oil galleries ^ Oil gallery plugs missing or incorrectly installed Refer to Engine Block Plug Installation. ^ Broken valve lifters Repair as necessary. ^ Improper operation of the oil pressure relief valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil Pressure > Component Information > Testing and Inspection > Oil Pressure Diagnosis and Testing > Page 4085 Engine Oil Pressure: Testing and Inspection Oil Pressure Relief Valve Diagnosis and Testing Oil Pressure Relief Valve Diagnosis and Testing ^ Tools Required J 21867 Pressure Gage - J 21867-16 Oil Pressure Adapter - J 42907 Oil Pressure Tester Important: This test is performed to verify the operation of the oil pressure relief valve mounted in the oil pan. Refer to Lubrication Description (Component Locator) Lubrication Description (Main Pressure Below 55 psi) Lubrication Description (Main Pressure Above 55 psi). 1. With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level. 2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator. 3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gage or light. 4. Listen for a noisy valve train or a knocking noise. 5. Inspect for the following conditions: ^ Oil diluted by water or glycol antifreeze ^ Foamy oil 6. Remove the oil filter and install the J 42907 (1). 7. Install J 21867 (2), or equivalent to the J 42907 (1). 8. Remove the oil pressure sensor and install the J-21867-16. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil Pressure > Component Information > Testing and Inspection > Oil Pressure Diagnosis and Testing > Page 4086 9. Install J 21867, or equivalent to the J-21867-16. 10. Run the engine and measure the engine oil pressure while observing both gages.Operate the throttle, as required, to increase and decrease the engine oil pressure. ^ With the engine running and the lower pressure gage (2) measuring below 379 kPa (55 psi), both gages should display the same pressure reading. If the readings are not the same and the lower gage (2) has a higher reading, the oil pressure relief valve is stuck in the open position. ^ With the engine running and the lower pressure gage (2) measuring above 379 kPa (55 psi), the upper gage (1) should display no greater than 379 - 517 kPa (55 - 75 psi). If the reading on the upper gage (1) is greater than 517 kPa (75 psi), the oil pressure relief valve is stuck in the closed position. 11. Repair, as required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil Dip Stick - Dip Stick Tube > Component Information > Service and Repair Engine Oil Dip Stick - Dip Stick Tube: Service and Repair Oil Level Indicator and Tube Replacement Removal Procedure 1. Remove the cylinder number 2 spark plug and wire. 2. Remove the oil level indicator from the tube. 3. Remove the oil level indicator tube bolt. 4. Remove the oil level indicator tube from the engine block. Important: The O-ring seal may be reused if not cut or damaged. 5. Inspect the O-ring seal for cuts or damage. 6. Remove the O-ring seal from the tube, if required. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil Dip Stick - Dip Stick Tube > Component Information > Service and Repair > Page 4090 1. Lubricate the O-ring seal with clean engine oil. 2. Install the O-ring seal onto the oil level indicator tube. 3. Install the oil level indicator tube behind the exhaust manifold. 4. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle. 5. Install the oil level indicator tube into the block. Install the tube with the collar flush to the block. 6. Lower the vehicle. Notice: Refer to Fastener Notice in Service Precautions. 7. Install the oil level indicator tube bolt ^ Tighten the bolt to 25 Nm (18 ft. lbs.). 8. Install the oil level indicator to the tube. 9. Install the cylinder number 2 spark plug and wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Technical Service Bulletins > Engine - GM dexos 1 and dexos 2(R) Oil Specifications Engine Oil: Technical Service Bulletins Engine - GM dexos 1 and dexos 2(R) Oil Specifications INFORMATION Bulletin No.: 11-00-90-001 Date: March 14, 2011 Subject: Global Information for GM dexos1(TM) and GM dexos2(TM) Engine Oil Specifications for Spark Ignited and Diesel Engines, Available Licensed Brands, and Service Fill for Adding or Complete Oil Change Models: 2012 and Prior GM Passenger Cars and Trucks Excluding All Vehicles Equipped with Duramax(TM) Diesel Engines GM dexos 1(TM) Information Center Website Refer to the following General Motors website for dexos 1(TM) information about the different licensed brands that are currently available: http://www.gmdexos.com GM dexos 1(TM) Engine Oil Trademark and Icons The dexos(TM) specification and trademarks are exclusive to General Motors, LLC. Only those oils displaying the dexos‹›(TM) trademark and icon on the front label meet the demanding performance requirements and stringent quality standards set forth in the dexos‹›(TM) specification. Look on the front label for any of the logos shown above to identify an authorized, licensed dexos 1(TM) engine oil. GM dexos 1(TM) Engine Oil Specification Important General Motors dexos 1(TM) engine oil specification replaces the previous General Motors specifications GM6094M, GM4718M and GM-LL-A-025 for most GM gasoline engines. The oil specified for use in GM passenger cars and trucks, PRIOR to the 2011 model year remains acceptable for those previous vehicles. However, dexos 1(TM) is backward compatible and can be used in those older vehicles. In North America, starting with the 2011 model year, GM introduced dexos 1(TM) certified engine oil as a factory fill and service fill for gasoline engines. The reasons for the new engine oil specification are as follows: - To meet environmental goals such as increasing fuel efficiency and reducing engine emissions. - To promote long engine life. - To minimize the number of engine oil changes in order to help meet the goal of lessening the industry's overall dependence on crude oil. dexos 1(TM) is a GM-developed engine oil specification that has been designed to provide the following benefits: - Further improve fuel economy, to meet future corporate average fuel economy (CAFE) requirements and fuel economy retention by allowing the oil to maintain its fuel economy benefits throughout the life of the oil. - More robust formulations for added engine protection and aeration performance. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Technical Service Bulletins > Engine - GM dexos 1 and dexos 2(R) Oil Specifications > Page 4095 - Support the GM Oil Life System, thereby minimizing the replacement of engine oil, before its life has been depleted. - Reduce the duplication of requirements for a large number of internal GM engine oil specifications. International Lubricants Standardization and Approval Committee (ILSAC) GF-5 Standard In addition to GM dexos 1(TM), a new International Lubricants Standardization and Approval Committee (ILSAC) standard called GF-5, was introduced in October 2010. - There will be a corresponding API category, called: SN Resource Conserving. The current GF-4 standard was put in place in 2004 and will become obsolete in October 2011. Similar to dexos 1(TM), the GF-5 standard will use a new fuel economy test, Sequence VID, which demands a statistically significant increase in fuel economy versus the Sequence VIB test that was used for GF-4. - It is expected that all dexos 1(TM) approved oils will be capable of meeting the GF-5 standard. However, not all GF-5 engine oils will be capable of meeting the dexos 1(TM) specification. - Like dexos(TM), the new ILSAC GF-5 standard will call for more sophisticated additives. The API will begin licensing marketers during October 2010, to produce and distribute GF-5 certified products, which are expected to include SAE 0W-20, 0W-30, 5W-20, 5W-30 and 10W-30 oils. Corporate Average Fuel Economy (CAFE) Requirements Effect on Fuel Economy Since CAFE standards were first introduced in 1974, the fuel economy of cars has more than doubled, while the fuel economy of light trucks has increased by more than 50 percent. Proposed CAFE standards call for a continuation of increased fuel economy in new cars and trucks. To meet these future requirements, all aspects of vehicle operation are being looked at more critically than ever before. New technology being introduced in GM vehicles designed to increase vehicle efficiency and fuel economy include direct injection, cam phasing, turbocharging and active fuel management (AFM). The demands of these new technologies on engine oil also are taken into consideration when determining new oil specifications. AFM for example can help to achieve improved fuel economy. However alternately deactivating and activating the cylinders by not allowing the intake and exhaust valves to open contributes to additional stress on the engine oil. Another industry trend for meeting tough fuel economy mandates has been a shift toward lower viscosity oils. dexos 1(TM) will eventually be offered in several viscosity grades in accordance with engine needs: SAE 0W-20, 5W-20, 0W-30 and 5W-30. Using the right viscosity grade oil is critical for proper engine performance. Always refer to the Maintenance section of a vehicle Owner Manual for the proper viscosity grade for the engine being serviced. GM Oil Life System in Conjunction With dexos (TM) Supports Extended Oil Change Intervals To help conserve oil while maintaining engine protection, many GM vehicles are equipped with the GM Oil Life System. This system can provide oil change intervals that exceed the traditional 3,000 mile (4,830 km) recommendation. The dexos (TM) specification, with its requirements for improved oil robustness, compliments the GM Oil Life System by supporting extended oil change intervals over the lifetime of a vehicle. If all GM customers with GM Oil Life System equipped vehicles would use the system as intended, GM estimates that more than 100 million gallons of oil could be saved annually. GM dexos 2(TM) Information Center Website Refer to the following General Motors website for dexos 2(TM) information about the different licensed brands that are currently available: http://www.gmdexos.com GM dexos 2(TM) Engine Oil Trademark and Icons Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Technical Service Bulletins > Engine - GM dexos 1 and dexos 2(R) Oil Specifications > Page 4096 The dexos (TM) specification and trademarks are exclusive to General Motors, LLC. Only those oils displaying the dexos (TM) trademark and icon on the front label meet the demanding performance requirements and stringent quality standards set forth in the dexos (TM)specification. Look on the front label for any of the logos shown above to identify an authorized, licensed dexos 2(TM) engine oil. GM dexos 2(TM) Engine Oil Specification - dexos 2(TM) is approved and recommended by GM for use in Europe starting in model year 2010 vehicles, regardless of where the vehicle was manufactured. - dexos 2(TM) is the recommended service fill oil for European gasoline engines. Important The Duramax(TM) diesel engine is the exception and requires lubricants meeting specification CJ-4. - dexos 2(TM) is the recommended service fill oil for European light-duty diesel engines and replaces GM-LL-B-025 and GM-LL-A-025. - dexos 2(TM) protects diesel engines from harmful soot deposits and is designed with limits on certain chemical components to prolong catalyst life and protect expensive emission reduction systems. It is a robust oil, resisting degradation between oil changes and maintaining optimum performance longer. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Specifications > Capacity Specifications Engine Oil: Capacity Specifications Engine Oil with Filter ............................................................................................................................ ............................................... 6.0 quarts (5.7 liters) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Specifications > Capacity Specifications > Page 4099 Engine Oil: Fluid Type Specifications ENGINE OIL TYPE LOOK FOR THESE THINGS: 1.Your vehicle's engine requires a special oil meeting GM Standard GM4718M. Oils meeting this standard may be identified as synthetic. However, not all synthetic oils will meet this GM standard. You should look for and use only an oil that meets GM Standard GM4718M. NOTICE: If you use oils that do not have the GM4718M Standard designation, you can cause engine damage not covered by your warranty. 2.SAE 5W-30 is best for your vehicle. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 20W-50. Oils meeting these requirements should also have the starburst symbol on the container. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). You should look for this on the oil container, and use only those oils that are identified as meeting GM Standard GM4718M and have the starburst symbol on the front of the oil container. Your vehicle's engine is filled at the factory with a Mobil 1 synthetic oil, which meets all requirements for your vehicle. Substitute Engine Oil: When adding oil to maintain engine oil level, oil meeting GM Standard GM4718M may not be available. You can add substitute oil designated SAE 5W-30 with the starburst symbol at all temperatures. Substitute oil not meeting GM Standard GM4718M should not be used for an oil change. ENGINE OIL ADDITIVES Do not add anything to your oil. The recommended oils with the starburst symbol that meet GM Standard GM4718M are all you will need for good performance and engine protection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Specifications > Page 4100 Engine Oil: Service and Repair Engine Oil and Oil Filter Replacement Removal Procedure Important: In order to completely drain the oil from the oil pan internal baffling, the bottom of the oil pan must be level during the oil drain procedure. 1. Open the hood. 2. Remove the intake manifold sight shield. 3. Remove the oil fill cap. 4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. 5. Position a suitable drain pan under the oil pan drain plug. 6. Remove the oil pan drain plug. 7. Allow the oil to drain completely. 8. Clean and inspect the oil pan drain plug, replace if necessary. 9. Clean and inspect the oil pan drain plug sealing surface, replace the oil pan if necessary. 10. Wipe any remaining oil from the drain plug hole and reinstall the oil pan drain plug until snug. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Specifications > Page 4101 11. Position a suitable drain pan under the oil filter. 12. Remove the oil filter. 13. Ensure that the oil filter gasket is still on the old filter, if not remove the oil filter gasket from the oil pan. Installation Procedure 1. Apply clean engine oil to the NEW oil filter gasket. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the NEW oil filter. ^ Tighten the filter to 30 Nm (22 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Engine Oil > Component Information > Specifications > Page 4102 3. Tighten the oil drain plug. ^ Tighten the drain plug to 25 Nm (18 ft. lbs.). 4. Remove the oil drain pan from under the vehicle. 5. Lower the vehicle. 6. Fill the crankcase with new engine oil. Refer to Capacities - Approximate Fluid and Fluid and Lubricant Recommendations. 7. Start the engine. 8. Inspect for oil leaks after engine start up. 9. Turn off the engine and allow the oil a few minutes to drain back into the oil pan. 10. Remove the oil level indicator from the oil indicator tube. 11. Clean off the indicator end of the oil level indicator with a clean paper towel or cloth. 12. Install the oil level indicator into the oil level indicator tube until the oil level indicator handle contacts the top of the oil level indicator tube. 13. Again, remove the oil level indicator from the oil level indicator tube keeping the tip of the oil level indicator down. 14. Check the level of the engine oil on the oil level indicator. 15. If necessary, adjust the oil level by adding or draining oil. 16. Check for oil leaks. 17. Install the intake manifold sight shield. 18. Close the hood. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Filter, Engine > Component Information > Technical Service Bulletins > Engine - Noise/Damage Oil Filter Application Importance Oil Filter: Technical Service Bulletins Engine - Noise/Damage Oil Filter Application Importance INFORMATION Bulletin No.: 07-06-01-016B Date: July 27, 2009 Subject: Information on Internal Engine Noise or Damage After Oil Filter Replacement Models: 2010 and Prior Passenger Cars and Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being updated to add model years. Please discard Corporate Bulletin Number 07-06-01-016A (Section 06 - Engine/Propulsion System). Important Engine damage that is the result of an incorrect or improperly installed engine oil filter is not a warrantable claim. The best way to avoid oil filter quality concerns is to purchase ACDelco(R) oil filters directly from GMSPO. Oil filter misapplication may cause abnormal engine noise or internal damage. Always utilize the most recent parts information to ensure the correct part number filter is installed when replacing oil filters. Do not rely on physical dimensions alone. Counterfeit copies of name brand parts have been discovered in some aftermarket parts systems. Always ensure the parts you install are from a trusted source. Improper oil filter installation may result in catastrophic engine damage. Refer to the appropriate Service Information (SI) installation instructions when replacing any oil filter and pay particular attention to procedures for proper cartridge filter element alignment. If the diagnostics in SI (Engine Mechanical) lead to the oil filter as the cause of the internal engine noise or damage, dealers should submit a field product report. Refer to Corporate Bulletin Number 02-00-89-002I (Information for Dealers on How to Submit a Field Product Report). Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Filter, Engine > Component Information > Technical Service Bulletins > Page 4107 Oil Filter: Service and Repair Engine Oil and Oil Filter Replacement Removal Procedure Important: In order to completely drain the oil from the oil pan internal baffling, the bottom of the oil pan must be level during the oil drain procedure. 1. Open the hood. 2. Remove the intake manifold sight shield. 3. Remove the oil fill cap. 4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. 5. Position a suitable drain pan under the oil pan drain plug. 6. Remove the oil pan drain plug. 7. Allow the oil to drain completely. 8. Clean and inspect the oil pan drain plug, replace if necessary. 9. Clean and inspect the oil pan drain plug sealing surface, replace the oil pan if necessary. 10. Wipe any remaining oil from the drain plug hole and reinstall the oil pan drain plug until snug. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Filter, Engine > Component Information > Technical Service Bulletins > Page 4108 11. Position a suitable drain pan under the oil filter. 12. Remove the oil filter. 13. Ensure that the oil filter gasket is still on the old filter, if not remove the oil filter gasket from the oil pan. Installation Procedure 1. Apply clean engine oil to the NEW oil filter gasket. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the NEW oil filter. ^ Tighten the filter to 30 Nm (22 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Filter, Engine > Component Information > Technical Service Bulletins > Page 4109 3. Tighten the oil drain plug. ^ Tighten the drain plug to 25 Nm (18 ft. lbs.). 4. Remove the oil drain pan from under the vehicle. 5. Lower the vehicle. 6. Fill the crankcase with new engine oil. Refer to Capacities - Approximate Fluid and Fluid and Lubricant Recommendations. 7. Start the engine. 8. Inspect for oil leaks after engine start up. 9. Turn off the engine and allow the oil a few minutes to drain back into the oil pan. 10. Remove the oil level indicator from the oil indicator tube. 11. Clean off the indicator end of the oil level indicator with a clean paper towel or cloth. 12. Install the oil level indicator into the oil level indicator tube until the oil level indicator handle contacts the top of the oil level indicator tube. 13. Again, remove the oil level indicator from the oil level indicator tube keeping the tip of the oil level indicator down. 14. Check the level of the engine oil on the oil level indicator. 15. If necessary, adjust the oil level by adding or draining oil. 16. Check for oil leaks. 17. Install the intake manifold sight shield. 18. Close the hood. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Filter Adapter > Component Information > Service and Repair Oil Filter Adapter: Service and Repair Oil Filter Adapter Replacement Removal Procedure 1. Remove the oil filter. 2. Remove the oil filter adapter (1). Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Filter Adapter > Component Information > Service and Repair > Page 4113 Notice: Refer to Fastener Notice in Service Precautions. 1. Install the oil filter adapter (1). ^ Tighten the adapter to 55 Nm (40 ft. lbs.). 2. Install the oil filter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications Oil Pan: Specifications Oil Pan M6 Bolts - Oil Pan-to-Rear Oil Seal Housing ........................................................................................................................ 12 Nm (106 inch lbs.) Oil Pan M8 Bolts - Oil Pan-to-Engine Block and Oil Pan-to-Front Cover ............................................................................................... 25 Nm (18 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4117 Oil Pan: Service and Repair Oil Pan Replacement Removal Procedure 1. Disconnect the negative battery cable. 2. Remove the oil level indicator tube. 3. If equipped with four-wheel drive, remove the front differential and secure to the frame. Refer to Differential Carrier Assembly Replacement (4.2L In-Line Six Cylinder) Differential Carrier Assembly Replacement (V8). 4. Drain the engine oil. Refer to Engine Oil and Oil Filter 5. Remove the transmission oil cooler lines (1) from the retainer (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4118 6. Remove the transmission oil cooler line retaining bracket bolt and bracket. 7. Remove the starter. 8. Remove the flywheel inspection cover from the left side of the transmission. 9. Remove the battery cable channel bolt from the front of the oil pan. 10. Remove the battery cable channel from the oil pan. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4119 11. Loosen the 2 upper air conditioning (A/C) compressor bracket bolts (4). 12. Remove the 2 lower A/C compressor bracket bolts (3). 13. Remove the 2 lower bellhousing bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4120 14. Remove the oil pan bolts. 15. Remove the oil pan by tilting the rear of the oil pan down to clear the transmission, pull the oil pan rearward past the front wire harness, then lower the oil pan clear of the vehicle. Important: ^ The oil pan gasket is reusable. It is NOT necessary to remove the oil pan gasket unless damaged. ^ DO NOT allow foreign material to enter the oil passages of the oil pan, cap or cover the openings as required. 16. Drill out the oil pan gasket retaining rivets (2), if required. 17. Remove the gasket (1) from the pan. 18. Discard the gasket and rivets. 19. Clean and inspect the oil pan. Refer to Oil Pan Cleaning and Inspection. Installation Procedure Important: ^ The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the transmission bellhousing. To ensure the rigidity of the powertrain and correct transmission alignment, it is important that the rear of the block and the rear of the oil pan must NEVER protrude beyond the engine block and transmission bellhousing plane. ^ If replacing the oil pan gasket it is not necessary to rivet the NEW gasket to the oil pan. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4121 1. Apply a 5 mm (0.20 inch) bead of 20 mm (0.80 inch) long to the engine block. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface. 2. Apply a 5 mm (0.20 inch) bead of sealant 20 mm (0.80 inch) long to the engine block. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Apply the sealant directly onto the tabs of the rear cover gasket that protrudes into the oil pan surface. 3. Pre-assemble the oil pan gasket and bolts to the pan. ^ Install the gasket onto the pan. ^ Install the oil pan bolts to the pan and through the gasket. 4. Install the oil pan, oil pan gasket, and bolts to the engine block as an assembly. 5. Hand thread the oil pan bolts into the engine block until snug. Do not tighten at this time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4122 Notice: Refer to Fastener Notice in Service Precautions. 6. Install the 2 lower bellhousing bolts. 1. Tighten the lower bellhousing bolts to 50 Nm (37 ft. lbs.). 2. Tighten the 2 rear oil pan to rear cover bolts to 12 Nm (106 inch lbs.). 3. Tighten the remaining oil pan bolts to 25 Nm (18 ft. lbs.). 7. Install the 2 lower A/C compressor bracket bolts (3). ^ Tighten the bolts to 50 Nm (37 ft. lbs.). 8. Tighten the 2 upper A/C compressor bracket bolts (4). ^ Tighten the bolts to 50 Nm (37 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4123 9. Install the battery cable channel to the oil pan. 10. Install the battery cable channel bolt to the oil pan. ^ Tighten the bolt to 12 Nm (106 inch lbs.). 11. Install the flywheel inspection cover to the left side of the transmission. 12. Install the starter. 13. If equipped with four-wheel drive, install the inner axle shaft. 14. Install the transmission oil cooler line retaining bracket and bolt. ^ Tighten the bolt to 9 Nm (80 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pan, Engine > Component Information > Specifications > Page 4124 15. Install the transmission oil cooler lines (1) to the retainer (2). 16. Install the oil level indicator tube. 17. Fill the engine with oil. Refer to Engine Oil and Oil Filter Replacement. 18. Install the front differential. 19. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pressure Sender > Component Information > Diagrams Engine Oil Pressure (EOP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: Customer Interest Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 4136 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: All Technical Service Bulletins Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 4142 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 4143 Oil Pressure Sensor: Service and Repair Engine Oil Pressure Sensor and/or Switch Replacement ^ Tools Required J 41712 Oil Pressure Switch Socket Removal Procedure 1. Remove the intake manifold. 2. Disconnect the oil pressure sensor electrical connector (1). 3. Using J 41712 or equivalent, remove the oil pressure sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 4144 1. Apply sealant to the threads of the oil pressure sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Notice: Refer to Fastener Notice in Service Precautions. 2. Using J 41712 or equivalent, install the oil pressure sensor. ^ Tighten the sensor to 20 Nm (15 ft. lbs.). 3. Connect the oil pressure sensor electrical connector (1). 4. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pump, Engine > Engine Oil Pressure > Component Information > Specifications Engine Oil Pressure: Specifications Oil Pressure - Minimum - Hot .............................................................................................................. .................................................................................... 41 kPa at 1,000 engine RPM .......................... .............................................................................................................................................................. ......... 124 kPa at 2,000 engine RPM ................................................................................................... .............................................................................................. 165 kPa at 4,000 engine RPM .............. .............................................................................................................................................................. ........................ 6 psig at 1,000 engine RPM ....................................................................................... ........................................................................................................... 18 psig at 2,000 engine RPM .. .............................................................................................................................................................. .................................. 24 psig at 4,000 engine RPM Oil Pressure Relief Valve Oil Pressure - as Measured at Oil Pressure Sensor Location ............................ 379-517 kPa Maximum (55-75 psig Maximum) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pump, Engine > Engine Oil Pressure > Component Information > Testing and Inspection > Oil Pressure Diagnosis and Testing Engine Oil Pressure: Testing and Inspection Oil Pressure Diagnosis and Testing Oil Pressure Diagnosis and Testing ^ Tools Required J 21867 Pressure Gage - J 42907 Oil Pressure Tester 1. With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level. 2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator. 3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gage or light. 4. Listen for a noisy valve train or a knocking noise. 5. Inspect for the following conditions: ^ Oil diluted by water or glycol antifreeze ^ Foamy oil 6. Remove the oil filter and install the J 42907. 7. Install J 21867 or equivalent to the J 42907. 8. Run the engine and measure the engine oil pressure. 9. Compare the readings to Engine Mechanical Specifications. 10. If the engine oil pressure is below specifications, inspect the engine for one or more of the following conditions: ^ Oil pump worn or dirty Refer to Oil Pump Cleaning and Inspection. ^ Oil pump-to-engine block bolts loose Refer to Oil Pump, Screen and Crankshaft Oil Deflector Installation. ^ Oil pump screen loose, plugged, or damaged ^ Oil pump screen O-ring seal missing or damaged ^ Oil transfer tube loose or a leaking or damaged gasket ^ Malfunctioning oil pump pressure relief valve ^ Excessive bearing clearance ^ Cracked, porous, or restricted oil galleries ^ Oil gallery plugs missing or incorrectly installed Refer to Engine Block Plug Installation. ^ Broken valve lifters Repair as necessary. ^ Improper operation of the oil pressure relief valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pump, Engine > Engine Oil Pressure > Component Information > Testing and Inspection > Oil Pressure Diagnosis and Testing > Page 4151 Engine Oil Pressure: Testing and Inspection Oil Pressure Relief Valve Diagnosis and Testing Oil Pressure Relief Valve Diagnosis and Testing ^ Tools Required J 21867 Pressure Gage - J 21867-16 Oil Pressure Adapter - J 42907 Oil Pressure Tester Important: This test is performed to verify the operation of the oil pressure relief valve mounted in the oil pan. Refer to Lubrication Description (Component Locator) Lubrication Description (Main Pressure Below 55 psi) Lubrication Description (Main Pressure Above 55 psi). 1. With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level. 2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator. 3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gage or light. 4. Listen for a noisy valve train or a knocking noise. 5. Inspect for the following conditions: ^ Oil diluted by water or glycol antifreeze ^ Foamy oil 6. Remove the oil filter and install the J 42907 (1). 7. Install J 21867 (2), or equivalent to the J 42907 (1). 8. Remove the oil pressure sensor and install the J-21867-16. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pump, Engine > Engine Oil Pressure > Component Information > Testing and Inspection > Oil Pressure Diagnosis and Testing > Page 4152 9. Install J 21867, or equivalent to the J-21867-16. 10. Run the engine and measure the engine oil pressure while observing both gages.Operate the throttle, as required, to increase and decrease the engine oil pressure. ^ With the engine running and the lower pressure gage (2) measuring below 379 kPa (55 psi), both gages should display the same pressure reading. If the readings are not the same and the lower gage (2) has a higher reading, the oil pressure relief valve is stuck in the open position. ^ With the engine running and the lower pressure gage (2) measuring above 379 kPa (55 psi), the upper gage (1) should display no greater than 379 - 517 kPa (55 - 75 psi). If the reading on the upper gage (1) is greater than 517 kPa (75 psi), the oil pressure relief valve is stuck in the closed position. 11. Repair, as required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pump, Engine > Oil Pressure Regulator Valve > Component Information > Service and Repair Oil Pressure Regulator Valve: Service and Repair Oil Filter Bypass Valve Replacement Removal Procedure 1. Remove the oil filter. 2. Remove the oil filter adapter (1). 3. Remove the oil filter bypass valve (2). Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Engine Lubrication > Oil Pump, Engine > Oil Pressure Regulator Valve > Component Information > Service and Repair > Page 4156 1. Install the oil filter bypass valve (2). Notice: Refer to Fastener Notice in Service Precautions. 2. Install the oil filter adapter (1). ^ Tighten the adapter to 55 Nm (40 ft. lbs.). 3. Install the oil filter. ^ Tighten the filter to 30 Nm (22 ft. lbs.). 4. Refill the engine oil if necessary. Refer to Capacities - Approximate Fluid or to Fluid and Lubricant Recommendations in Maintenance and Lubrication. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Engine - Intake Manifold Inspection/Replacement Intake Manifold: Technical Service Bulletins Engine - Intake Manifold Inspection/Replacement INFORMATION Bulletin No.: 00-06-01-026C Date: February 03, 2010 Subject: Intake Manifold Inspection/Replacement After Severe Internal Engine Damage Models: 2010 and Prior Passenger Cars and Trucks (Including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to include additional model years. Please discard Corporate Bulletin Number 00-06-01-026B (Section 06 - Engine). When replacing an engine due to internal damage, extreme care should be taken when transferring the intake manifold to the new Goodwrench service engine long block. Internal damage may result in the potential discharge of internal engine component debris in the intake manifold via broken pistons and/or bent, broken, or missing intake valves. After removing the intake manifold from the engine, the technician should carefully inspect all of the cylinder head intake ports to see if the valve heads are still present and not bent. Usually when the valve heads are missing or sufficiently bent, internal engine component debris will be present to varying degrees in the intake port of the cylinder head. If this debris is present in any of the cylinder head intake ports, the intake manifold should be replaced. This replacement is required due to the complex inlet runner and plenum configuration of most of the intake manifolds, making thorough and complete component cleaning difficult and nearly impossible to verify complete removal of debris. Re-installation of an intake manifold removed from an engine with deposits of internal engine component debris may result in the ingestion of any remaining debris into the new Goodwrench service engine. This may cause damage or potential failure of the new service engine. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4161 Intake Manifold: Specifications Intake Manifold Bolts - First Pass in Sequence ....................................................................................................................................... 5 Nm (44 inch lbs.) Intake Manifold Bolts - Final Pass in Sequence .................................................................................................................................... 10 Nm (89 inch lbs.) Throttle Body Bolts .............................................................................................................................. ................................................. 10 Nm (89 inch lbs.) Throttle Body Nuts ............................................ .................................................................................................................................... 10 Nm (89 inch lbs.) Throttle Body Studs ..................................................................................................................... ........................................................... 6 Nm (53 inch lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4162 Intake Manifold: Service and Repair Intake Manifold Replacement Removal Procedure Important: The intake manifold, throttle body, fuel rail, and injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly. 1. Disconnect the negative battery cable. 2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure. 3. Disconnect the engine wiring harness electrical connector (3) from the air conditioning (A/C) compressor pressure switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4163 4. Disconnect the engine harness wiring harness electrical connector (1) from the mass air flow (MAF) intake air temperature (IAT) sensor. 5. Disconnect the engine wiring harness electrical connector (1) from the electronic throttle control (ETC). 6. Remove the right side connector position assurance (CPA) retainer (4) from the engine wiring harness main ignition coil electrical connector. 7. Disconnect the right side engine wiring harness electrical connector (3) from the main ignition coil electrical connector. 8. Disconnect the right side engine wiring harness electrical connectors (2) from the fuel injectors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4164 9. Perform the following steps in order to disconnect the fuel injector electrical connectors. 1. Mark the connectors to their corresponding injectors to ensure correct reassembly. 2. Pull the connector position assurance (CPA) retainer (2) on the connector up one click. 3. Push the tab (1) on the connector in. 4. Disconnect the fuel injector electrical connector. 5. Repeat the steps for each injector electrical connector. 10. Remove the left side CPA retainer (3) from the engine wiring harness main ignition coil electrical connector. 11. Disconnect the left side engine wiring harness electrical connector (2) from the main ignition coil electrical connector. 12. Disconnect the left side engine wiring harness electrical connectors (1) from the fuel injectors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4165 13. Perform the following steps in order to disconnect the fuel injector electrical connectors. 1. Mark the connectors to their corresponding injectors to ensure correct reassembly. 2. Pull the connector position assurance (CPA) retainer (2) on the connector up one click. 3. Push the tab (1) on the connector in. 4. Disconnect the fuel injector electrical connector. 5. Repeat the steps for each injector electrical connector. 14. Disconnect the engine wiring harness electrical connector from the generator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4166 15. Disconnect the engine wiring harness electrical connector (1) from the manifold absolute pressure (MAP) sensor. 16. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) canister purge solenoid valve. 17. Remove the positive crankcase ventilation (PCV) hose. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4167 18. Remove the EVAP purge solenoid vent tubes (1, 2). 19. Disconnect the fuel feed pipe (3) from the fuel rail (2). 20. Reposition the vacuum brake booster hose clamp at the brake booster. 21. Remove the vacuum brake booster hose from the brake booster. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4168 22. Remove the engine wire harness retainer nut. 23. Reposition the upper engine wire harness aside. 24. Remove the drive belt. 25. Remove the right generator bolt. 26. Loosen the left generator bolt and reposition the generator to the left. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4169 27. Remove the intake manifold bolts (512). 28. Remove the intake manifold. 29. Remove the intake manifold gaskets (514) from the intake manifold. 30. Discard the old intake manifold gaskets. 31. If necessary, clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4170 1. Install NEW intake manifold gaskets (514) to the intake manifold. 2. Install the intake manifold. 3. Apply a 5 mm (0.2 inch) bead threadlock to the threads of the intake manifold bolts. Refer to Sealers, Adhesives, and Lubricants. Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4171 4. Install the intake manifold bolts. 1. Tighten the bolts a first pass in sequence to 5 Nm (44 inch lbs.). 2. Tighten the bolts a final pass in sequence to 10 Nm (89 inch lbs.). 5. Position the generator and install the right generator bolt. 6. Tighten the left generator bolt. ^ Tighten the bolts to 50 Nm (37 ft. lbs.). 7. Install the drive belt. 8. Route the electrical harness into position over the engine. 9. Install the engine harness bracket nut. ^ Tighten the nut to 10 Nm (89 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4172 10. Install the vacuum brake booster hose to the brake booster. 11. Position the vacuum brake booster hose clamp at the brake booster. 12. Connect the fuel feed pipe (3) to the fuel rail (2). 13. Install the EVAP purge solenoid vent tubes (1, 2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4173 14. Install the PCV hose. 15. Connect the engine wiring harness electrical connector (1) to the MAP sensor. 16. Connect the engine wiring harness electrical connector (2) to the EVAP canister purge solenoid valve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4174 17. Connect the engine wiring harness electrical connector to the generator. 18. Connect the left side engine wiring harness electrical connector (2) to the main ignition coil electrical connector. 19. Install the left side CPA retainer (3) to the engine wiring harness main ignition coil electrical connector. 20. Connect the left side engine wiring harness electrical connectors (1) to the fuel injectors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4175 21. Perform the following steps in order to connect the fuel injector electrical connectors: 1. Install the connectors to their corresponding injectors to ensure correct reassembly. 2. Connect the fuel injector electrical connector. 3. Push the CPA retainer (2) on the connector in one click. 4. Repeat the steps for each injector electrical connector. 22. Connect the engine wiring harness electrical connector (1) to the ETC. 23. Connect the right side engine wiring harness electrical connector (3) to the main ignition coil electrical connector. 24. Install the right side CPA retainer (4) to the engine wiring harness main ignition coil electrical connector. 25. Connect the right side engine wiring harness electrical connectors (2) to the fuel injectors. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4176 26. Perform the following steps in order to connect the fuel injector electrical connectors: 1. Install the connectors to their corresponding injectors to ensure correct reassembly. 2. Connect the fuel injector electrical connector. 3. Push the CPA retainer (2) on the connector in one click. 4. Repeat the steps for each injector electrical connector. 27. Connect the engine harness wiring harness electrical connector (1) to the MAF/IAT sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Intake Manifold > Component Information > Technical Service Bulletins > Page 4177 28. Connect the engine wiring harness electrical connector (3) to the A/C compressor pressure switch. 29. Install the fuel fill cap. 30. Connect the negative battery cable. 31. Use the following procedure in order to inspect for leaks: 1. Turn the ignition ON, with the engine OFF, for 2 seconds. 2. Turn the ignition OFF for 10 seconds. 3. Turn the ignition ON, with the engine OFF. 4. Inspect for fuel leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Crankshaft Main Bearing Seal > Component Information > Service and Repair Crankshaft Main Bearing Seal: Service and Repair Crankshaft Rear Oil Seal Replacement ^ Tools Required J 41479 Crankshaft Rear Oil Seal Installer Removal Procedure 1. Remove the engine flywheel. 2. Remove the crankshaft rear oil seal (1) from the rear cover. Installation Procedure Important: ^ Remove the flywheel spacer, if applicable, prior to oil seal installation. ^ Do not lubricate the oil seal inside diameter or the crankshaft surface. ^ Do not reuse the crankshaft rear oil seal. 1. Lubricate the outside diameter of the oil seal (1) with clean engine oil.DO NOT allow oil or other lubricants to contact the seal surface. 2. Lubricate the rear cover oil seal bore with clean engine oil.DO NOT allow oil or other lubricants to contact the crankshaft surface. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Crankshaft Main Bearing Seal > Component Information > Service and Repair > Page 4182 3. Install J 41479 tapered cone (2) and bolts onto the rear of the crankshaft. 4. Tighten the bolts until snug. Do not overtighten. 5. Install the rear oil seal onto the tapered cone (2) and push the seal to the rear cover bore. 6. Thread J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal. 7. Align the oil seal into the tool (1). 8. Rotate the handle of the tool (1) clockwise until the seal enters the rear cover and bottoms into the cover bore. 9. Remove J 41479. 10. Install the engine flywheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Front Crankshaft Seal > Component Information > Service and Repair Front Crankshaft Seal: Service and Repair Crankshaft Front Oil Seal Replacement ^ Tools Required J 41478 Crankshaft Front Oil Seal Installer Removal Procedure 1. Remove the radiator. 2. Remove the crankshaft balancer. 3. Remove the crankshaft oil seal (1) from the front cover. Installation Procedure Important: ^ Do not lubricate the oil seal sealing surface. ^ Do not reuse the crankshaft oil seal. 1. Lubricate the outer edge of the oil seal (1) with clean engine oil. 2. Lubricate the front cover oil seal bore with clean engine oil. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Front Crankshaft Seal > Component Information > Service and Repair > Page 4186 3. Install the crankshaft front oil seal onto the J 41478 guide. 4. Install J 41478 threaded rod with nut, washer, guide, and oil seal into the end of the crankshaft. 5. Use J 41478 in order to install the oil seal into the cover bore. 1. Use a wrench and hold the hex on the installer bolt. 2. Use a second wrench and rotate the installer nut clockwise until the seal bottoms in the cover bore. 3. Remove J 41478. 4. Inspect the oil seal for proper installation.The oil seal should be installed evenly and completely into the front cover bore. 6. Install the crankshaft balancer. 7. Install the radiator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Valve Guide Seal > Component Information > Service and Repair Valve Guide Seal: Service and Repair Valve Stem Oil Seal and Valve Spring Replacement ^ Tools Required J 22794 Spark Plug Port Adapter - J 38606 Valve Spring Compressor Removal Procedure 1. Remove the valve rocker arm. 2. Disconnect the spark plug wire at the spark plug. ^ Twist each plug wire boot 1/2 turn. ^ Pull only on the boot in order to remove the wire from the spark plug. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Valve Guide Seal > Component Information > Service and Repair > Page 4190 Important: Remove the spark plugs from the cylinder head with the engine at room temperature. 3. Loosen the spark plug 1-2 turns. 4. Brush or air blast away any dirt or debris from around the spark plug. 5. Remove the spark plug. 6. Install J 22794 into the spark plug hole. 7. Attach an air hose to J 22794. 8. Apply compressed air to J 22794 in order to hold the valves in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Valve Guide Seal > Component Information > Service and Repair > Page 4191 9. Use J 38606 in order to compress the valve spring. 10. Remove the valve stem keys (2). 11. Carefully release the valve spring tension. 12. Remove J 38606. 13. Remove the valve spring cap (3). 14. Remove the valve spring (4). 15. Remove the valve stem oil seal/shim assembly (1, 5). Installation Procedure 1. Clean the cylinder head valve spring seat and/or shim area. 2. Lubricate the valve guide and valve stem oil seal with clean engine oil. 3. Install the valve stem oil seal/shim assembly (1, 5). 4. Install the valve spring (4). 5. Install the valve spring cap (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Valve Guide Seal > Component Information > Service and Repair > Page 4192 6. Compress the valve spring using the J 38606. 7. Install the valve keys. 1. Use grease in order to hold the valve keys in place. 2. Make sure the keys seat properly in the groove of the valve stem. 3. Carefully release the valve spring pressure, making sure the Valve keys stay in place. 4. Remove J 38606. 5. Tap the end of the valve stem with a plastic faced hammer to seat the keys (if necessary). 8. Remove J 22794 from the spark plug port. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Seals and Gaskets, Engine > Valve Guide Seal > Component Information > Service and Repair > Page 4193 Notice: Refer to Fastener Notice in Service Precautions. 9. Hand start the spark plug. ^ Tighten the spark plug to 15 Nm (11 ft. lbs.). 10. Install the spark plug wires at the ignition coil. 11. Install the spark plug wire to the spark plug. 12. Inspect the wires for proper installation: ^ Push sideways on each boot in order to check for proper installation. ^ Reinstall any loose boot. 13. Install the valve rocker arm. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Sensors and Switches - Engine > Oil Pressure Sender > Component Information > Diagrams Engine Oil Pressure (EOP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: Customer Interest Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 4206 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: All Technical Service Bulletins Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 4212 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 4213 Oil Pressure Sensor: Service and Repair Engine Oil Pressure Sensor and/or Switch Replacement ^ Tools Required J 41712 Oil Pressure Switch Socket Removal Procedure 1. Remove the intake manifold. 2. Disconnect the oil pressure sensor electrical connector (1). 3. Using J 41712 or equivalent, remove the oil pressure sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Sensors and Switches - Engine > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 4214 1. Apply sealant to the threads of the oil pressure sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Notice: Refer to Fastener Notice in Service Precautions. 2. Using J 41712 or equivalent, install the oil pressure sensor. ^ Tighten the sensor to 20 Nm (15 ft. lbs.). 3. Connect the oil pressure sensor electrical connector (1). 4. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Camshaft Gear/Sprocket > Component Information > Specifications Camshaft Gear/Sprocket: Specifications Camshaft Sprocket Bolts ..................................................................................................................... ..................................................... 25 Nm (18 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Chain > Component Information > Service and Repair Timing Chain: Service and Repair Timing Chain and Sprockets Replacement ^ Tools Required J 8433-1 Puller Bar - J 41558 Crankshaft Sprocket Remover - J 41665 Crankshaft Balancer and Sprocket Installer - J 41816-2 Crankshaft End Protector Removal Procedure 1. Remove the oil pump. Notice: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves. 2. Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned. 3. Remove the camshaft sprocket bolts (1). 4. Remove the camshaft sprocket (2) and timing chain (3). 5. Use J 8433-1, J 41816-2 and J 41558 in order to remove the crankshaft sprocket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Chain > Component Information > Service and Repair > Page 4222 6. Remove the crankshaft sprocket. 7. Remove the crankshaft sprocket key, if required. 8. Clean and inspect the timing chain and sprockets. Refer to Timing Chain and Sprockets Cleaning and Inspection. Installation Procedure 1. Install the key into the crankshaft keyway, if previously removed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Chain > Component Information > Service and Repair > Page 4223 2. Tap the key (1) into the keyway until both ends of the key bottom onto the crankshaft. 3. Install the crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway. 4. Use J 41665 in order to install the crankshaft sprocket.Install the sprocket onto the crankshaft until fully seated against the crankshaft flange. 5. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Chain > Component Information > Service and Repair > Page 4224 Important: ^ Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole. ^ The sprocket teeth and timing chain must mesh. ^ The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.Locate the camshaft sprocket alignment mark in the 6 o'clock position. 6. Install the camshaft sprocket (2) and timing chain (3). 7. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks. Notice: Refer to Fastener Notice in Service Precautions. 8. Install the camshaft sprocket bolts. ^ Tighten the bolts to 35 Nm (26 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Chain > Component Information > Service and Repair > Page 4225 9. Install the oil pump. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Chain Tensioner > Component Information > Specifications Timing Chain Tensioner: Specifications Timing Chain Dampener Bolts ............................................................................................................. .................................................... 25 Nm (18 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Component Alignment Marks > Component Information > Locations Timing Component Alignment Marks: Locations Inspect for proper alignment of the camshaft and crankshaft sprocket timing marks (1, 2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Cover > Component Information > Specifications Timing Cover: Specifications Front Cover Bolts ................................................................................................................................. .................................................... 25 Nm (18 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Cover > Component Information > Specifications > Page 4235 Timing Cover: Service and Repair Engine Front Cover Replacement ^ Tools Required J 41476 Front and Rear Cover Alignment Tool (at crankshaft seal area) Removal Procedure 1. Remove the air conditioning (A/C) compressor and bracket. 2. Remove the water pump. 3. Remove the crankshaft balancer. 4. Remove the oil pan-to-front cover bolts. 5. Remove the front cover bolts. 6. Remove the front cover and gasket. 7. Discard the front cover gasket. 8. Clean and inspect the engine front cover. Refer to Engine Front Cover Cleaning and Inspection. Installation Procedure Important: ^ Do not reuse the crankshaft oil seal or front cover gasket. ^ Do not apply any type of sealant to the front cover gasket, unless specified. ^ The special tool in this procedure is used to properly center the front crankshaft front oil seal. ^ All gasket surfaces should be free of oil or other foreign material during assembly. ^ The crankshaft front oil seal MUST be centered in relation to the crankshaft. ^ An improperly aligned front cover may cause premature front oil seal wear and/or engine oil leaks. 1. Apply a 5 mm (0.2 inch) bead of sealant 20 mm (0.8 inch) long to the junction of the oil pan and the engine block. Refer to Sealers, Adhesives, and Lubricants for the correct part number. 2. Install the front cover gasket and cover. 3. Install the front cover bolts until snug. Do not over tighten. 4. Install the oil pan-to-front cover bolts until snug. Do not over tighten. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Cover > Component Information > Specifications > Page 4236 5. Install J 41476 to the front cover. 6. Align the tapered legs of J 41476 with the machined alignment surfaces on the front cover. Notice: Refer to Fastener Notice in Service Precautions. 7. Install the crankshaft balancer bolt until snug. Do NOT over tighten. 1. Tighten the oil pan to front cover bolts to 25 Nm (18 ft. lbs.). 2. Tighten the engine front cover bolts to 25 Nm (18 ft. lbs.). 8. Remove J 41476. 9. Install a NEW crankshaft front oil seal. 10. Install the water pump. 11. Install the A/C compressor and bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > Specifications Fuel Pressure: Specifications Fuel Pressure (Key ON, Engine OFF).................................................................................................. ..............................................385-425 kPa (55-62 psi) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal Fuel Pressure: Testing and Inspection Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 4243 Fuel Pressure: Testing and Inspection Fuel System Diagnosis FUEL SYSTEM DIAGNOSIS SYSTEM DESCRIPTION The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON. The fuel system is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions. The fuel tank stores the fuel supply. An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times. TEST Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 4244 Step 1 - Step 5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 4245 Step 6 - Step 13 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Idle Speed > System Information > Specifications Idle Speed: Specifications Information not supplied by the manufacturer. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: Customer Interest Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 4258 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: All Technical Service Bulletins Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 4264 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 05-08-111-009B > Jan > 06 > Body - Body Side Moldings Come loose Upper Side Moulding / Trim: All Technical Service Bulletins Body - Body Side Moldings Come loose Bulletin No.: 05-08-111-009B Date: January 10, 2006 ADVANCE SERVICE INFORMATION RESOLUTION Subject: Body Side Molding Loose (Replace Moldings) Models: 2006 Chevrolet TrailBlazer, TrailBlazer EXT Built Prior to VIN Breakpoints 66102647 (OKC) and 62131829 (Moraine) Supercede: This bulletin is being revised to change the Correction information. Please discard Corporate Bulletin Number 05-08-111-009A (Section 08 - Body and Accessories). Condition Some customers may comment that the body side moldings are coming loose. Cause There may be some primer overspray on the back of the molding, causing the tape to disengage. Correction Replace all of the body side moldings with paint to match moldings. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 05-08-111-009B > Jan > 06 > Body - Body Side Moldings Come loose > Page 4270 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 05-08-111-009B > Jan > 06 > Body - Body Side Moldings Come loose > Page 4276 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 4277 Air Filter Element: Service and Repair AIR CLEANER ELEMENT REPLACEMENT REMOVAL PROCEDURE 1. Remove the air cleaner outlet duct. 2. Disconnect the mass air flow (MAF) / intake air temperature (IAT) sensor electrical connector (1). 3. Remove the radiator support diagonal brace. 4. Loosen the 4 air cleaner cover retaining screws (1). 5. Remove the air cleaner housing cover (2). Lift and rotate the cover in order to remove the cover from the vehicle. 6. Remove the air filter element (6) and the MAF/IAT sensor (3) from the lower air cleaner housing/washer solvent tank assembly (4). 7. Separate the air filter element (6) from the MAF/IAT sensor (3). 8. Inspect the entire assembly for dust, debris, or water. Clean or replace as necessary. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 4278 1. Install the MAF/IAT sensor (3) to the air filter element (6). 2. Install the air filter element (6) and MAF/IAT sensor (3) to the lower air cleaner housing/washer solvent tank assembly (4). 3. Install the air cleaner cover (2) and secure with 4 retaining screws (1). NOTE: Refer to Fastener Notice. IMPORTANT: Ensure the air inlet duct (5) is properly positioned in the lower air cleaner housing/washer solvent tank assembly (4) before installing the air cleaner cover (2). Tighten the screws to 4 N.m (35 lb in). 4. Install the radiator support diagonal brace. 5. Connect the MAF/IAT sensor electrical connector (1). 6. Install the air cleaner outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure Fuel Pressure Release: Service and Repair Fuel Pressure Relief Procedure FUEL PRESSURE RELIEF PROCEDURE TOOLS REQUIRED J 34730-1A Fuel Pressure Gage 1. Disconnect the negative battery cable. 2. Install J 34730-1A. 3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure. 4. Open the valve on J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing. 5. Drain any fuel remaining in the gage into an approved container. 6. Once the system pressure is completely relieved, remove J 34730-1A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure > Page 4284 Fuel Pressure Release: Service and Repair Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications Ignition Cable: Specifications Spark Plug Wire Resistance................................................................................................................. ................................................397 - 1,337 ohms per ft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications > Page 4288 Ignition Cable: Testing and Inspection SPARK PLUG WIRE INSPECTION Spark plug wire integrity is vital for proper engine operation. A thorough inspection is necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions: 1. Correct routing of the spark plug wires - Incorrect routing may cause cross-firing. 2. Any signs of cracks or splits in the wires. 3. Inspect each boot for the following conditions: - Tearing - Piercing - Arcing - Carbon tracking - Corroded terminal If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or terminal, replace the wire and the component connected to the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications > Page 4289 Ignition Cable: Service and Repair SPARK PLUG WIRE REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield, if necessary. 2. Remove the spark plug wire from the spark plug. - Twist each spark plug 1/2 turn. - Pull only on the boot in order to remove the wire from each spark plug. 3. Remove the spark plug wire from the ignition coil. - Twist each spark plug boot 1/2 turn. - Pull only on the boot in order to remove the wires from the ignition coil. INSTALLATION PROCEDURE 1. Install the spark plug wire to the ignition coil. 2. Install the spark plug wire to the spark plug. 3. Inspect the wires for proper installation: - Push sideways on each boot in order to inspect the seating. - Reinstall any loose boot. 4. Install the intake manifold sight shield, if necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Spark Plug Gap Spark Plug: Specifications Spark Plug Gap Spark Plug Gap ................................................................................................................................... .................................................... 1.02 mm (0.040 in.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Spark Plug Gap > Page 4294 Spark Plug: Specifications Spark Plug Torque Spark Plug Torque ............................................................................................................................... ................................................... 15 Nm (11.0 lb. ft.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 4295 Spark Plug: Application and ID SPARK PLUG TYPE GM P/N ................................................................................................................................................ .............................................................. 12571164 AC P/N ................................................................................................................................................. .................................................................. 41-985 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 4296 Spark Plug: Testing and Inspection SPARK PLUG INSPECTION - Verify that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to Ignition System Specifications for the correct spark plug. - Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions: Spark plug fouling - Colder plug - Pre-ignition causing spark plug and/or engine damage - Hotter plug - Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1) - Test for a loose terminal post (1) by twisting and pulling the post. The terminal post should not move. - Inspect the insulator (2) for flashover or carbon tracking, or soot. This is caused by the electrical charge traveling across the insulator between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. - Inspect the spark plug recess are of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated will cause arcing to ground. - Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3,4). - Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3). An excessively wide electrode gap can prevent correct spark plug operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 4297 - Inspect for the correct spark plug torque. Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. - Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). - Inspect for a broken or worn side electrode (3). - Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. - A looses center electrode (4) reduces the spark intensity. - Inspect for bridged electrodes (3,4). Deposits on the electrodes (3,4) reduce or eliminates the gap. - Inspect for worn or missing platinum pads on the electrodes (3,4), if equipped. - Inspect for excessive fouling. - Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation. Visual Inspection Normal operation - Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives. - Carbon fouled - Dry, fluffy black carbon, or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors - Excessive fuel pressure - Restricted air filter element - Incorrect combustion - Reduced ignition system voltage output Weak ignition coils - Worn ignition wires - Incorrect spark plug gap - Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off. - Deposit fouling - Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark plug intensity. Most powdery deposits will not affect spark plug intensity unless they form into a glazing over the electrode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 4298 Spark Plug: Service and Repair SPARK PLUG REPLACEMENT REMOVAL PROCEDURE 1. Remove the spark plug wire. 2. Remove the washer solvent container to gain access to the #2 spark plug. 3. Loosen the spark plug 1-2 turns. 4. Brush or using compressed air, blow away any dirt from around the spark plug. 5. Remove the spark plug.If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 4299 1. Correctly position the spark plug washer. 2. Inspect the spark plug gap. Adjust the gap as needed. Spark plug gap: 1.524 mm (0.060 in) 3. Hand start the spark plug in the corresponding cylinder. 4. Tighten the spark plug. - For used heads, tighten the plug to 15 N.m (11 lb ft). - For NEW heads, tighten the plug to 20 N.m (15 lb ft). NOTE: Refer to Fastener Notice. 5. Install the spark plug wire. 6. If removed, install the washer solvent container. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Compression Check > System Information > Specifications Compression Check: Specifications No cylinder should read less than ............................................................................................................................................................ 690 kPa (100 psi). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Compression Check > System Information > Specifications > Page 4303 Compression Check: Testing and Inspection Engine Compression Test 1. Charge the battery if the battery is not fully charged. 2. Disable the ignition system. 3. Disable the fuel injection system. 4. Remove all spark plugs. 5. Turn the ignition to the ON position. 6. Depress the accelerator pedal to position the throttle plate wide open. 7. Start with the compression gage at zero and crank the engine through 4 compression strokes, 4 puffs. 8. Measure the compression for each cylinder. Record the readings. 9. If a cylinder has low compression, inject approximately 15 ml (1 tablespoon) of engine oil into the combustion chamber through the spark plug hole. Measure the compression again and record the reading. 10. The minimum compression in any 1 cylinder should not be less than 70 percent of the highest cylinder. No cylinder should read less than 690 kPa (100 psi). For example, if the highest pressure in any 1 cylinder is 1,035 kPa (150 psi), the lowest allowable pressure for any other cylinder would be 725 kPa (105 psi). (1,035 x 70% = 725) (150 x 70% = 105). ^ Normal - Compression builds up quickly and evenly to the specified compression for each cylinder. ^ Piston Rings Leaking - Compression is low on the first stroke. Compression builds up with the following strokes, but does not reach normal. Compression improves considerably when you add oil. ^ Valves Leaking - Compression is low on the first stroke. Compression usually does not build up on the following strokes. Compression does not improve much when you add oil. ^ If 2 adjacent cylinders have lower than normal compression, and injecting oil into the cylinders does not increase the compression, the cause may be a head gasket leaking between the cylinders. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Specifications Water Pump: Specifications Water Pump Bolt First Pass ............................................................................................................................................. .................................................... 15 N.m (11 lb ft) Final Pass ............................................................ .................................................................................................................................... 30 N.m (22 lb ft) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement Water Pump: Service and Repair Auxiliary Water Pump Replacement Water Pump Replacement - Auxiliary ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Partially drain the cooling system. 2. If equipped with a L6 engine, remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement. 3. If equipped with a V8 engine, remove the air conditioning accumulator. Refer to Accumulator Replacement. 4. Use J 38185 to reposition the front heater inlet hose clamp from the auxiliary heater water pump. 5. Remove the front heater inlet hose (1) from the auxiliary heater water pump. 6. Use J 38185 to reposition the top heater inlet hose clamp from the auxiliary heater water pump. 7. Remove the top heater inlet hose (2) from the auxiliary heater water pump. 8. Disconnect the auxiliary heater water pump electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4309 9. Remove the auxiliary heater water pump bracket retaining nuts. 10. Remove the auxiliary heater water pump from the vehicle. 11. Remove the clips from the auxiliary heater water pump bracket. 12. Remove the auxiliary heater water pump from the auxiliary heater water pump bracket. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4310 1. Install the auxiliary heater water pump to the auxiliary heater water pump bracket. 2. Install the auxiliary heater water pump retaining clips. 3. Install the auxiliary heater water pump to the vehicle. Notice: Refer to Fastener Notice in Service Precautions. 4. Install the auxiliary heater water pump bracket retaining. ^ Tighten the nuts to 9 Nm (80 inch lbs.). 5. Connect the auxiliary heater water pump electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4311 6. Install the top heater inlet hose (2) to the auxiliary heater water pump. 7. Use J 38185 to reposition the top heater inlet hose clamp. 8. Install the front heater inlet hose (1) to the auxiliary heater water pump. 9. Use J 38185 to reposition the front heater inlet hose clamp to the auxiliary heater water pump. 10. If equipped with a L6 engine, install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement. 11. If equipped with a V8 engine, install the air conditioning accumulator. Refer to Accumulator Replacement. 12. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4312 Water Pump: Service and Repair Water Pump Replacement Water Pump Replacement (LH6 and LS2) ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Drain the cooling system. 2. Loosen the air cleaner outlet duct clamps at the following locations: ^ Throttle body ^ Mass air flow (MAF)/intake air temperature (IAT) sensor 3. Remove the air cleaner outlet duct bolt and duct. 4. Remove the accessory drive belt tensioner. 5. Remove the cooing fan and shroud. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4313 6. Using the J 38185, reposition the inlet hose clamp at the water pump. 7. Remove the inlet hose from the water pump. 8. Using the J 38185, reposition the outlet hose clamp at the water pump. 9. Remove the outlet hose from the water pump. 10. Remove the auxiliary heater inlet and outlet hose/pipe nut. 11. Using the J 38185, reposition the throttle body hose clamp at the throttle body. 12. Remove the hose from the throttle body. 13. Using the J 38185, reposition the auxiliary heater inlet and outlet hose/pipe clamps at the water pump. 14. Remove the inlet and outlet hoses/pipes from the water pump. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4314 15. Remove the water pump bolts. 16. Remove the water pump and gaskets. 17. Discard the water pump gaskets. Installation Procedure Notice: Refer to Fastener Notice in Service Precautions. Important: All gasket surfaces are to be free of oil or other foreign material during assembly. 1. Install the water pump and NEW gaskets. 2. Install the water pump bolts. 1. On the initial pass, tighten the bolts to 15 Nm (11 ft. lbs.). 2. On the final pass, tighten the bolts to 30 Nm (22 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4315 3. Install the auxiliary heater inlet and outlet hose/pipe nut. ^ Tighten the nut to 10 Nm (89 inch lbs.). 4. Install the hose to the throttle body. 5. Using J 38185, position the throttle body hose clamp at the throttle body. 6. Install the inlet and outlet hoses/pipes to the water pump. 7. Using J 38185, position the auxiliary heater inlet and outlet hose/pipe clamps at the water pump. 8. Install the outlet hose to the water pump. 9. Using J 38185, position the outlet hose clamp at the water pump. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Engine > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4316 10. Install the inlet hose to the water pump. 11. Using J 38185, position the inlet hose clamp at the water pump. 12. Install the cooing fan and shroud. 13. Install the accessory drive belt tensioner. 14. Install the air cleaner outlet duct and bolt. ^ Tighten the bolt to 10 Nm (89 inch lbs.). 15. Tighten the air cleaner outlet duct clamps at the following locations: ^ Throttle body ^ MAF/IAT sensor ^ Tighten the clamps to 7 Nm (62 inch lbs.). 16. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Auxiliary Water Pump > Component Information > Diagrams > HVAC System - Manual Water Pump - Auxiliary (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Auxiliary Water Pump > Component Information > Diagrams > HVAC System - Manual > Page 4322 Water Pump - Auxiliary (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Cooling System Air Bleeder Pipe / Hose > Component Information > Service and Repair > Coolant Air Bleed Hose Replacement Cooling System Air Bleeder Pipe / Hose: Service and Repair Coolant Air Bleed Hose Replacement Coolant Air Bleed Hose Replacement Removal Procedure 1. Drain the cooling system, if necessary. 2. Reposition the coolant air bleed hose clamp at the coolant air bleed pipe. 3. Reposition the coolant air bleed hose clamp at the heater outlet hose. 4. Remove the coolant air bleed hose from the air bleed pipe and the heater hose. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Cooling System Air Bleeder Pipe / Hose > Component Information > Service and Repair > Coolant Air Bleed Hose Replacement > Page 4327 1. Install the coolant air bleed hose to the air bleed pipe and the heater hose. 2. Position the coolant air bleed hose clamp at the coolant air bleed pipe. 3. Position the coolant air bleed hose clamp at the heater outlet hose. 4. Fill the cooling system, if necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Cooling System Air Bleeder Pipe / Hose > Component Information > Service and Repair > Coolant Air Bleed Hose Replacement > Page 4328 Cooling System Air Bleeder Pipe / Hose: Service and Repair Coolant Air Bleed Pipe Assembly Replacement Coolant Air Bleed Pipe Assembly Replacement (5.3L and 6.0L Engines) Removal Procedure 1. Drain the cooling system, if necessary. 2. Remove the air cleaner resonator outlet duct. 3. Reposition the coolant air bleed hose clamp at the coolant air bleed pipe. 4. Remove the coolant air bleed hose from the coolant air bleed pipe. 5. Remove the coolant air bleed pipe bolts (309). 6. Remove the coolant air bleed pipe (307) with seals (308). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Cooling System Air Bleeder Pipe / Hose > Component Information > Service and Repair > Coolant Air Bleed Hose Replacement > Page 4329 7. Remove the coolant air bleed pipe cover bolts (312), if necessary. 8. Remove the coolant air bleed covers (313) with seals (308), if necessary. 9. Remove and discard the seals (308) from the coolant air bleed pipe and covers. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Cooling System Air Bleeder Pipe / Hose > Component Information > Service and Repair > Coolant Air Bleed Hose Replacement > Page 4330 Important: Position the gasket O-ring seal (308) onto the nipple portion of the pipe. 1. Install the seals (308) onto the coolant air bleed pipe and covers. 2. Install the coolant air bleed pipe (307) with seals (308). Notice: Refer to Fastener Notice in Service Precautions. 3. Install the coolant air bleed pipe bolts (309). ^ Tighten the bolts to 12 Nm (106 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Cooling System Air Bleeder Pipe / Hose > Component Information > Service and Repair > Coolant Air Bleed Hose Replacement > Page 4331 4. Install the coolant air bleed covers (313) with seals (308), if necessary. 5. Remove the coolant air bleed pipe cover bolts (312), if necessary. ^ Tighten the bolts to 12 Nm (106 inch lbs.). 6. Install the coolant air bleed hose to the coolant air bleed pipe. 7. Position the coolant air bleed hose clamp at the coolant air bleed pipe. 8. Fill the cooling system, if necessary. 9. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye Coolant: Technical Service Bulletins Cooling System - DEX-COOL(R) Coolant Leak Detection Dye Bulletin No.: 05-06-02-002B Date: January 18, 2008 INFORMATION Subject: DEX-COOL(R) Coolant - New Leak Detection Dye J 46366 - Replaces J 29545-6 Models: 1996-2008 GM Passenger Cars and Light/Medium Duty Trucks* (including Saturn) 1997-2008 Isuzu T-Series Medium Duty Tilt Cab Models Built in Janesville and Flint 1999-2008 Isuzu N-Series Medium Duty Commercial Models with 5.7L or 6.0L Gas Engine 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2008 Saab 9-7X *EXCLUDING 2006 and Prior Chevrolet Aveo, Epica, Optra, Vivant and Pontiac Matiz, Wave Supercede: This bulletin is being revised to include additional model years. Please discard Corporate Bulletin Number 05-06-02-002A (Section 06 - Engine/Propulsion System). Leak detection dye P/N 12378563 (J 29545-6) (in Canada P/N 88900915) may cause DEX-COOL(R) coolant to appear green in a black vessel making it appear to be conventional (green) coolant. This may cause a technician to add conventional coolant to a low DEX-COOL(R) system thus contaminating it. The green DEX-COOL(R) appearance is caused by the color of the leak detection dye which alters the color of the DEX-COOL(R) coolant. A new leak detection dye P/N 89022219 (J 46366) (in Canada P/N 89022220) has been released that does not alter the appearance of the DEX-COOL(R) coolant. When adding the new leak detection dye the color of the DEX-COOL(R) coolant will not change. For detecting leaks on any system that uses DEX-COOL(R) leak detection dye P/N 89022219 (in Canada P/N 89022220) should be used. The new leak detection dye can be used with both conventional and DEX-COOL(R) coolant. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 4336 Coolant: Technical Service Bulletins Cooling System - Coolant Recycling Information Bulletin No.: 00-06-02-006D Date: August 15, 2006 INFORMATION Subject: Engine Coolant Recycling and Warranty Information Models: 2007 and Prior GM Passenger Cars and Trucks (Including Saturn) 2007 and Prior HUMMER Vehicles 2005-2007 Saab 9-7X Attention: Please address this bulletin to the Warranty Claims Administrator and the Service Manager. Supercede: This bulletin is being revised to adjust the title and Include Warranty Information. Please discard Corporate Bulletin Number 00-06-02-006C (Section 06 - Engine/Propulsion System). Coolant Reimbursement Policy General Motors supports the use of recycled engine coolant for warranty repairs/service, providing a GM approved engine coolant recycling system is used. Recycled coolant will be reimbursed at the GMSPO dealer price for new coolant plus the appropriate mark-up. When coolant replacement is required during a warranty repair, it is crucial that only the relative amount of engine coolant concentrate be charged, not the total diluted volume. In other words: if you are using two gallons of pre-diluted (50:50) recycled engine coolant to service a vehicle, you may request reimbursement for one gallon of GM Goodwrench engine coolant concentrate at the dealer price plus the appropriate warranty parts handling allowance. Licensed Approved DEX-COOL(R) Providers Important: USE OF NON-APPROVED VIRGIN OR RECYCLED DEX-COOL(R) OR DEVIATIONS IN THE FORM OF ALTERNATE CHEMICALS OR ALTERATION OF EQUIPMENT, WILL VOID THE GM ENDORSEMENT, MAY DEGRADE COOLANT SYSTEM INTEGRITY AND PLACE THE COOLING SYSTEM WARRANTY UNDER JEOPARDY. Shown in Table 1 are the only current licensed and approved providers of DEX-COOL(R). Products that are advertised as "COMPATIBLE" or "RECOMMENDED" for use with DEX-COOL(R) have not been tested or approved by General Motors. Non-approved coolants may degrade the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 4337 coolant system integrity and will no longer be considered a 5 yr/150,000 mile (240,000 km) coolant. Coolant Removal Services/Recycling The tables include all coolant recycling processes currently approved by GM. Also included is a primary phone number and demographic information. Used DEX-COOL(R) can be combined with used conventional coolant (green) for recycling. Depending on the recycling service and/or equipment, it is then designated as a conventional 2 yr/30,000 mile (50,000 km) coolant or DEX-COOL(R) 5 yr/150,000 mile (240,000 km) coolant. Recycled coolants as designated in this bulletin may be used during the vehicle(s) warranty period. DEX-COOL(R) Recycling The DEX-COOL(R) recycling service listed in Table 2 has been approved for recycling waste engine coolants (DEX-COOL) or conventional) to DEX-COOL(R) with 5 yr/150,000 mile (240,000 km) usability. Recycling Fluid Technologies is the only licensed provider of Recycled DEX-COOL(R) meeting GM6277M specifications and utilizes GM approved inhibitor packages. This is currently a limited program being monitored by GM Service Operations which will be expanded as demand increases. Conventional (Green) Recycling Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 4338 Processes shown in the Table 3 are capable of recycling waste engine coolants (DEX-COOL(R) or conventional) to a conventional (green) coolant. Recycling conventional coolant can be accomplished at your facility by a technician using approved EQUIPMENT (listed by model number in Table 3), or by an approved coolant recycling SERVICE which may recycle the coolant at your facility or at an offsite operation. Refer to the table for GM approved coolant recyclers in either of these two categories. Should you decide to recycle the coolant yourself, strict adherence to the operating procedures is imperative. Use ONLY the inhibitor chemicals supplied by the respective (GM approved) recycling equipment manufacturer. Sealing Tablets Cooling System Sealing Tablets (Seal Tabs) should not be used as a regular maintenance item after servicing an engine cooling system. Discoloration of coolant can occur if too many seal tabs have been inserted into the cooling system. This can occur if seal tabs are repeatedly used over the service life of a vehicle. Where appropriate, seal tabs may be used if diagnostics fail to repair a small leak in the cooling system. When a condition appears in which seal tabs may be recommended, a specific bulletin will be released describing their proper usage. Water Quality The integrity of the coolant is dependent upon the quality of DEX-COOL(R) and water. DEX-COOL(R) is a product that has enhanced protection capability as well as an extended service interval. These enhanced properties may be jeopardized by combining DEX-COOL(R) with poor quality water. If you suspect the water in your area of being poor quality, it is recommended you use distilled or de-ionized water with DEX-COOL(R). "Pink" DEX-COOL(R) DEX-COOL(R) is orange in color to distinguish it from other coolants. Due to inconsistencies in the mixing of the dyes used with DEX-COOL(R), some batches may appear pink after time. The color shift from orange to pink does not affect the integrity of the coolant, and still maintains the 5 yr/150,000 mile (240,000 km) service interval. Back Service Only use DEX-COOL(R) if the vehicle was originally equipped with DEX-COOL(R). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant > Component Information > Technical Service Bulletins > Cooling System - DEX-COOL(R) Coolant Leak Detection Dye > Page 4339 Contamination Mixing conventional green coolant with DEX-COOL(R) will degrade the service interval from 5 yrs./150,000 miles (240,000 km) to 2 yrs./30,000 miles (50,000 km) if left in the contaminated condition. If contamination occurs, the cooling system must be flushed twice immediately and re-filled with a 50/50 mixture of DEX-COOL(R) and clean water in order to preserve the enhanced properties and extended service interval of DEX-COOL(R). After 5 years/150,000 miles (240,000 km) After 5 yrs/150,000 miles (240,000 km), the coolant should be changed, preferably using a coolant exchanger. If the vehicle was originally equipped with DEX-COOL(R) and has not had problems with contamination from non-DEX-COOL(R) coolants, then the service interval remains the same, and the coolant does not need to be changed for another 5 yrs/150,000 miles (240,000 km) Equipment (Coolant Exchangers) The preferred method of performing coolant replacement is to use a coolant exchanger. A coolant exchanger can replace virtually all of the old coolant with new coolant. Coolant exchangers can be used to perform coolant replacement without spillage, and facilitate easy waste collection. They can also be used to lower the coolant level in a vehicle to allow for less messy servicing of cooling system components. It is recommended that you use a coolant exchanger with a vacuum feature facilitates removing trapped air from the cooling system. This is a substantial time savings over repeatedly thermo cycling the vehicle and topping-off the radiator. The vacuum feature also allows venting of a hot system to relieve system pressure. Approved coolant exchangers are available through the GMDE (General Motors Dealer Equipment) program. For refilling a cooling system that has been partially or fully drained for repairs other than coolant replacement, the Vac-N-Fill Coolant Refill Tool (GE-47716) is recommended to facilitate removal of trapped air from the cooling system during refill. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant > Component Information > Specifications > Capacity Specifications Coolant: Capacity Specifications Cooling System ................................................................................................................................... .............................................. 12.2 quarts (11.6 liters) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant > Component Information > Specifications > Capacity Specifications > Page 4342 Coolant: Fluid Type Specifications ENGINE COOLANT The cooling system in your vehicle is filled with DEX-COOL engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 km), whichever occurs first, if you add only DEX-COOL extended life coolant. A 50/50 mixture of clean, drinkable water and DEX-COOL coolant will: ^ Give freezing protection down to -34°F (-37°C). ^ Give boiling protection up to 265°F (129°C). ^ Protect against rust and corrosion. ^ Help keep the proper engine temperature. ^ Let the warning lights and gages work as they should. NOTICE: Using coolant other than DEX-COOL may cause premature engine, heater core or radiator corrosion. In addition, the engine coolant may require changing sooner, at 30,000 miles (50 000 km) or 24 months, whichever occurs first. Any repairs would not be covered by your warranty. Always use DEX-COOL (silicate-free) coolant in your vehicle. WHAT TO USE Use a mixture of one-half clean, drinkable water and one-half DEX-COOL coolant which won't damage aluminum parts. If you use this coolant mixture, you don't need to add anything else. CAUTION: Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. Your vehicle's coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot but you would not get the overheat warning. Your engine could catch fire and you or others could be burned. Use a 50/50 mixture of clean, drinkable water and DEX-COOL coolant. NOTICE: If you use an improper coolant mixture, your engine could overheat and be badly damaged. The repair cost would not be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a year, check your cooling system. NOTICE: If you use the proper coolant, you do not have to add extra inhibitors or additives which claim to improve the system. These can be harmful. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant Outlet > Component Information > Service and Repair Coolant Outlet: Service and Repair Water Outlet Housing Replacement Removal Procedure 1. Disconnect the radiator inlet hose from the water outlet housing. 2. Remove the power steering pump bracket. 3. Remove the water outlet housing bolts. 4. Remove the water outlet housing and seal. Discard the old seal. Installation Procedure 1. Remove any burrs or foreign material from the sealing surface of the engine cylinder head and the water outlet housing. 2. Install a NEW seal and the water outlet housing. 3. Notice: Refer to Fastener Notice in Service Precautions. Install the water outlet housing bolts. ^ Tighten the water outlet bolts to 10 Nm (89 inch lbs.). 4. Connect the radiator inlet hose to the water outlet housing. 5. Install the power steering pump bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant Reservoir > Component Information > Service and Repair > Coolant Recovery Reservoir Replacement Coolant Reservoir: Service and Repair Coolant Recovery Reservoir Replacement Coolant Recovery Reservoir Replacement Removal Procedure 1. Remove the air cleaner assembly. 2. Remove the accumulator. 3. Remove the coolant hoses from the coolant recovery reservoir and plug the hoses and the coolant recovery reservoir outlets with suitable plugs (2). 4. Remove the nut and bolt securing the coolant recovery reservoir. 5. Remove the coolant recovery reservoir. Installation Procedure 1. Install the coolant recovery reservoir. 2. Notice: Refer to Fastener Notice in Service Precautions. Install the coolant recovery reservoir bolt. ^ Tighten the bolt to 12 Nm (106 inch lbs.). 3. Install the coolant recovery reservoir nut. ^ Tighten the nut to 10 Nm (89 inch lbs.). 4. Install the coolant hose to the coolant recovery reservoir (2). 5. Install the accumulator. 6. Install the air cleaner assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Coolant Reservoir > Component Information > Service and Repair > Coolant Recovery Reservoir Replacement > Page 4350 Coolant Reservoir: Service and Repair Radiator Vent Inlet Hose Replacement Radiator Vent Inlet Hose Replacement Removal Procedure 1. Partially drain the cooling system. 2. Remove the vent inlet hose from the radiator. 3. Remove the vent inlet hose from the surge tank. Installation Procedure 1. Install the vent inlet hose to the surge tank. 2. Install the vent inlet hose to the radiator. 3. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions Radiator Cooling Fan Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4356 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4357 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4358 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4359 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4360 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4361 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4362 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4363 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4364 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4365 Radiator Cooling Fan Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4366 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4367 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4368 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4369 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4370 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4371 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4372 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4373 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4374 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4375 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4376 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4377 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4378 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4379 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4380 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4381 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4382 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4383 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4384 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4385 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4386 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4387 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4388 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4389 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4390 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4391 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4392 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4393 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4394 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4395 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4396 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4397 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4398 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4399 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4400 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4401 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4402 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4403 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4404 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4405 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4406 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4407 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4408 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4409 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4410 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4411 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4412 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4413 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4414 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4415 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4416 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4417 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4418 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4419 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4420 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4421 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4422 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4423 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4424 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4425 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4426 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4427 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4428 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > Customer Interest: > 05-06-02-012B > Oct > 06 > Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 Radiator Cooling Fan Motor: Customer Interest Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 Bulletin No.: 05-06-02-012B Date: October 19, 2006 TECHNICAL Subject: Service Engine Soon (SES) or Check Engine Light On, DTC P0480/P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) Models: 2004-2006 Buick Rainier 2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT 2002-2006 GMC Envoy, Envoy XL 2004-2005 GMC Envoy XUV 2005-2006 GMC Envoy Denali, Envoy XL Denali 2002-2004 Oldsmobile Bravada 2005-2006 Saab 9-7X Supercede: This bulletin is being revised to add DTC P1484. Please discard Corporate Bulletin Number 05-06-02-012A (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set. Cause This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness. Correction Replace the engine cooling fan harness using the procedure listed below. Remove the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI. Place the cooling fan assembly on a bench. Disconnect the harness electrical connector from the cooling fan clutch. Remove the harness from the plastic guide while feeding the wires out of the slot. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > Customer Interest: > 05-06-02-012B > Oct > 06 > Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 > Page 4437 approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot. Feed the wires into the slot and install the harness to the plastic guide. Connect the harness electrical connector to the cooling fan clutch. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > Customer Interest: > 05-06-02-012B > Oct > 06 > Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 > Page 4438 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 05-06-02-012B > Oct > 06 > Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 Radiator Cooling Fan Motor: All Technical Service Bulletins Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 Bulletin No.: 05-06-02-012B Date: October 19, 2006 TECHNICAL Subject: Service Engine Soon (SES) or Check Engine Light On, DTC P0480/P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) Models: 2004-2006 Buick Rainier 2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT 2002-2006 GMC Envoy, Envoy XL 2004-2005 GMC Envoy XUV 2005-2006 GMC Envoy Denali, Envoy XL Denali 2002-2004 Oldsmobile Bravada 2005-2006 Saab 9-7X Supercede: This bulletin is being revised to add DTC P1484. Please discard Corporate Bulletin Number 05-06-02-012A (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set. Cause This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness. Correction Replace the engine cooling fan harness using the procedure listed below. Remove the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI. Place the cooling fan assembly on a bench. Disconnect the harness electrical connector from the cooling fan clutch. Remove the harness from the plastic guide while feeding the wires out of the slot. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 05-06-02-012B > Oct > 06 > Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 > Page 4444 approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot. Feed the wires into the slot and install the harness to the plastic guide. Connect the harness electrical connector to the cooling fan clutch. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 05-06-02-012B > Oct > 06 > Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484 > Page 4445 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > All Other Service Bulletins for Radiator Cooling Fan Motor: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: All Technical Service Bulletins A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > All Other Service Bulletins for Radiator Cooling Fan Motor: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 4451 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Technical Service Bulletins > All Other Service Bulletins for Radiator Cooling Fan Motor: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 4457 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions Radiator Cooling Fan Motor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4460 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4461 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4462 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4463 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4464 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4465 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4466 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4467 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4468 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4469 Radiator Cooling Fan Motor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4470 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4471 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4472 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4473 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4474 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4475 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4476 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4477 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4478 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4479 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4480 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4481 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4482 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4483 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4484 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4485 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4486 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4487 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4488 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4489 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4490 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4491 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4492 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4493 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4494 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4495 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4496 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4497 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4498 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4499 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4500 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4501 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4502 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4503 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4504 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4505 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4506 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4507 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4508 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4509 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4510 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4511 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4512 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4513 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4514 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4515 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4516 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4517 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4518 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4519 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4520 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4521 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4522 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4523 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4524 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4525 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4526 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4527 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4528 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4529 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4530 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4531 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor > Component Information > Diagrams > Diagram Information and Instructions > Page 4532 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Locations Radiator Cooling Fan Motor Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 4536 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 4537 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 4538 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions Radiator Cooling Fan Motor Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4541 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4542 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4543 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4544 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4545 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4546 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4547 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4548 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4549 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4550 Radiator Cooling Fan Motor Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4551 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4552 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4553 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4554 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4555 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4556 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4557 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4558 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4559 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4560 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4561 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4562 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4563 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4564 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4565 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4566 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4567 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4568 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4569 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4570 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4571 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4572 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4573 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4574 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4575 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4576 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4577 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4578 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4579 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4580 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4581 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4582 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4583 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4584 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4585 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4586 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4587 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4588 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4589 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4590 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4591 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4592 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4593 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4594 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4595 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4596 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4597 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4598 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4599 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4600 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4601 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4602 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4603 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4604 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4605 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4606 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4607 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4608 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4609 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4610 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4611 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4612 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4613 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Page 4614 Radiator Cooling Fan Motor Relay: Service and Repair Cooling Fan Relay Replacement ^ Tools Required J 43244 Relay Puller Pliers Removal Procedure 1. Remove the underhood electrical center cover. 2. Using the J 43244, remove the cooling fan relay (3). Installation Procedure Notice: Installation of the proper relay is critical. If an enhanced relay - equipped with a diode - is installed into a position requiring a standard relay - equipped without a diode - excessive current will damage any components associated with the relay or its associated circuits. 1. Install the cooling fan relay (3). 2. Install the underhood electrical center cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Fan Clutch > Component Information > Technical Service Bulletins > Cooling System - Electro-Viscous Fan Clutch Operation Fan Clutch: Technical Service Bulletins Cooling System - Electro-Viscous Fan Clutch Operation Bulletin No.: 06-06-02-003 Date: February 14, 2006 INFORMATION Subject: Operating Characteristics of the Electro-Viscous (EV) Fan Clutch and Diagnostic Tips for Cooling Fan Noise, Delayed Transmission Shifts and/or Engine Revving Too High Models: 2004-2006 Buick Rainier 2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT 2006 Chevrolet TrailBlazer SS 2002-2006 GMC Envoy, Envoy XL 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada 2005-2006 Saab 9-7X with 4.2L I-6, 5.3L V-8 or 6.0L V-8 Engine (VINs S, P, M, H - RPOs LL8, LM4, LH6, LS2) Date/VIN Breakpoints for Vehicles with New EV Fan Clutch Vehicles built after and including the Date or VIN Breakpoints listed in the table shown are equipped with the new electro-viscous (EV) fan clutch. Vehicles of any model year listed in "Models Affected" with labor code J3390 (claimed after June 8, 2005) with P/N 15293048 in Claim History may also be equipped with this new EV fan clutch. After having service for poor HVAC performance and/or engine cooling performance, some vehicles may exhibit fan noise, delayed transmission shifts, or the engine revving too high. These conditions may be caused by expected operating characteristics of the new design electro-viscous (EV) fan clutch. This new design EV fan clutch has been installed on production vehicles from the end of 2005 model year production (June 2005) and all 2006 model year vehicles. The new design EV fan clutch may also be present on vehicles serviced with this new part per Corporate Bulletin Number 04-01-38-019A or for other service related conditions. The updated design of the electro-viscous (EV) fan clutch helps improve A/C performance but may also produce some additional fan engagement noise. Important: Unless a specific issue is identified by proper SI diagnosis, do NOT replace a fan clutch for fan noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Fan Clutch > Component Information > Technical Service Bulletins > Cooling System - Electro-Viscous Fan Clutch Operation > Page 4619 Do NOT replace an EV fan unless a specific condition related to the EV fan is identified using SI diagnostics. If the fan has a condition that warrants replacement, a DTC should set and/or SI diagnostics should lead to the replacement of the fan clutch. If the fan is not operating at the proper speed/function, the appropriate diagnostic trouble code should set. Identify the root cause of the condition. Please make sure to do a thorough review of SI for proper diagnostics. Several Service Bulletins and Preliminary Information are available on SI regarding the EV fan. Refer to "Operating Characteristics" and "Diagnostic Tips" in this bulletin for additional information. Operating Characteristics of the Electro-Viscous (EV) Fan Clutch Changes to the EV fan clutch to improve the HVAC performance basically increase airflow in certain conditions. It is now possible during start up for the EV fan clutch to be engaged and match engine speed for about 1 minute depending on driving speeds (with lower speeds having a longer disengagement time) producing some noise/flare. The noise/flare will most likely be intermittent and can be dependent on the following conditions: ^ Fan clutch valve orientation, with check ball at 11:00 position as viewed from front of vehicle when the engine is stopped. ^ HVAC or powertrain cooling conditions when the vehicle is shut off. ^ Parking incline - vehicles parked nose up on a 16% or higher incline (such as vehicles coming off transport or parked on steep driveways) may have prolonged fan noise/flare until the fluid is pumped out of the working chamber of the fan. These conditions can occur in as little as ten minutes. Once the vehicle is not parked in these conditions, it should operate as expected. ^ Please note that if the vehicle is parked nose down with a 16% or more decline, the EV fan clutch may have a delayed engagement response similar to what is described in Corporate Bulletin Number 04-01-38-019A. Important: Do not replace EV fan clutches for these conditions listed above; they are expected vehicle characteristics. If the fan clutch is truly operating at a speed higher than intended, a DTC P0495 or P1484 should set. Additional codes are available for other conditions. Diagnostic Tips Depending on the vehicle year, the Tech 2(R) may allow some EV fan control using the special functions application of the Tech 2 (refer to the proper SI documentation). If this function or a fused jumper wire is being used to check EV fan response, there may be a delay in fan response (up to 2-3 minutes depending on conditions, please refer to SI diagnostics). The desired fan speed and actual fan speed data (on the Tech 2(R)) can be misleading. The desired fan speed is comprised of the maximum of multiple parameters (for example engine coolant temp, A/C pressure, etc.) and may not be the ruling desired fan speed parameter. The end result may be that the actual desired fan speed is lower than what is displayed. Additionally, the desired fan speed may be higher than the current engine speed. The fan is limited by the current engine RPM and will max out at about 3500 RPM under full manual fan engagement request along with a corresponding engine RPM speed. The 4.2L 1-6 (LL8) engine's desired and actual fan speeds will usually be closer to each other than the 5.3L V-8 (LM4 or LH6) or the 6.0L V-8 (LS2). Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cooling Fan > Fan Clutch > Component Information > Technical Service Bulletins > Page 4620 Fan Clutch: Service and Repair Fan Clutch Replacement Removal Procedure 1. Remove the cooling fan and shroud. 2. Remove the push-pin and release the fan clutch electrical connector from the fan shroud. 3. Remove the fan clutch from the fan shroud. 4. Remove the bolts retaining the fan blade to the fan clutch. 5. Separate the fan blade from the fan clutch. Installation Procedure 1. Assemble the fan blade to the fan clutch. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the 4 bolts to the fan blade. ^ Tighten the bolts to 27 Nm (20 ft. lbs.). 3. Install the fan clutch to the fan shroud. 4. Install the push-pin to the fan clutch electrical connector. 5. Install the cooling fan and shroud. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4630 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4631 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4632 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4633 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4639 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4640 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4641 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4642 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 4643 Engine Coolant Temperature (ECT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 4644 Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Turn OFF the ignition. NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 4. Lower the vehicle. 5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1). 6. Remove the ECT sensor. INSTALLATION PROCEDURE 1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. - Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 4645 2. Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the sensor to 20 N.m (15 lb ft). 3. Connect the ECT sensor electrical connector (1). 4. Refill the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Fan Shroud > Component Information > Service and Repair Fan Shroud: Service and Repair Cooling Fan and Shroud Replacement ^ Tools Required J 46406 Fan Clutch Remover and Installer Removal Procedure 1. Drain the cooling system. 2. Remove the air cleaner assembly. 3. Remove the air resonator assembly. 4. Remove the inlet radiator hose. 5. Remove the transmission oil cooler lines from the fan shroud. 6. Disconnect the fan clutch electrical connector. 7. Using J 46406 remove the fan clutch from the water pump. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Fan Shroud > Component Information > Service and Repair > Page 4649 8. Remove the mounting bolts from the upper fan shroud. 9. Lift and push the fan shroud inward to clear the filler neck on the radiator. 10. Remove the fan and the shroud. Installation Procedure 1. Install the fan and the shroud. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the mounting bolts to the upper fan shroud. ^ Tighten the bolts to 28 Nm (21 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Fan Shroud > Component Information > Service and Repair > Page 4650 3. Using J 46406 install the fan clutch to the water pump. 4. Connect the fan clutch electrical connector. 5. Install the transmission oil cooler lines to the fan shroud. 6. Install the inlet radiator hose. 7. Install the air resonator assembly. 8. Install the air cleaner assembly. 9. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Control Valve > Component Information > Diagrams > HVAC System - Manual Coolant Bypass Valve (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Control Valve > Component Information > Diagrams > HVAC System - Manual > Page 4655 Coolant Bypass Valve (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Control Valve > Component Information > Diagrams > Page 4656 Heater Control Valve: Service and Repair COOLANT BYPASS VALVE REPLACEMENT TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - J 38185 Hose Clamp Pliers REMOVAL PROCEDURE 1. Drain the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 2. Remove the coolant recovery reservoir. 3. Using the J 43181 , disconnect the inlet heater hose from the heater core. 1. Install the J 43181 to the quick connect on the outlet heater core hose (2). 2. Close the tool around the inlet heater core hose. 3. Firmly pull the tool into the quick connect end of the heater hose. 4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core. 4. Position the hose clamp at the engine outlet using J 38185. 5. Remove the heater inlet hose (4) from the engine block. 6. Remove the nut retaining the coolant bypass valve to the cowl. 7. Remove the vacuum hose from the coolant bypass valve. 8. Remove the coolant bypass valve. 9. Position the clamps at the coolant bypass valve. 10. Remove the heater inlet hoses form the coolant bypass valve. INSTALLATION PROCEDURE 1. Apply coolant to the end of the heater inlet hoses. 2. Install the heater inlet hose to the inlet hose fitting at the engine block. IMPORTANT: When installing a new heater inlet hose, place the clamps on the hose before installing the hose to the inlet hose fitting at the engine block. 3. Install the coolant bypass valve (6). 4. Install the nut retaining the coolant bypass valve to the cowl. Tighten the nut to 10 N.m (89 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 5. Install the vacuum hose to the coolant bypass valve. 6. Install the inlet heater hose to the engine block. 7. Position the inlet heater hose clamp at the engine block using J 38185. 8. Connect the heater inlet hose to the heater core. 9. Install the coolant recovery reservoir. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Control Valve > Component Information > Diagrams > Page 4657 IMPORTANT: Firmly push the quick connect onto the heater core pipe until you hear an audible click. 10. Fill the engine cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Technical Service Bulletins > Cooling System, A/C - Aluminum Heater Cores/Radiators Heater Core: Technical Service Bulletins Cooling System, A/C - Aluminum Heater Cores/Radiators INFORMATION Bulletin No.: 05-06-02-001A Date: July 16, 2008 Subject: Information On Aluminum Heater Core and/or Radiator Replacement Models: 2005 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2005 HUMMER H2 Supercede: This bulletin is being revised to update the Warranty Information. Please discard Corporate Bulletin Number 05-06-02-001 (Section 06 - Engine/Propulsion System). Important: 2004-05 Chevrolet Aveo (Pontiac Wave, Canada Only) does not use DEX-COOL(R). Refer to the flushing procedure explained later in this bulletin. The following information should be utilized when servicing aluminum heater core and/or radiators on repeat visits. A replacement may be necessary because erosion, corrosion, or insufficient inhibitor levels may cause damage to the heater core, radiator or water pump. A coolant check should be performed whenever a heater core, radiator, or water pump is replaced. The following procedures/ inspections should be done to verify proper coolant effectiveness. Caution: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if the radiator cap or surge tank cap is removed while the engine and radiator are still hot. Important: If the vehicle's coolant is low, drained out, or the customer has repeatedly added coolant or water to the system, then the system should be completely flushed using the procedure explained later in this bulletin. Technician Diagnosis ^ Verify coolant concentration. A 50% coolant/water solution ensures proper freeze and corrosion protection. Inhibitor levels cannot be easily measured in the field, but can be indirectly done by the measurement of coolant concentration. This must be done by using a Refractometer J 23688 (Fahrenheit scale) or J 26568 (centigrade scale), or equivalent, coolant tester. The Refractometer uses a minimal amount of coolant that can be taken from the coolant recovery reservoir, radiator or the engine block. Inexpensive gravity float testers (floating balls) will not completely analyze the coolant concentration fully and should not be used. The concentration levels should be between 50% and 65% coolant concentrate. This mixture will have a freeze point protection of -34 degrees Fahrenheit (-37 degrees Celsius). If the concentration is below 50%, the cooling system must be flushed. ^ Inspect the coolant flow restrictor if the vehicle is equipped with one. Refer to Service Information (SI) and/or the appropriate Service Manual for component location and condition for operation. ^ Verify that no electrolysis is present in the cooling system. This electrolysis test can be performed before or after the system has been repaired. Use a digital voltmeter set to 12 volts. Attach one test lead to the negative battery post and insert the other test lead into the radiator coolant, making sure the lead does not touch the filler neck or core. Any voltage reading over 0.3 volts indicates that stray current is finding its way into the coolant. Electrolysis is often an intermittent condition that occurs when a device or accessory that is mounted to the radiator is energized. This type of current could be caused from a poorly grounded cooling fan or some other accessory and can be verified by watching the volt meter and turning on and off various accessories or engage the starter motor. Before using one of the following flush procedures, the coolant recovery reservoir must be removed, drained, cleaned and reinstalled before refilling the system. Notice: ^ Using coolant other than DEX‐COOL(R) may cause premature engine, heater core or radiator corrosion. In addition, the engine coolant may require changing sooner, at 30,000 miles (50,000 km) or 24 months, whichever occurs first. Any repairs would not be covered by your warranty. Always use DEX‐COOL(R) (silicate free) coolant in your vehicle. ^ If you use an improper coolant mixture, your engine could overheat and be badly damaged. The repair cost would not be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Technical Service Bulletins > Cooling System, A/C - Aluminum Heater Cores/Radiators > Page 4662 Flushing Procedures using DEX-COOL(R) Important: The following procedure recommends refilling the system with DEX-COOL(R), P/N 12346290 (in Canada, use P/N 10953464), GM specification 6277M. This coolant is orange in color and has a service interval of 5 years or 240,000 km (150,000 mi). However, when used on vehicles built prior to the introduction of DEX-COOL(R), maintenance intervals will remain the same as specified in the Owner's Manual. ^ If available, use the approved cooling system flush and fill machine (available through the GM Dealer Equipment Program) following the manufacturer's operating instructions. ^ If approved cooling system flush and fill machine is not available, drain the coolant and dispose of properly following the draining procedures in the appropriate Service Manual. Refill the system using clear, drinkable water and run the vehicle until the thermostat opens. Repeat and run the vehicle three (3) times to totally remove the old coolant or until the drained coolant is almost clear. Once the system is completely flushed, refill the cooling system to a 50%-60% concentration with DEX‐COOL(R), P/N 12346290 (in Canada, use P/N 10953464), GM specification 6277M, following the refill procedures in the appropriate Service Manual. If a Service Manual is not available, fill half the capacity of the system with 100% DEX-COOL(R), P/N 12346290 (in Canada, use P/N 10953464), GM specification 6277M. Then slowly add clear, drinkable water (preferably distilled) to the system until the level of the coolant mixture has reached the base of the radiator neck. Wait two (2) minutes and reverify the coolant level. If necessary, add clean water to restore the coolant to the appropriate level. Once the system is refilled, reverify the coolant concentration using a Refractometer J 23688 (Fahrenheit scale) or J 26568 (centigrade scale) coolant tester, or equivalent. The concentration levels should be between 50% and 65%. Flushing Procedures using Conventional Silicated (Green Colored) Coolant Important: 2004-2005 Chevrolet Aveo (Pontiac Wave, Canada Only) does not use DEX‐COOL(R). The Aveo and Wave are filled with conventional, silicated engine coolant that is blue in color. Silicated coolants are typically green in color and are required to be drained, flushed and refilled every 30,000 miles (48,000 km). The Aveo and Wave are to be serviced with conventional, silicated coolant. Use P/N 12378560 (1 gal) (in Canada, use P/N 88862159 (1 L). Refer to the Owner's Manual or Service Information (SI) for further information on OEM coolant. Important: Do not mix the OEM orange colored DEX-COOL(R) coolant with green colored coolant when adding coolant to the system or when servicing the vehicle's cooling system. Mixing the orange and green colored coolants will produce a brown coolant which may be a customer dissatisfier and will not extend the service interval to that of DEX-COOL(R). Conventional silicated coolants offered by GM Service and Parts Operations are green in color. ^ If available, use the approved cooling system flush and fill machine (available through the GM Dealer Equipment Program) following the manufacturer's operating instructions. ^ If approved cooling systems flush and fill machine is not available, drain coolant and dispose of properly following the draining procedures in appropriate Service Manual. Refill the system using clear, drinkable water and run vehicle until thermostat opens. Repeat and run vehicle three (3) times to totally remove old coolant or until drained coolant is almost clear. Once the system is completely flushed, refill the cooling system to a 50%-60% concentration with a good quality ethylene glycol base engine coolant, P/N 12378560, 1 gal (in Canada, use P/N 88862159 1 L), conforming to GM specification 1825M, or recycled coolant conforming to GM specification 1825M, following the refill procedures in the appropriate Service Manual. If a Service Manual is not available, fill half the capacity of the system with 100% good quality ethylene glycol base (green colored) engine coolant, P/N 12378560 1 gal., (in Canada, use P/N 88862159 1 L) conforming to GM specification 1825M. Then slowly add clear, drinkable water (preferably distilled) to system until the level of the coolant mixture has reached the base of the radiator neck. Wait two (2) minutes and recheck coolant level. If necessary, add clean water to restore coolant to the appropriate level. Once the system is refilled, recheck the coolant concentration using a Refractometer J 23688 (Fahrenheit scale) or J 26568 (centigrade scale) coolant tester, or equivalent. Concentration levels should be between 50% and 65%. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Technical Service Bulletins > Cooling System, A/C - Aluminum Heater Cores/Radiators > Page 4663 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Service and Repair > Heater Core Heater Core: Service and Repair Heater Core HEATER CORE REPLACEMENT REMOVAL PROCEDURE 1. Remove the HVAC module assembly. 2. Remove the heater core access cover screws. 3. Remove the heater core access cover. 4. Remove the heater core (2) from the HVAC module assembly (1). INSTALLATION PROCEDURE 1. Install the heater core (2) to the HVAC module assembly (1). 2. Install the heater core access cover. 3. Install the heater core access cover screws. Tighten the screws to 1.9 N.m (17 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 4. Install the HVAC module assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Service and Repair > Heater Core > Page 4666 Heater Core: Service and Repair Heater Core - Auxiliary HEATER CORE REPLACEMENT - AUXILIARY REMOVAL PROCEDURE 1. Remove the HVAC module-auxiliary. 2. Remove the screws from heater core cover-auxiliary (3) from the HVAC module-auxiliary. 3. Remove the heater core cover-auxiliary (3). 4. Remove the HVAC module pass thru seal-auxiliary. 5. Remove the heater core-auxiliary (2) from the HVAC module-auxiliary. INSTALLATION PROCEDURE 1. Install the heater core-auxiliary (2) to the HVAC module-auxiliary. 2. Install the HVAC module pass thru seal-auxiliary. 3. Install the heater core access cover-auxiliary (3) to the HVAC module-auxiliary. 4. Install the screws to the heater core access cover-auxiliary (3). Tighten the screws to 2 N.m (18 lb in). NOTE: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Service and Repair > Heater Core > Page 4667 5. Install the HVAC module-auxiliary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Service and Repair > Heater Core > Page 4668 Heater Core: Service and Repair Heater Core Cover - Auxiliary HEATER CORE COVER REPLACEMENT - AUXILIARY REMOVAL PROCEDURE 1. Remove the right rear quarter trim panel. 2. Remove the screws from the heater core cover-auxiliary (3). 3. Remove the heater core cover-auxiliary (3). INSTALLATION PROCEDURE 1. Install the heater core cover-auxiliary (3). 2. Install the screws to the heater core cover-auxiliary. Tighten the screws to 2 N.m (18 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 3. Install the right rear quarter trim panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) Heater Hose: Service and Repair Heater Hose - Inlet (Front System Only) HEATER HOSE REPLACEMENT - INLET (FRONT SYSTEM ONLY) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - GE-47622 Hose Clamp Pliers REMOVAL PROCEDURE 1. Drain the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 2. Using the J 43181 , disconnect the inlet heater hose (2) from the heater core inlet tube. 1. Install the J 43181 to the quick connect on the outlet heater core hose (2). 2. Close the tool around the inlet heater core hose. 3. Firmly pull the tool into the quick connect end of the heater hose. 4. Firmly grasp the heater hose (2). Pull the heater hose forward in order to disengage the hose from the heater core. 3. Position the inlet heater hose clamp (1) at the engine block using GE-47622 . 4. Remove the heater inlet hose (2) from the inlet hose fitting at the engine block. 5. Remove the heater inlet hose. INSTALLATION PROCEDURE 1. Apply coolant to the end of the heater inlet hose. 2. Install the heater inlet hose (2) to the inlet hose fitting at the engine block. IMPORTANT: When installing a new heater inlet hose, place the clamps on the hose before installing the hose to the inlet hose fitting at the engine block. 3. Position the inlet heater hose clamp (1) at the engine block using GE-47622 . 4. Install the quick connect end of the outlet heater core hose (2) to the heater core. 5. Fill the engine cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 4673 Heater Hose: Service and Repair Heater Hose - Inlet (Auxiliary System) HEATER HOSE REPLACEMENT - INLET (AUXILIARY SYSTEM) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - J 38185 Hose Clamp Pliers REMOVAL PROCEDURE 1. Drain the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 2. Remove the coolant recovery reservoir. 3. Using the J 43181 disconnect the inlet heater hose (2) from the heater core inlet tube. 1. Install the J 43181 to the quick connect on the outlet heater core hose (2). 2. Close the tool around the inlet heater core hose. 3. Firmly pull the tool into the quick connect end of the heater hose. 4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core. 4. Reposition the hose clamp at the engine outlet using J 38185. 5. Remove the heater inlet hose (4) from the engine block. 6. Remove the nut retaining the coolant bypass valve to the cowl. 7. Remove the heater inlet hose. INSTALLATION PROCEDURE 1. Apply coolant to the end of the heater inlet hoses. 2. Install the heater inlet hose to the inlet hose fitting at the engine block. IMPORTANT: When installing a new heater inlet hose, place the clamps on the hose before installing the hose to the inlet hose fitting at the engine block. 3. Install the nut retaining the coolant bypass valve to the cowl. Tighten the nut to 10 N.m(89 lb in). NOTE: Refer to Fastener Notice in Service Precautions. 4. Install the inlet heater hose to the engine block. 5. Reposition the inlet heater hose clamp at the engine block using J 38185. 6. Install the quick connect end of the inlet heater core hose to the heater core. 7. Install the coolant recovery reservoir. 8. Fill the engine cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 4674 Heater Hose: Service and Repair Heater Hose - Outlet (Short Wheel Base) HEATER HOSE REPLACEMENT - OUTLET (SHORT WHEEL BASE) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - J 38185 Hose Clamp Pliers REMOVAL PROCEDURE 1. Drain the cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2). 2. Remove the transmission. 3. Remove the generator. 4. Using the J 43181 disconnect the outlet hose from the heater core outlet tube (1). 1. Install the J 43181 to the outlet heater core hose. 2. Close the tool around the outlet heater core hose. 3. Firmly pull the tool into the quick connect end of the heater hose. 4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core. 5. Remove the heater outlet hose (3) from the heater core (1). 6. Position the outlet heater hose clamp (6) at the water pump using J 38185. 7. Remove the heater outlet hose (7) from the outlet hose fitting. 8. Remove the heater outlet hose. INSTALLATION PROCEDURE 1. Install the outlet heater hose. 2. Install the heater outlet hose (7) to the outlet hose fitting. 3. Position the outlet heater hose clamp (6) at the outlet hose fitting using J 38185. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 4675 4. Install the heater outlet hose (3) to the heater core (1). 5. Firmly push the quick connect onto the heater core hose until you hear an audible click. 6. Install the transmission. 7. Install the generator. 8. Fill the cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 4676 Heater Hose: Service and Repair Heater Hose - Outlet (Long Wheel Base) HEATER HOSE REPLACEMENT - OUTLET (LONG WHEEL BASE) TOOLS REQUIRED - J 43181 Heater Line Quick Connect Release Tool - J 38185 Hose Clamp Pliers REMOVAL PROCEDURE 1. Remove the coolant bypass valve. 2. Remove the transmission. 3. Remove the heater outlet hose (3) from the heater core (1). 4. Position the outlet heater hose clamp (6) at the water pump using J 38185. 5. Remove the heater outlet hose (7) from the outlet hose fitting. 6. Remove the heater outlet hose. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 4677 1. Install the outlet heater hose. 2. Install the heater outlet hose (7) to the outlet hose fitting. 3. Position the outlet heater hose clamp (6) at the outlet hose fitting using J 38185. 4. Install the heater outlet hose (3) to the heater core (1). 5. Firmly push the quick connect onto the heater core hose until you hear an audible click. 6. Install the transmission. 7. Install the coolant bypass valve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 4678 Heater Hose: Service and Repair Heater and Air Conditioning (A/C) Pipe/Repair - Auxiliary HEATER AND AIR CONDITIONING (A/C) PIPE REPLACEMENT/REPAIR - AUXILIARY TOOLS REQUIRED J 41425 A/C Line Repair Kit Do not service the rear A/C or heater lines as a complete unit. Service the rear A/C or heater lines as a sectional repair. Replacement lines can be obtained through GMSPO. Use the J 41425 when any of the following actions damage the rear A/C or heater lines: Rub-through - Collision damage - Leakage in the system MINIMUM TUBE LENGTH REQUIRED TABLE IMPORTANT: When sectioning the rear A/C or heater lines, ensure that the correct minimum length remains in the straight part of the line on both sides of the splice. Follow the Straight Line Repair procedure in order to repair line damage in a straight section of line. Follow the Line Sectioning Repair procedure in order to repair any damage in a bend area. Do not repair the rear A/C or heater lines in a bend area, replace the lines. Maintaining the original line shape will prevent vibrations and rub-through. STRAIGHT LINE REPAIR 1. Recover the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. 2. Drain the coolant, if repairing the heater lines. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 3. Raise and support the vehicle. Refer to Vehicle Lifting. 4. Locate the area that requires repair. 5. Obtain a length of replacement line to make the repair. 6. Use a tubing cutter in order to cut and remove the section of damaged line. 7. Use a tubing cutter in order to cut the replacement line to length. IMPORTANT: The length of the replacement line must be the same as the section being replaced. 8. Use the cleaning pad from the J 41425 in order to clean any burrs or grease from the line ends. Be sure to clean at least 19 mm (0.75 in) from the line splice area. 9. Use the LOK prep sealant in order to prep the line ends. 10. Apply one drop of the J 41425-3 sealing compound to the outside of each end of the line. 11. Insert the line ends into the LOK fitting. 12. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines. 13. Install the correct LOK fitting jaws into the J 41425-1 tool. 14. Install the J 41425-1 tool over the LOK connectors.Verify that the LOK connector ends are positioned in the counter bores of the jaws. 15. Tighten the forcing screw of the J 41425-1 tool.When fully seated, the LOK connector collars will bottom out on the center shoulder of the LOK fitting. IMPORTANT: Hold the J 41425-1 tool body with a 3/8" breaker bar. 16. Loosen the forcing screw and remove the J 41425-1 tool from the repaired line. 17. Repeat Step 8 through Step 16 to complete the line splice. 18. Verify that the LOK fittings are correctly installed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Heater Hose > Component Information > Service and Repair > Heater Hose - Inlet (Front System Only) > Page 4679 19. Lower the vehicle. 20. Refill the coolant, if drained. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 21. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. LINE SECTIONING REPAIR 1. Recover the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. 2. Drain the coolant, if repairing the heater lines. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 3. Raise and support the vehicle. Refer to Vehicle Lifting. 4. Obtain a new A/C or heater line for sectioning. 5. Scribe a mark on the line that will be sectioned. IMPORTANT: Stagger the splices if repairing more than one line. 6. Use a tubing cutter in order to cut the line or lines being replaced. 7. Remove the section of line being replaced from the vehicle. 8. Install the replacement line to the vehicle. IMPORTANT: The length of the replacement line must be the same as the line being replaced. 9. Use a tubing cutter in order to cut the replacement line to length. 10. Use the cleaning pad from the J 41425 in order to clean any burrs or grease. Be sure to clean at least 19 mm (0.75 in) from the line splice area. 11. Use the LOK prep sealant in order to prep the line ends. 12. Apply one drop of the J 41425-3 sealing compound to the outside of each line end. 13. Insert the line ends into the LOK fitting. 14. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines. 15. Install the correct LOK fitting jaws into the J 41425-1 tool. 16. Install the J 41425-1 tool over the LOK connectors.Verify that the LOK connector ends are positioned in the counter bores of the jaws. 17. Hold the tool body with a 3/8" breaker bar. Turn the forcing screw until both of the connector collars bottom on the center shoulder of the LOK fitting. 18. Loosen the forcing screw. Remove the tool from the repaired line. 19. Verify that the LOK fitting is correctly installed. 20. Lower the vehicle. 21. Refill the coolant, if drained. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 22. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator > Component Information > Technical Service Bulletins > Cooling System, A/C - Aluminum Heater Cores/Radiators Radiator: Technical Service Bulletins Cooling System, A/C - Aluminum Heater Cores/Radiators INFORMATION Bulletin No.: 05-06-02-001A Date: July 16, 2008 Subject: Information On Aluminum Heater Core and/or Radiator Replacement Models: 2005 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2003-2005 HUMMER H2 Supercede: This bulletin is being revised to update the Warranty Information. Please discard Corporate Bulletin Number 05-06-02-001 (Section 06 - Engine/Propulsion System). Important: 2004-05 Chevrolet Aveo (Pontiac Wave, Canada Only) does not use DEX-COOL(R). Refer to the flushing procedure explained later in this bulletin. The following information should be utilized when servicing aluminum heater core and/or radiators on repeat visits. A replacement may be necessary because erosion, corrosion, or insufficient inhibitor levels may cause damage to the heater core, radiator or water pump. A coolant check should be performed whenever a heater core, radiator, or water pump is replaced. The following procedures/ inspections should be done to verify proper coolant effectiveness. Caution: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if the radiator cap or surge tank cap is removed while the engine and radiator are still hot. Important: If the vehicle's coolant is low, drained out, or the customer has repeatedly added coolant or water to the system, then the system should be completely flushed using the procedure explained later in this bulletin. Technician Diagnosis ^ Verify coolant concentration. A 50% coolant/water solution ensures proper freeze and corrosion protection. Inhibitor levels cannot be easily measured in the field, but can be indirectly done by the measurement of coolant concentration. This must be done by using a Refractometer J 23688 (Fahrenheit scale) or J 26568 (centigrade scale), or equivalent, coolant tester. The Refractometer uses a minimal amount of coolant that can be taken from the coolant recovery reservoir, radiator or the engine block. Inexpensive gravity float testers (floating balls) will not completely analyze the coolant concentration fully and should not be used. The concentration levels should be between 50% and 65% coolant concentrate. This mixture will have a freeze point protection of -34 degrees Fahrenheit (-37 degrees Celsius). If the concentration is below 50%, the cooling system must be flushed. ^ Inspect the coolant flow restrictor if the vehicle is equipped with one. Refer to Service Information (SI) and/or the appropriate Service Manual for component location and condition for operation. ^ Verify that no electrolysis is present in the cooling system. This electrolysis test can be performed before or after the system has been repaired. Use a digital voltmeter set to 12 volts. Attach one test lead to the negative battery post and insert the other test lead into the radiator coolant, making sure the lead does not touch the filler neck or core. Any voltage reading over 0.3 volts indicates that stray current is finding its way into the coolant. Electrolysis is often an intermittent condition that occurs when a device or accessory that is mounted to the radiator is energized. This type of current could be caused from a poorly grounded cooling fan or some other accessory and can be verified by watching the volt meter and turning on and off various accessories or engage the starter motor. Before using one of the following flush procedures, the coolant recovery reservoir must be removed, drained, cleaned and reinstalled before refilling the system. Notice: ^ Using coolant other than DEX‐COOL(R) may cause premature engine, heater core or radiator corrosion. In addition, the engine coolant may require changing sooner, at 30,000 miles (50,000 km) or 24 months, whichever occurs first. Any repairs would not be covered by your warranty. Always use DEX‐COOL(R) (silicate free) coolant in your vehicle. ^ If you use an improper coolant mixture, your engine could overheat and be badly damaged. The repair cost would not be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator > Component Information > Technical Service Bulletins > Cooling System, A/C - Aluminum Heater Cores/Radiators > Page 4684 Flushing Procedures using DEX-COOL(R) Important: The following procedure recommends refilling the system with DEX-COOL(R), P/N 12346290 (in Canada, use P/N 10953464), GM specification 6277M. This coolant is orange in color and has a service interval of 5 years or 240,000 km (150,000 mi). However, when used on vehicles built prior to the introduction of DEX-COOL(R), maintenance intervals will remain the same as specified in the Owner's Manual. ^ If available, use the approved cooling system flush and fill machine (available through the GM Dealer Equipment Program) following the manufacturer's operating instructions. ^ If approved cooling system flush and fill machine is not available, drain the coolant and dispose of properly following the draining procedures in the appropriate Service Manual. Refill the system using clear, drinkable water and run the vehicle until the thermostat opens. Repeat and run the vehicle three (3) times to totally remove the old coolant or until the drained coolant is almost clear. Once the system is completely flushed, refill the cooling system to a 50%-60% concentration with DEX‐COOL(R), P/N 12346290 (in Canada, use P/N 10953464), GM specification 6277M, following the refill procedures in the appropriate Service Manual. If a Service Manual is not available, fill half the capacity of the system with 100% DEX-COOL(R), P/N 12346290 (in Canada, use P/N 10953464), GM specification 6277M. Then slowly add clear, drinkable water (preferably distilled) to the system until the level of the coolant mixture has reached the base of the radiator neck. Wait two (2) minutes and reverify the coolant level. If necessary, add clean water to restore the coolant to the appropriate level. Once the system is refilled, reverify the coolant concentration using a Refractometer J 23688 (Fahrenheit scale) or J 26568 (centigrade scale) coolant tester, or equivalent. The concentration levels should be between 50% and 65%. Flushing Procedures using Conventional Silicated (Green Colored) Coolant Important: 2004-2005 Chevrolet Aveo (Pontiac Wave, Canada Only) does not use DEX‐COOL(R). The Aveo and Wave are filled with conventional, silicated engine coolant that is blue in color. Silicated coolants are typically green in color and are required to be drained, flushed and refilled every 30,000 miles (48,000 km). The Aveo and Wave are to be serviced with conventional, silicated coolant. Use P/N 12378560 (1 gal) (in Canada, use P/N 88862159 (1 L). Refer to the Owner's Manual or Service Information (SI) for further information on OEM coolant. Important: Do not mix the OEM orange colored DEX-COOL(R) coolant with green colored coolant when adding coolant to the system or when servicing the vehicle's cooling system. Mixing the orange and green colored coolants will produce a brown coolant which may be a customer dissatisfier and will not extend the service interval to that of DEX-COOL(R). Conventional silicated coolants offered by GM Service and Parts Operations are green in color. ^ If available, use the approved cooling system flush and fill machine (available through the GM Dealer Equipment Program) following the manufacturer's operating instructions. ^ If approved cooling systems flush and fill machine is not available, drain coolant and dispose of properly following the draining procedures in appropriate Service Manual. Refill the system using clear, drinkable water and run vehicle until thermostat opens. Repeat and run vehicle three (3) times to totally remove old coolant or until drained coolant is almost clear. Once the system is completely flushed, refill the cooling system to a 50%-60% concentration with a good quality ethylene glycol base engine coolant, P/N 12378560, 1 gal (in Canada, use P/N 88862159 1 L), conforming to GM specification 1825M, or recycled coolant conforming to GM specification 1825M, following the refill procedures in the appropriate Service Manual. If a Service Manual is not available, fill half the capacity of the system with 100% good quality ethylene glycol base (green colored) engine coolant, P/N 12378560 1 gal., (in Canada, use P/N 88862159 1 L) conforming to GM specification 1825M. Then slowly add clear, drinkable water (preferably distilled) to system until the level of the coolant mixture has reached the base of the radiator neck. Wait two (2) minutes and recheck coolant level. If necessary, add clean water to restore coolant to the appropriate level. Once the system is refilled, recheck the coolant concentration using a Refractometer J 23688 (Fahrenheit scale) or J 26568 (centigrade scale) coolant tester, or equivalent. Concentration levels should be between 50% and 65%. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator > Component Information > Technical Service Bulletins > Cooling System, A/C - Aluminum Heater Cores/Radiators > Page 4685 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator > Component Information > Technical Service Bulletins > Page 4686 Radiator: Service and Repair Radiator Replacement (LH6, LS2) ^ Tools Required J 41240 Fan Clutch Remover and Installer - J 38185 Hose Clamp Pliers Removal Procedure 1. Drain the coolant from the radiator. 2. Remove the lower radiator support shield, if equipped. 3. Remove the transmission cooler lines from the radiator. 4. Reposition the outlet radiator hose clamp using J 38185. 5. Remove the outlet radiator hose (1) from the radiator. 6. Lower the vehicle. 7. Reposition the inlet radiator hose clamp using J 38185. 8. Remove the inlet radiator hose from the radiator. 9. Remove the cooling fan and shroud. 10. Remove the air inlet grille. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator > Component Information > Technical Service Bulletins > Page 4687 11. Remove the coolant recovery line from the radiator. 12. Remove the upper radiator to condenser bolts. 13. Lift upward on the condenser to remove from the radiator retaining tab. 14. Remove the radiator. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator > Component Information > Technical Service Bulletins > Page 4688 1. Install the radiator. 2. Install the condenser to the radiator retaining tab. Notice: Refer to Fastener Notice in Service Precautions. 3. Install the bolts retaining the condenser to the radiator. ^ Tighten the bolts to 28 Nm (21 ft. lbs.). 4. Install the coolant recovery line to the radiator. 5. Install the air inlet grille. 6. Install the cooling fan and shroud. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator > Component Information > Technical Service Bulletins > Page 4689 7. Install the inlet radiator hose to the radiator. 8. Reposition the inlet radiator hose clamp using J 38185. 9. Raise the vehicle. 10. Install the outlet radiator hose (1) to the radiator. 11. Reposition the outlet radiator hose clamp (1) using J 38185. 12. Connect the transmission cooler lines to the radiator. 13. Install the lower radiator support shield, if equipped. 14. Lower the vehicle. 15. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Cap > Component Information > Testing and Inspection Radiator Cap: Testing and Inspection Pressure Cap Testing ^ Tools required J 24460-01 Cooling System Pressure Tester - J 42401 Radiator Cap / Surge Tank Test Adapter Pressure Cap Testing Caution: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot. 1. Remove the pressure cap. 2. Wash the pressure cap sealing surface with water. 3. Use the J 24460-01 (1) with J 42401 (2) in order to test the pressure cap. 4. Test the pressure cap for the following conditions: ^ Pressure release when the J 24460-01 exceeds the pressure rating of the pressure cap. ^ Maintain the rated pressure for at least 10 seconds.Note the rate of pressure loss. 5. Replace the pressure cap under the following conditions: ^ The pressure cap does not release pressure which exceeds the rated pressure of the cap. ^ The pressure cap does not hold the rated pressure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement Radiator Hose: Service and Repair Radiator Inlet Hose Replacement Radiator Hose Replacement - Inlet (LH6, LS2) ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Drain the cooling system. 2. Remove the air intake resonator. 3. Using J 38185 reposition the radiator inlet hose clamp (1) from the engine. 4. Remove the outlet hose from the engine. 5. Using J 38185 reposition the radiator inlet hose clamp (2) from the radiator. 6. Remove the radiator outlet hose from the radiator. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement > Page 4697 1. Install the inlet hose to the radiator. 2. Using J 38185 reposition the radiator inlet hose clamp to the radiator. 3. Install the inlet hose to the engine. 4. Using J 38185 reposition the radiator inlet hose clamp to the engine. 5. Install the air intake resonator. 6. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement > Page 4698 Radiator Hose: Service and Repair Radiator Outlet Hose Replacement Radiator Hose Replacement - Outlet (LH6, LS2) ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Drain the cooling system. 2. Using J 38185 reposition the radiator outlet hose clamp (3). 3. Remove the radiator outlet hose (2) from the radiator. 4. Using J 38185 reposition the radiator outlet hose clamp. 5. Remove the radiator outlet hose from the engine (5). 6. Remove the radiator outlet hose. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Radiator Hose > Component Information > Service and Repair > Radiator Inlet Hose Replacement > Page 4699 1. Install the radiator outlet hose to the engine (5). 2. Using J 38185 reposition the radiator outlet hose clamp (3). 3. Install the radiator outlet hose (2) to the radiator (1). 4. Using J 38185 reposition the radiator outlet hose clamp (3). 5. Lower the vehicle. 6. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Auxiliary Water Pump Relay > Component Information > Diagrams > HVAC System - Manual Auxiliary Water Pump Relay 1 (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Auxiliary Water Pump Relay > Component Information > Diagrams > HVAC System - Manual > Page 4705 Auxiliary Water Pump Relay 1 (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions Radiator Cooling Fan Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4710 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4711 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4712 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4713 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4714 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4715 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4716 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4717 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4718 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4719 Radiator Cooling Fan Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4720 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4721 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4722 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4723 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4724 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4725 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4726 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4727 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4728 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4729 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4730 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4731 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4732 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4733 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4734 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4735 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4736 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4737 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4738 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4739 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4740 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4741 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4742 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4743 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4744 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4745 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4746 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4747 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4748 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4749 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4750 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4751 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4752 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4753 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4754 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4755 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4756 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4757 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4758 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4759 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4760 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4761 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4762 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4763 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4764 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4765 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4766 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4767 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4768 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4769 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4770 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4771 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4772 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4773 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4774 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4775 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4776 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4777 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4778 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4779 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4780 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4781 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4782 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations Radiator Cooling Fan Motor Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 4786 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 4787 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Locations > Page 4788 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions Radiator Cooling Fan Motor Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4791 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4792 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4793 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4794 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4795 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4796 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4797 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4798 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4799 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4800 Radiator Cooling Fan Motor Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4801 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4802 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4803 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4804 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4805 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4806 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4807 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4808 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4809 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4810 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4811 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4812 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4813 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4814 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4815 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4816 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4817 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4818 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4819 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4820 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4821 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4822 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4823 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4824 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4825 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4826 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4827 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4828 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4829 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4830 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4831 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4832 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4833 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4834 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4835 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4836 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4837 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4838 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4839 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4840 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4841 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4842 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4843 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4844 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4845 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4846 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4847 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4848 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4849 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4850 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4851 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4852 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4853 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4854 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4855 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4856 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4857 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4858 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4859 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4860 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4861 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4862 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 4863 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Diagrams > Page 4864 Radiator Cooling Fan Motor Relay: Service and Repair Cooling Fan Relay Replacement ^ Tools Required J 43244 Relay Puller Pliers Removal Procedure 1. Remove the underhood electrical center cover. 2. Using the J 43244, remove the cooling fan relay (3). Installation Procedure Notice: Installation of the proper relay is critical. If an enhanced relay - equipped with a diode - is installed into a position requiring a standard relay - equipped without a diode - excessive current will damage any components associated with the relay or its associated circuits. 1. Install the cooling fan relay (3). 2. Install the underhood electrical center cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4875 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4876 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4877 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4878 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4884 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4885 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4886 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 4887 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 4888 Engine Coolant Temperature (ECT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 4889 Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Turn OFF the ignition. NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 4. Lower the vehicle. 5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1). 6. Remove the ECT sensor. INSTALLATION PROCEDURE 1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. - Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 4890 2. Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the sensor to 20 N.m (15 lb ft). 3. Connect the ECT sensor electrical connector (1). 4. Refill the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Thermostat, Engine Cooling > Component Information > Specifications Thermostat: Specifications Thermostat operating Temperature ................................................................................................................................ 87° C (188° F) and 97° C (206° F). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Thermostat, Engine Cooling > Component Information > Specifications > Page 4894 Thermostat: Service and Repair Thermostat Replacement (5.3L and 6.0L Engines) Removal Procedure Important: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly. 1. Remove the radiator outlet hose. 2. Remove the water pump inlet bolts. 3. Remove the water pump inlet and thermostat from the water pump. Installation Procedure 1. Install the thermostat and thermostat housing to the water pump. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the thermostat housing bolts. ^ Tighten the bolts to 15 Nm (11 ft. lbs.). 3. Install the radiator outlet hose. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Specifications Water Pump: Specifications Water Pump Bolt First Pass ............................................................................................................................................. .................................................... 15 N.m (11 lb ft) Final Pass ............................................................ .................................................................................................................................... 30 N.m (22 lb ft) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement Water Pump: Service and Repair Auxiliary Water Pump Replacement Water Pump Replacement - Auxiliary ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Partially drain the cooling system. 2. If equipped with a L6 engine, remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement. 3. If equipped with a V8 engine, remove the air conditioning accumulator. Refer to Accumulator Replacement. 4. Use J 38185 to reposition the front heater inlet hose clamp from the auxiliary heater water pump. 5. Remove the front heater inlet hose (1) from the auxiliary heater water pump. 6. Use J 38185 to reposition the top heater inlet hose clamp from the auxiliary heater water pump. 7. Remove the top heater inlet hose (2) from the auxiliary heater water pump. 8. Disconnect the auxiliary heater water pump electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4900 9. Remove the auxiliary heater water pump bracket retaining nuts. 10. Remove the auxiliary heater water pump from the vehicle. 11. Remove the clips from the auxiliary heater water pump bracket. 12. Remove the auxiliary heater water pump from the auxiliary heater water pump bracket. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4901 1. Install the auxiliary heater water pump to the auxiliary heater water pump bracket. 2. Install the auxiliary heater water pump retaining clips. 3. Install the auxiliary heater water pump to the vehicle. Notice: Refer to Fastener Notice in Service Precautions. 4. Install the auxiliary heater water pump bracket retaining. ^ Tighten the nuts to 9 Nm (80 inch lbs.). 5. Connect the auxiliary heater water pump electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4902 6. Install the top heater inlet hose (2) to the auxiliary heater water pump. 7. Use J 38185 to reposition the top heater inlet hose clamp. 8. Install the front heater inlet hose (1) to the auxiliary heater water pump. 9. Use J 38185 to reposition the front heater inlet hose clamp to the auxiliary heater water pump. 10. If equipped with a L6 engine, install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement. 11. If equipped with a V8 engine, install the air conditioning accumulator. Refer to Accumulator Replacement. 12. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4903 Water Pump: Service and Repair Water Pump Replacement Water Pump Replacement (LH6 and LS2) ^ Tools Required J 38185 Hose Clamp Pliers Removal Procedure 1. Drain the cooling system. 2. Loosen the air cleaner outlet duct clamps at the following locations: ^ Throttle body ^ Mass air flow (MAF)/intake air temperature (IAT) sensor 3. Remove the air cleaner outlet duct bolt and duct. 4. Remove the accessory drive belt tensioner. 5. Remove the cooing fan and shroud. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4904 6. Using the J 38185, reposition the inlet hose clamp at the water pump. 7. Remove the inlet hose from the water pump. 8. Using the J 38185, reposition the outlet hose clamp at the water pump. 9. Remove the outlet hose from the water pump. 10. Remove the auxiliary heater inlet and outlet hose/pipe nut. 11. Using the J 38185, reposition the throttle body hose clamp at the throttle body. 12. Remove the hose from the throttle body. 13. Using the J 38185, reposition the auxiliary heater inlet and outlet hose/pipe clamps at the water pump. 14. Remove the inlet and outlet hoses/pipes from the water pump. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4905 15. Remove the water pump bolts. 16. Remove the water pump and gaskets. 17. Discard the water pump gaskets. Installation Procedure Notice: Refer to Fastener Notice in Service Precautions. Important: All gasket surfaces are to be free of oil or other foreign material during assembly. 1. Install the water pump and NEW gaskets. 2. Install the water pump bolts. 1. On the initial pass, tighten the bolts to 15 Nm (11 ft. lbs.). 2. On the final pass, tighten the bolts to 30 Nm (22 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4906 3. Install the auxiliary heater inlet and outlet hose/pipe nut. ^ Tighten the nut to 10 Nm (89 inch lbs.). 4. Install the hose to the throttle body. 5. Using J 38185, position the throttle body hose clamp at the throttle body. 6. Install the inlet and outlet hoses/pipes to the water pump. 7. Using J 38185, position the auxiliary heater inlet and outlet hose/pipe clamps at the water pump. 8. Install the outlet hose to the water pump. 9. Using J 38185, position the outlet hose clamp at the water pump. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Cooling System > Water Pump > Component Information > Service and Repair > Auxiliary Water Pump Replacement > Page 4907 10. Install the inlet hose to the water pump. 11. Using J 38185, position the inlet hose clamp at the water pump. 12. Install the cooing fan and shroud. 13. Install the accessory drive belt tensioner. 14. Install the air cleaner outlet duct and bolt. ^ Tighten the bolt to 10 Nm (89 inch lbs.). 15. Tighten the air cleaner outlet duct clamps at the following locations: ^ Throttle body ^ MAF/IAT sensor ^ Tighten the clamps to 7 Nm (62 inch lbs.). 16. Fill the cooling system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Catalytic Converter > Catalyst Shield > Component Information > Service and Repair Catalyst Shield: Service and Repair Catalytic Converter Heat Shield Replacement Removal Procedure 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the 5 bolts securing the heat shield to the floor panel studs. 3. Remove the heat shield from the vehicle. Installation Procedure 1. Place the catalytic converter heat shield onto the floor panel studs. 2. Notice: Secure the heat shield with the 5 bolts. ^ Tighten the catalytic converter heat shield bolts to 7 Nm (62 inch lbs.). 3. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Manifold > Component Information > Specifications Exhaust Manifold: Specifications Exhaust Manifold Bolts - First Pass .......................................................................................................................................................... 15 Nm (11 ft. lbs.) Exhaust Manifold Bolts - Final Pass ......................................................................................................................................................... 20 Nm (15 ft. lbs.) Exhaust Manifold Heat Shield Bolts ....................................................................................................................................................... 9 Nm (80 inch lbs.) Exhaust Manifold Studs ........................................................................................... ................................................................................. 20 Nm (15 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Manifold > Component Information > Service and Repair > Exhaust Manifold Replacement - Left Exhaust Manifold: Service and Repair Exhaust Manifold Replacement - Left Exhaust Manifold Replacement - Left Removal Procedure 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the nuts securing the catalytic converter to the left exhaust manifold. 3. Lower the vehicle. 4. Remove the spark plugs. 5. Remove the heat shield bolts, and shield from the exhaust manifold. 6. Remove the exhaust manifold bolts, manifold, and gasket. 7. Discard the gasket. 8. Clean and inspect the exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection for the 5.3L engine or Exhaust Manifold Cleaning and Inspection for the 6.0L engine. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Manifold > Component Information > Service and Repair > Exhaust Manifold Replacement - Left > Page 4918 Important: ^ Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance. ^ The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material. 1. Important: Do not apply sealant to the first 3 threads of the bolt. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493, (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the exhaust manifold NEW gasket and bolts. 1. Tighten the bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts. 2. Tighten the bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts. 3. Install the heat shield, and bolts to the exhaust manifold. ^ Tighten the bolts to 9 Nm (80 inch lbs.). 4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head. 5. Install the spark plugs. 6. Raise the vehicle. 7. Install the nuts that secure the catalytic converter to the left exhaust manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Manifold > Component Information > Service and Repair > Exhaust Manifold Replacement - Left > Page 4919 ^ Tighten the nuts to 50 Nm (37 ft. lbs.). 8. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Manifold > Component Information > Service and Repair > Exhaust Manifold Replacement - Left > Page 4920 Exhaust Manifold: Service and Repair Exhaust Manifold Replacement - Right Exhaust Manifold Replacement - Right 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the nuts securing the catalytic converter to the right exhaust manifold. 3. Lower the vehicle. 4. Remove the spark plugs. 5. Remove the heat shield bolts, and shield from the exhaust manifold. 6. Remove the exhaust manifold bolts, manifold, and gasket. 7. Discard the gasket. 8. Clean and inspect the exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection for the 5.3L engine or Exhaust Manifold Cleaning and Inspection for the 6.0L engine. Installation Procedure Important: ^ Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Manifold > Component Information > Service and Repair > Exhaust Manifold Replacement - Left > Page 4921 ^ The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material. 1. Important: Do not apply sealant to the first 3 threads of the bolt. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the exhaust manifold NEW gasket and bolts. 1. Tighten the bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts. 2. Tighten the bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts. 3. Install the heat shield, and bolts to the exhaust manifold. ^ Tighten the bolts to 9 Nm (80 inch lbs.). 4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head. 5. Install the spark plugs. 6. Raise the vehicle. 7. Install the nuts that secure the catalytic converter to the left exhaust manifold. ^ Tighten the nuts to 50 Nm (37 ft. lbs.). 8. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Pipe/Muffler Hanger > Component Information > Service and Repair Exhaust Pipe/Muffler Hanger: Service and Repair Exhaust System Insulator, Hanger, Bracket Replacement Removal Procedure 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Disconnect the heated oxygen sensor (H2OS) electrical connector. 3. Remove the nuts that secure the catalytic converter pipe to the exhaust manifold. 4. Discard the old exhaust seal. Do NOT reuse the seal. 5. Remove the nuts that secure the catalytic converter pipe to the muffler. 6. Remove the bolt securing the exhaust hanger to the transmission mount. 7. Remove the transmission mount. 8. Remove the catalytic converter and exhaust hanger assembly from the vehicle. 9. Remove the exhaust hanger from the catalytic converter. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Pipe/Muffler Hanger > Component Information > Service and Repair > Page 4925 1. Install the exhaust hanger to the catalytic converter. 2. Install the catalytic converter and exhaust hanger assembly to the vehicle. 3. Notice: Refer to Fastener Notice in Service Precautions. Install the bolt securing the catalytic converter pipe hanger to the transmission mount. ^ Tighten the bolt to 30 Nm (22 ft. lbs.). 4. Install the transmission mount. 5. Install the catalytic converter pipe to the exhaust manifold with a NEW exhaust seal. 6. Hand thread the nuts evenly against the exhaust flange until the pipe is secure. ^ Tighten the nuts to 50 Nm (37 ft. lbs.). 7. Connect the H2OS electrical connector. 8. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Heat Shield, Exhaust > Component Information > Service and Repair > Exhaust Manifold Heat Shield Replacement Heat Shield: Service and Repair Exhaust Manifold Heat Shield Replacement Exhaust Manifold Heat Shield Replacement Removal Procedure 1. Remove the air cleaner outlet resonator. 2. Remove the transmission filler tube stud nut from the A.I.R. adapter and move the filler out of the way. 3. Remove the oil level indicator tube. 4. Remove the oxygen sensor from the exhaust manifold. 5. Remove the 4 manifold heat shield nuts and remove the heat shield. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Heat Shield, Exhaust > Component Information > Service and Repair > Exhaust Manifold Heat Shield Replacement > Page 4930 1. Notice: Install the exhaust manifold heat shield with the 4 nuts. ^ Tighten the exhaust manifold heat shield nuts to 10 Nm (89 inch lbs.). 2. Install the oxygen sensor. 3. Install the oil level indicator. 4. Move the transmission filler tube back onto the stud and secure the tube with the nut. ^ Tighten the transmission filler tube bracket nut to 10 Nm (89 inch lbs.). 5. Install the air cleaner outlet resonator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Heat Shield, Exhaust > Component Information > Service and Repair > Exhaust Manifold Heat Shield Replacement > Page 4931 Heat Shield: Service and Repair Exhaust Manifold Heat Shield Replacement - Left Exhaust Manifold Heat Shield Replacement - Left Removal Procedure 1. Remove the spark plugs. 2. Remove the heat shield bolts and the shield from the exhaust manifold. Installation Procedure 1. Notice: Refer to Fastener Notice in Service Precautions. Install the heat shield and the bolts to the exhaust manifold. ^ Tighten the bolts to 9 Nm (80 inch lbs.). 2. Install the spark plugs. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Heat Shield, Exhaust > Component Information > Service and Repair > Exhaust Manifold Heat Shield Replacement > Page 4932 Heat Shield: Service and Repair Exhaust Manifold Heat Shield Replacement - Right Exhaust Manifold Heat Shield Replacement - Right Removal Procedure 1. Remove the spark plugs. 2. Remove the heat shield bolts and the shield from the exhaust manifold. Installation Procedure 1. Notice: Refer to Fastener Notice in Service Precautions. Install the heat shield and the bolts to the exhaust manifold. ^ Tighten the bolts to 9 Nm (80 inch lbs.). 2. Install the spark plugs. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Heat Shield, Exhaust > Component Information > Service and Repair > Exhaust Manifold Heat Shield Replacement > Page 4933 Heat Shield: Service and Repair Exhaust Muffler Heat Shield Replacement Exhaust Muffler Heat Shield Replacement Removal Procedure 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the catalytic converter heat shield rear 2 bolts where the catalytic converter heat shield connects to the muffler heat shield. 3. Remove the remaining exhaust muffler heat shield bolts and remove the heat shield from the floor panel studs. Installation Procedure 1. Install the muffler heat shield to the floor panel studs placing the muffler heat shield under the rear part of the converter heat shield. 2. Notice: Secure the muffler heat shield with 5 bolts. ^ Tighten the exhaust muffler heat shield bolts to 7 Nm (62 inch lbs.). 3. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Muffler > Component Information > Service and Repair > Exhaust System Insulator, Hanger, Bracket Replacement Muffler: Service and Repair Exhaust System Insulator, Hanger, Bracket Replacement Exhaust System Insulator, Hanger, Bracket Replacement Removal Procedure 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Disconnect the heated oxygen sensor (H2OS) electrical connector. 3. Remove the nuts that secure the catalytic converter pipe to the exhaust manifold. 4. Discard the old exhaust seal. Do NOT reuse the seal. 5. Remove the nuts that secure the catalytic converter pipe to the muffler. 6. Remove the bolt securing the exhaust hanger to the transmission mount. 7. Remove the transmission mount. 8. Remove the catalytic converter and exhaust hanger assembly from the vehicle. 9. Remove the exhaust hanger from the catalytic converter. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Muffler > Component Information > Service and Repair > Exhaust System Insulator, Hanger, Bracket Replacement > Page 4938 1. Install the exhaust hanger to the catalytic converter. 2. Install the catalytic converter and exhaust hanger assembly to the vehicle. 3. Notice: Refer to Fastener Notice in Service Precautions. Install the bolt securing the catalytic converter pipe hanger to the transmission mount. ^ Tighten the bolt to 30 Nm (22 ft. lbs.). 4. Install the transmission mount. 5. Install the catalytic converter pipe to the exhaust manifold with a NEW exhaust seal. 6. Hand thread the nuts evenly against the exhaust flange until the pipe is secure. ^ Tighten the nuts to 50 Nm (37 ft. lbs.). 7. Connect the H2OS electrical connector. 8. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Muffler > Component Information > Service and Repair > Exhaust System Insulator, Hanger, Bracket Replacement > Page 4939 Muffler: Service and Repair Muffler Replacement Muffler Replacement Removal Procedure 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Important: Do not reuse any component of the exhaust system that is corroded or damaged. Important: When replacing the muffler in a vehicle with the LL8 engine, the resonator and tailpipe must also be ordered. The two pieces may be attached with a clamp. Inspect the exhaust system components to determine if they can be reused. 3. Remove the frame brace. 4. Remove the nuts that secure the muffler to the catalytic converter pipe. 5. Separate the muffler and the tail pipe assembly from the hanger insulators. 6. Lower the muffler and tail pipe assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Muffler > Component Information > Service and Repair > Exhaust System Insulator, Hanger, Bracket Replacement > Page 4940 7. Suitably support the exhaust system. 8. Cut the exhaust pipe at the dashed line (1). 9. Remove the muffler from the tail pipe. Installation Procedure 1. Install the new muffler to the tail pipe. 2. Attach the muffler and tail pipe to the hanger insulators. 3. Notice: Install the muffler to the catalytic converter and secure with the nuts. ^ Tighten the nuts to 45 Nm (33 ft. lbs.). 4. Loosely install the clamp to secure the muffler to the tail pipe. 5. Align the tail pipe in the proper position. ^ Tighten the clamp nuts to 50 Nm (37 ft. lbs.). 6. Inspect the exhaust system for leaks and underbody contact. 7. Install the frame brace. 8. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Engine, Cooling and Exhaust > Exhaust System > Exhaust Resonator > Component Information > Service and Repair Exhaust Resonator: Service and Repair Resonator Replacement Removal Procedure 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Important: Do not reuse any component of the exhaust system that is corroded or damaged. Inspect the exhaust system components to determine if they can be reused. 3. Cut (1) the resonator pipe as close to the exhaust hanger as possible. 4. Separate the resonator and tailpipe assembly from the hanger insulators. 5. Remove the resonator and tailpipe assembly. Installation Procedure 1. Install the new resonator and tailpipe assembly to the muffler. 2. Attach the resonator and tailpipe to the hanger insulators. 3. Loosely install the clamp to secure the resonator to the muffler. 4. Notice: Align the tailpipe in the proper position. ^ Tighten the clamp nuts to 50 Nm (37 ft. lbs.). 5. Inspect the exhaust system for leaks and underbody contact. 6. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Locations Body Control Module (BCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions Body Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4952 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4953 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4954 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4955 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4956 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4957 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4958 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4959 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4960 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4961 Body Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4962 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4963 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4964 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4965 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4966 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4967 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4968 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4969 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4970 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4971 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4972 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4973 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4974 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4975 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4976 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4977 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4978 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4979 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4980 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4981 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4982 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4983 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4984 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4985 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4986 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4987 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4988 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4989 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4990 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4991 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4992 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4993 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4994 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4995 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4996 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4997 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4998 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 4999 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5000 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5001 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5002 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5003 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5004 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5005 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5006 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5007 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5008 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5009 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5010 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5011 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5012 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5013 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5014 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5015 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5016 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5017 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5018 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5019 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5020 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5021 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5022 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5023 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5024 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5025 Body Control Module: Connector Views Body Control Module (BCM) C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5026 Body Control Module (BCM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5027 Body Control Module (BCM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5028 Body Control Module (BCM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5029 Body Control Module (BCM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5030 Body Control Module: Electrical Diagrams Door Control Module Diagrams Door Control Module Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5031 Door Control Module Diagram 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5032 Door Control Module Diagram 3 Locations: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Body Control System Diagrams Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5033 Body Control System Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5034 Body Control System Diagram 2 (1 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5035 Body Control System Diagram 3 (2 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5036 Body Control System Diagram 4 (3 Of 3) Location: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System Body Control Module: Description and Operation Body Control System BODY CONTROL SYSTEM DESCRIPTION AND OPERATION BCM FUNCTIONS The body control module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be: Sensors and switches that are directly connected to the BCM - Class 2 serial data received from other control modules connected to the class 2 serial data link. The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message. The BCM controls these functions: Audible warnings-Refer to Audible Warnings Description and Operation in Instrument Panel, Gages and Console - Automatic door locks-Refer to Power Door Locks Description and Operation in Doors - Automatic headlamp control-Refer to Exterior Lighting Systems Description and Operation in Lighting Systems - Interior lighting-Refer to Interior Lighting Systems Description and Operation in Lighting Systems - Keyless entry (AUO option)-Refer to Keyless Entry System Description and Operation in Keyless Entry. - Passlock theft deterrent-Refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent. - Retained accessory power (RAP)-Refer to Retained Accessory Power (RAP) Description and Operation POWER MODE The BCM is the power mode master (PMM). Refer to Power Mode Description and Operation for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 5039 Body Control Module: Description and Operation Power Mode POWER MODE DESCRIPTION AND OPERATION SERIAL DATA POWER MODE On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition 0, Ignition 1, and Accessory. To determine the correct power mode the BCM uses: The state of these signals - The sequence of switch closures received by the BCM - The status of the engine run flag Correct Ignition Switch Inputs The chart indicates the power modes detected and transmitted by the BCM. FAIL-SAFE OPERATION Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the body control module (BCM) fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode. SERIAL DATA MESSAGES The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid BCM message until they receive the engine status from the powertrain control module (PCM). If the BCM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is true, indicating that the engine is running, the modules fail-safe to Run. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is false, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. DISCRETE IGNITION SIGNALS Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid BCM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, B+, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 5040 Body Control Module: Description and Operation Retained Accessory Power (RAP) RETAINED ACCESSORY POWER (RAP) DESCRIPTION AND OPERATION SERIAL DATA CONTROL OF RETAINED ACCESSORY POWER (RAP) The class 2 modules receive the power mode message from the body control module (BCM) over the serial data circuits, indicating when the retained accessory power (RAP) power mode is current. The BCM monitors the ignition switch position, battery condition and passenger compartment doors status to determine whether RAP should be initiated. The modules then support the operation of the systems under their control as required by their RAP power mode operation. RAP will end when one of the following conditions is met: The BCM receives an input indicating the opening of any compartment door. - The BCM internal timer for the RAP expires after approximately 10 minutes. - The BCM detects a decrease in battery capacity below a prescribed limit. The BCM then sends a serial data power mode message Off-Awake ending the RAP function. The class 2 RAP functions are: The power windows - The entertainment devices - The DIC BCM/RELAY CONTROL OF RETAINED ACCESSORY POWER (RAP) The BCM keeps the RAP relay energized during all power modes, except Off-Awake. The devices powered through the RAP relay or controlled directly by BCM are: The rear vent windows - The sunroof The devices controlled by the BCM through the RAP supply voltage circuit are: The power roof module (PRM) - The mid-gate glass Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview Body Control Module: Initial Inspection and Diagnostic Overview DIAGNOSTIC STARTING POINT Begin the system diagnosis with Diagnostic System Check - Vehicle. The Diagnostic System Check - Vehicle will provide the following information: - The identification of the control modules which are not communicating. - The identification of any stored diagnostic trouble codes (DTCs) and their status. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin vehicle diagnosis. These must be performed before system DTC or symptom diagnosis. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 5043 Body Control Module: Symptom Related Diagnostic Procedures SYMPTOMS IMPORTANT: The following steps must be completed before using the symptom tables. 1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true: - There are no DTCs set. - The control modules can communicate via the serial data links. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures 2. Review the system operation in order to familiarize yourself with the system functions. Refer to: - Data Link Communications Description and Operation - Body Control System Description and Operation - Retained Accessory Power (RAP) Description and Operation Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the systems. - Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: - Scan Tool Does Not Power Up See: Computers and Control Systems/Information Bus/Testing and Inspection/Scan Tool Does Not Power Up - Scan Tool Does Not Communicate with High Speed GMLAN Device See: Computers and Control Systems/Information Bus/Testing and Inspection/Scan Tool Does Not Communicate with High Speed GMLAN Device - Power Mode Mismatch See: Starting and Charging/Testing and Inspection/Symptom Related Diagnostic Procedures/Power Mode Mismatch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement Body Control Module: Service and Repair Body Control Module Replacement BODY CONTROL MODULE REPLACEMENT REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. Do not open the BCM housing. The module does not have any serviceable components. The module may be replaced only as an assembly. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the 40-way body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 5046 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, remove the BCM (1) from the rear electrical center. INSTALLATION PROCEDURE 1. Index the slots on the BCM (1) to the rear electrical center. 2. Using a downward motion, install the BCM to the rear electrical center. 3. Connect the 24-way gray electrical connector (1) to the BCM. 4. Connect the 32-way tan electrical connector (2) to the BCM. 5. Connect the 40-way body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 5047 6. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 7. Install the rear electrical center cover. 8. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 9. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 10. Connect the negative battery cable. 11. If installing a replacement BCM, program the BCM. Refer to Control Module References. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 5048 Body Control Module: Service and Repair Body Wiring Harness Extension Replacement - BCM BODY WIRING HARNESS EXTENSION REPLACEMENT - BCM REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 5049 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, disconnect the body wiring extension (1) from the rear electrical center. 11. Remove the body wiring extension from the vehicle. INSTALLATION PROCEDURE 1. Using a downward motion, install the body wiring extension (1) to the rear electrical center. IMPORTANT: Ensure the sliding latch is fully extended before connecting the body wiring extension to the rear electrical center. 2. Connect the 24-way gray electrical connector (1) to the BCM. 3. Connect the 32-way tan electrical connector (2) to the BCM. 4. Connect the body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 5050 5. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 6. Install the rear electrical center cover. 7. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 8. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 9. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage Engine Control Module: Technical Service Bulletins Engine Controls - Aftermarket Accessory Usage INFORMATION Bulletin No.: 04-06-04-054B Date: November 18, 2010 Subject: Info - Non-GM Parts and Accessories (Aftermarket) Models: 2011 and Prior GM Passenger Cars and Trucks Supercede: This bulletin is being revised to add model years and update to the new U.S. Fixed Operation Manager (FOM) and Canada Warranty Manager (WM) names. Please discard Corporate Bulletin Number 04-06-04-054A (Section 06 - Engine/Propulsion System). The recent rise and expansion of companies selling non-GM parts and accessories has made it necessary to issue this reminder to dealers regarding GM's policy on the use and installation of these aftermarket components. When a dealer is performing a repair under the New Vehicle Limited Warranty, they are required to use only genuine GM or GM-approved parts and accessories. This applies to all warranty repairs, special policy repairs or any repairs paid for by GM. Parts and accessories advertised as being "the same" as parts manufactured by GM, but not sold through GM, do not qualify for use in warranty repairs, special policy repairs or any repairs paid for by GM. During a warranty repair, if a GM original equipment part is not available through GM Customer Care and Aftersales (GM CC&A;), ACDelco(R) distributors, other GM dealers or approved sources, the dealer is to obtain comparable, non-GM parts and clearly indicate, in detail, on the repair order the circumstances surrounding why non-GM parts were used. The dealer must give customers written notice, prior to the sale or service, that such parts or accessories are not marketed or warranted by General Motors. It should also be noted that dealers modifying new vehicles and installing equipment, parts and accessories obtained from sources not authorized by GM are responsible for complying with the National Traffic and Motor Vehicle Safety Act. Certain non-approved parts or assemblies, installed by the dealer or its agent not authorized by GM, may result in a change to the vehicle's design characteristics and may affect the vehicle's ability to conform to federal law. Dealers must fully understand that non-GM approved parts may not have been validated, tested or certified for use. This puts the dealer at risk for potential liability in the event of a part or vehicle failure. If a GM part failure occurs as the result of the installation or use of a non-GM approved part, the warranty will not be honored. A good example of non-authorized modification of vehicles is the result of an ever increasing supply of aftermarket devices available to the customer, which claim to increase the horsepower and torque of the Duramax(TM) Diesel Engines. These include the addition of, but are not limited to one or more of the following modifications: - Propane injection - Nitrous oxide injection - Additional modules (black boxes) that connect to the vehicle wiring systems - Revised engine calibrations downloaded for the engine control module - Calibration modules which connect to the vehicle diagnostic connector - Modification to the engine turbocharger waste gate Although the installation of these devices, or modification of vehicle components, can increase engine horsepower and torque, they may also negatively affect the engine emissions, reliability and/or durability. In addition, other powertrain components, such as transmissions, universal joints, drive shafts, and front/rear axle components, can be stressed beyond design safety limits by the installation of these devices. General Motors does not support or endorse the use of devices or modifications that, when installed, increase the engine horsepower and torque. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Refer to the latest version of Bulletin 09-06-04-026 (V8 Gas Engines) or 06-06-01-007 (Duramax(TM) Diesel Engines) for more information on dealer requirements for calibration verification. These same policies apply as they relate to the use of non-GM accessories. Damage or failure from the use or installation of a non-GM accessory will not be covered under warranty. Failure resulting from the alteration or modification of the vehicle, including the cutting, welding or disconnecting of the vehicle's original equipment parts and components will void the warranty. Additionally, dealers will NOT be reimbursed or compensated by GM in the event of any legal inquiry at either the local, state or federal level that Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5055 results from the alteration or modification of a vehicle using non-GM approved parts or accessories. Dealers should be especially cautious of accessory companies that claim the installation of their product will not void the factory warranty. Many times these companies have even given direction on how to quickly disassemble the accessory in an attempt to preclude the manufacturer from finding out that is has been installed. Any suspect repairs should be reviewed by the Fixed Operations Manager (FOM), and in Canada by the Warranty Manager (WM) for appropriate repair direction. If it is decided that a goodwill repair is to be made on the vehicle, even with the installation of such non-GM approved components, the customer is to be made aware of General Motors position on this issue and is to sign the appropriate goodwill documentation required by General Motors. It is imperative for dealers to understand that by installing such devices, they are jeopardizing not only the warranty coverage, but also the performance and reliability of the customer's vehicle. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5056 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026C Date: August 13, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2011 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to the latest version of Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine , transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5057 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. Note All pictures must be sent as a.jpg file. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5058 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5059 Note All pictures must be sent as a.jpg file. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5060 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026B Date: April 07, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2010 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2010 model year and information about retrieving calibrations on a Global A vehicle. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5061 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5062 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5063 Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 5064 Engine Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Page 5065 Engine Control Module (ECM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions Engine Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5068 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5069 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5070 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5071 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5072 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5073 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5074 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5075 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5076 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5077 Engine Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5078 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5079 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5080 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5081 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5082 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5083 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5084 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5085 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5086 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5087 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5088 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5089 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5090 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5091 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5092 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5093 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5094 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5095 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5096 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5097 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5098 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5099 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5100 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5101 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5102 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5103 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5104 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5105 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5106 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5107 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5108 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5109 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5110 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5111 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5112 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5113 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5114 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5115 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5116 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5117 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5118 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5119 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5120 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5121 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5122 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5123 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5124 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5125 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5126 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5127 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5128 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5129 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5130 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5131 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5132 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5133 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5134 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5135 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5136 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5137 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5138 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5139 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5140 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5141 Engine Control Module: Connector Views Engine Control Module (ECM) C1 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5142 Engine Control Module (ECM) C1 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5143 Engine Control Module (ECM) C1 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5144 Engine Control Module (ECM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5145 Engine Control Module (ECM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5146 Engine Control Module (ECM) C2 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5147 Engine Control Module (ECM) C2 (Part 4) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5148 Engine Control Module (ECM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 5149 Engine Control Module (ECM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) Engine Control Module: Description and Operation Engine Control Module (ECM) ENGINE CONTROL MODULE (ECM) DESCRIPTION The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The engine control module (ECM) is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the ECM detects a malfunction, the ECM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM. Malfunction Indicator Lamp (MIL) Operation The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON: The MIL indicates that an emissions related fault has occurred and vehicle service is required. The following is a list of the modes of operation for the MIL: The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate. - The MIL turns OFF after the engine is started if a diagnostic fault is not present. - The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate. - The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter. - When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON. - When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 5152 Engine Control Module: Description and Operation Throttle Actuator Control (TAC) System ENGINE CONTROL MODULE The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 5153 Engine Control Module: Description and Operation Electronic Ignition (EI) System ENGINE CONTROL MODULE (ECM) The engine control module (ECM) controls all ignition system functions, and constantly corrects the basic spark timing. The ECM monitors information from various sensor inputs that include the following: - The throttle position (TP) sensor - The engine coolant temperature (ECT) sensor - The mass air flow (MAF) sensor - The intake air temperature (IAT) sensor - The vehicle speed sensor (VSS) - The transmission gear position or range information sensors - The engine knock sensors (KS) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 5154 Engine Control Module: Service and Repair ENGINE CONTROL MODULE (ECM) REPLACEMENT Service of the engine control module (ECM) should consist of either replacement of the ECM or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM. The replacement ECM must be programmed. NOTE: - Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage. - Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery. - In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board. - Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module. - The replacement control module must be programmed. IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change. Removal Procedure 1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life. 2. Disconnect the negative battery cable. 3. Disconnect the cooling fan electrical connector for additional clearance while removing the ECM. 4. Depress the ECM/transmission control module (TCM) cover retainers (2). 5. Remove the ECM/TCM cover from the ECM/TCM bracket (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 5155 6. Disconnect the ECM electrical connectors (2) from the ECM (1). NOTE: Refer to Handling ESD Sensitive Parts Notice in Service Precautions. IMPORTANT: It is not necessary to disconnect the ECM electrical connectors in order to remove the ECM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. - Remove any debris from around the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM. 7. Release the bracket ECM retainers (1). 8. Tilt the ECM (2) away from the ECM/TCM bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 5156 9. Remove the ECM (2) from the ECM bracket (1). 10. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the TCM (1). 11. Remove the ECM/TCM bracket retaining bolts (2). 12. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 5157 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolts to 10 N.m (89 lb in). 4. If the TCM was previously removed from the ECM/TCM bracket (2), install the TCM (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 5158 5. Insert the ECM (2) into the retaining slots of the ECM/TCM bracket (1). 6. Secure the ECM (2) to the ECM/TCM mounting bracket ensuring the ECM retaining tabs (1) are fully engaged. 7. Connect the ECM electrical connectors (2) to the ECM (1) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 5159 12. If the ECM was replaced the replacement ECM must be programmed. See: Testing and Inspection/Programming and Relearning Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 5163 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse - If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations Fuel Pump Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 5168 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 5169 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 5170 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions Fuel Pump Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5173 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5174 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5175 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5176 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5177 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5178 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5179 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5180 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5181 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5182 Fuel Pump Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5183 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5184 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5185 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5186 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5187 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5188 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5189 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5190 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5191 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5192 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5193 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5194 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5195 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5196 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5197 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5198 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5199 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5200 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5201 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5202 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5203 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5204 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5205 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5206 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5207 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5208 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5209 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5210 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5211 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5212 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5213 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5214 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5215 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5216 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5217 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5218 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5219 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5220 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5221 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5222 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5223 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5224 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5225 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5226 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5227 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5228 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5229 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5230 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5231 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5232 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5233 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5234 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5235 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5236 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5237 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5238 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5239 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5240 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5241 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5242 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5243 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5244 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 5245 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 5249 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse - If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5255 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5256 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5257 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5258 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5264 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5265 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5266 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5267 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5268 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5269 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5270 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5271 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5272 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5273 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5274 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5275 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5276 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5277 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5278 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5279 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5280 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5281 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5282 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5283 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5284 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5285 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5286 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5287 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5288 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5289 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5290 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5291 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5292 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5293 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5294 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5295 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5296 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5297 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5298 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5299 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5300 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5301 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5302 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5303 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5304 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5305 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5306 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5307 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5308 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5309 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5310 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5311 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5312 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5313 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5314 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5315 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5316 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5317 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5318 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5319 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5320 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5321 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5322 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5323 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5324 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5325 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5326 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5327 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5328 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5329 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5330 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5331 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5332 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5333 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5334 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5335 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5336 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5337 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 5338 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 5339 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 5340 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5346 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5347 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5348 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5349 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5350 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5351 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5352 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5353 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5354 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5355 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5356 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5357 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5358 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5359 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5360 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5361 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5362 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5363 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5364 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5365 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5366 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5367 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5368 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5369 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5370 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5371 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5372 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5373 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5374 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5375 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5376 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5377 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5378 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5379 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5380 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5381 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5382 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5383 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5384 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5385 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5386 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5387 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5388 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5389 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5390 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5391 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5392 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5393 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5394 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5395 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5396 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5397 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5398 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5399 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5400 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5401 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5402 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5403 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5404 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5405 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5406 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5407 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5408 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5409 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5410 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5411 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5412 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5413 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5414 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5415 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5416 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5417 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5418 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5419 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 5420 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 5421 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 5422 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5431 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5432 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5433 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5434 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5440 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5441 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5442 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 5443 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 5444 Engine Coolant Temperature (ECT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 5445 Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Turn OFF the ignition. NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 4. Lower the vehicle. 5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1). 6. Remove the ECT sensor. INSTALLATION PROCEDURE 1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. - Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 5446 2. Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the sensor to 20 N.m (15 lb ft). 3. Connect the ECT sensor electrical connector (1). 4. Refill the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5452 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5453 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5454 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5455 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5456 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5457 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5458 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5459 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5460 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5461 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5462 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5463 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5464 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5465 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5466 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5467 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5468 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5469 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5470 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5471 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5472 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5473 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5474 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5475 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5476 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5477 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5478 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5479 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5480 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5481 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5482 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5483 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5484 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5485 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5486 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5487 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5488 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5489 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5490 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5491 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5492 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5493 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5494 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5495 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5496 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5497 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5498 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5499 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5500 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5501 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5502 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5503 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5504 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5505 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5506 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5507 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5508 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5509 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5510 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5511 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5512 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5513 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5514 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5515 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5516 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5517 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5518 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5519 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5520 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5521 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5522 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5523 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5524 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5525 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Page 5526 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 5529 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 5530 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams Fuel Pump And Sender Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams > Page 5534 Fuel Level Sensor: Description and Operation FUEL LEVEL SENSOR The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor cord. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor, which changes resistance in correspondence to the amount of fuel in the fuel tank. The engine control module (ECM) sends the fuel level information via the class 2 circuit to the instrument panel cluster (IPC). This information is used for the instrument panel (I/P) fuel gage and the low fuel warning indicator, if applicable. The ECM also monitors the fuel level input for various diagnostics. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement Fuel Level Sensor: Service and Repair Fuel Sender Assembly Replacement FUEL SENDER ASSEMBLY REPLACEMENT TOOLS REQUIRED J 45722 Fuel Tank Sending Unit Wrench REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Remove the fuel feed (1) and EVAP (2) lines from the fuel sender assembly. 3. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. Turn the fuel sender lock ring in a counterclockwise direction. NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring. - Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints. IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 5537 4. Remove the fuel sender assembly (2) and seal (3). Discard the seal. 5. Clean the fuel sender sealing surfaces (4). CAUTION: Refer to Fuel Storage Caution. 6. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. IMPORTANT: Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped. - Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring. - Check the lock ring for flatness. 7. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement. 8. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 5538 1. Install a NEW seal (3) onto the fuel tank. IMPORTANT: Never reuse the old seal or a fuel leak may occur. Always use a NEW seal. 2. Install the fuel sender assembly (2). IMPORTANT: Place the fuel pump strainer in a horizontal position when you install the fuel sender in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm. 3. Use the J 45722 in order to install the fuel sender lock ring. Turn the fuel sender lock ring in a clockwise direction. IMPORTANT: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. Do not apply any type of lubrication in the seal groove. Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 5539 4. Install the fuel feed (1) and EVAP (2) lines to the sender assembly. 5. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 5540 Fuel Level Sensor: Service and Repair Fuel Level Sensor Replacement FUEL LEVEL SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel sender assembly. 2. Disconnect the fuel level sensor electrical connector (1). 3. Depress the fuel level sensor retaining tabs (2) to release the sensor from the sender assembly. 4. Remove the fuel level sensor electrical connector (1) and sensor (2) from the fuel sender assembly. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 5541 1. Install the fuel level sensor (2) and electrical connector (1) to the fuel sender assembly. 2. Connect the fuel level sensor electrical connector (1). 3. Ensure the fuel level sensor retaining tabs (2) are fully engaged. 4. Install the fuel sender assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations Fuel Tank Pressure Sensor: Locations Fuel Tank (Short Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 5545 Fuel Tank (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 5546 Fuel Tank Pressure (FTP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 5547 Fuel Tank Pressure Sensor: Description and Operation FUEL TANK PRESSURE SENSOR The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 5548 Fuel Tank Pressure Sensor: Service and Repair FUEL TANK PRESSURE SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Disconnect the fuel tank pressure sensor electrical connector. 3. Remove the fuel tank pressure sensor. INSTALLATION PROCEDURE 1. Install the fuel tank pressure sensor. 2. Connect the fuel tank pressure sensor electrical connector. 3. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 5552 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 5553 Intake Air Temperature Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 5554 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 5555 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Locations > Page 5559 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5562 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5563 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5564 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5565 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5566 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5567 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5568 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5569 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5570 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5571 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5572 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5573 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5574 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5575 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5576 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5577 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5578 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5579 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5580 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5581 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5582 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5583 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5584 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5585 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5586 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5587 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5588 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5589 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5590 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5591 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5592 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5593 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5594 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5595 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5596 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5597 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5598 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5599 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5600 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5601 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5602 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5603 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5604 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5605 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5606 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5607 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5608 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5609 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5610 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5611 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5612 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5613 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5614 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5615 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5616 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5617 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5618 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5619 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5620 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5621 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5622 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5623 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5624 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5625 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5626 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5627 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5628 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5629 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5630 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5631 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5632 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5633 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5634 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5635 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Page 5636 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 5639 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations Upper Left Side Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 5643 Manifold Absolute Pressure (MAP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 5644 Manifold Pressure/Vacuum Sensor: Service and Repair MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield. 2. Disconnect the manifold absolute pressure (MAP) sensor electrical connector (3). 3. Remove the MAP sensor retaining clip (2) from the intake manifold. 4. Remove the MAP sensor (1) from the intake manifold. INSTALLATION PROCEDURE IMPORTANT: Lightly coat the MAP sensor seal with clean engine oil before installing the sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 5645 1. Install the MAP sensor (1). Push the MAP sensor into the intake manifold. 2. Install the MAP sensor retainer (2) to the intake manifold. 3. Connect the MAP sensor electrical connector (3). 4. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: Customer Interest Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 5654 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: All Technical Service Bulletins Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 5660 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 5661 Oil Pressure Sensor: Service and Repair Engine Oil Pressure Sensor and/or Switch Replacement ^ Tools Required J 41712 Oil Pressure Switch Socket Removal Procedure 1. Remove the intake manifold. 2. Disconnect the oil pressure sensor electrical connector (1). 3. Using J 41712 or equivalent, remove the oil pressure sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 5662 1. Apply sealant to the threads of the oil pressure sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Notice: Refer to Fastener Notice in Service Precautions. 2. Using J 41712 or equivalent, install the oil pressure sensor. ^ Tighten the sensor to 20 Nm (15 ft. lbs.). 3. Connect the oil pressure sensor electrical connector (1). 4. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Locations Below Rear Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions Oxygen Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5668 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5669 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5670 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5671 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5672 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5673 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5674 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5675 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5676 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5677 Oxygen Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5678 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5679 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5680 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5681 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5682 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5683 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5684 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5685 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5686 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5687 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5688 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5689 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5690 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5691 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5692 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5693 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5694 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5695 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5696 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5697 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5698 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5699 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5700 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5701 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5702 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5703 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5704 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5705 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5706 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5707 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5708 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5709 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5710 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5711 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5712 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5713 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5714 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5715 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5716 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5717 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5718 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5719 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5720 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5721 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5722 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5723 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5724 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5725 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5726 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5727 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5728 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5729 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5730 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5731 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5732 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5733 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5734 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5735 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5736 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5737 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5738 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5739 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5740 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5741 Oxygen Sensor: Connector Views Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5742 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5743 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5744 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (3). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 5747 1. Connect the HO2S electrical connector (3). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 5748 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector. 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 5749 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector. 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 5750 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (2). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 5751 1. Connect the HO2S electrical connector (2). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 5752 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector (1). 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 5753 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector (1). 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5758 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5759 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5760 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5761 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5762 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5763 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5764 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5765 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5766 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5767 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5768 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5769 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5770 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5771 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5772 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5773 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5774 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5775 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5776 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5777 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5778 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5779 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5780 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5781 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5782 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5783 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5784 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5785 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5786 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5787 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5788 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5789 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5790 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5791 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5792 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5793 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5794 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5795 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5796 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5797 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5798 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5799 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5800 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5801 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5802 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5803 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5804 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5805 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5806 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5807 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5808 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5809 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5810 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5811 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5812 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5813 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5814 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5815 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5816 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5817 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5818 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5819 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5820 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5821 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5822 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5823 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5824 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5825 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5826 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5827 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5828 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5829 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5830 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 5834 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 5835 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 5836 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 5837 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams Vehicle Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Vehicle Speed Sensor Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams > Page 5841 Vehicle Speed Sensor: Service and Repair Vehicle Speed Sensor (VSS) Replacement Removal Procedure 1. Remove the harness connector. 2. Remove the bolt (2). 3. Remove the vehicle speed sensor (1). 4. Remove the O-ring seal (3). Installation Procedure 1. Install the O-ring seal (3) on the vehicle speed sensor (1). 2. Coat the O-ring seal (3) with a thin film of transmission fluid. 3. Install the vehicle speed sensor (1) into the transmission case. 4. Install the bolt (2). Tighten the bolt to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 5. Connect the wiring harness electrical connector to the vehicle speed sensor. 6. Refill the fluid as required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5846 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5847 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5848 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 5849 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5855 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5856 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5857 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5858 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5859 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5860 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5861 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5862 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5863 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5864 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5865 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5866 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5867 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5868 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5869 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5870 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5871 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5872 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5873 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5874 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5875 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5876 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5877 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5878 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5879 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5880 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5881 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5882 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5883 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5884 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5885 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5886 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5887 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5888 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5889 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5890 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5891 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5892 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5893 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5894 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5895 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5896 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5897 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5898 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5899 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5900 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5901 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5902 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5903 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5904 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5905 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5906 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5907 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5908 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5909 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5910 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5911 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5912 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5913 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5914 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5915 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5916 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5917 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5918 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5919 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5920 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5921 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5922 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5923 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5924 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5925 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5926 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5927 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5928 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 5929 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 5930 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 5931 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5936 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5937 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5938 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5939 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5940 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5941 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5942 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5943 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5944 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5945 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5946 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5947 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5948 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5949 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5950 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5951 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5952 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5953 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5954 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5955 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5956 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5957 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5958 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5959 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5960 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5961 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5962 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5963 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5964 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5965 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5966 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5967 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5968 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5969 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5970 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5971 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5972 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5973 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5974 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5975 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5976 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5977 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5978 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5979 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5980 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5981 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5982 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5983 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5984 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5985 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5986 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5987 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5988 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5989 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5990 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5991 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5992 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5993 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5994 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5995 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5996 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5997 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5998 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 5999 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6000 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6001 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6002 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6003 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6004 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6005 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6006 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6007 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6008 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6015 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6016 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6017 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6018 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6019 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6020 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6021 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6022 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6023 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6024 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6025 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6026 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6027 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6028 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6029 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6030 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6031 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6032 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6033 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6034 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6035 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6036 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6037 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6038 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6039 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6040 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6041 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6042 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6043 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6044 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6045 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6046 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6047 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6048 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6049 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6050 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6051 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6052 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6053 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6054 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6055 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6056 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6057 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6058 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6059 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6060 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6061 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6062 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6063 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6064 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6065 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6066 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6067 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6068 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6069 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6070 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6071 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6072 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6073 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6074 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6075 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6076 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6077 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6078 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6079 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6080 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6081 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6082 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6083 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6084 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6085 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6086 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6087 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6088 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 6089 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 6090 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 6091 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6097 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6098 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6099 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6100 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6101 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6102 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6103 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6104 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6105 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6106 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6107 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6108 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6109 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6110 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6111 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6112 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6113 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6114 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6115 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6116 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6117 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6118 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6119 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6120 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6121 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6122 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6123 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6124 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6125 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6126 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6127 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6128 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6129 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6130 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6131 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6132 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6133 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6134 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6135 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6136 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6137 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6138 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6139 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6140 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6141 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6142 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6143 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6144 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6145 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6146 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6147 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6148 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6149 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6150 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6151 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6152 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6153 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6154 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6155 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6156 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6157 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6158 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6159 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6160 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6161 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6162 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6163 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6164 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6165 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6166 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6167 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6168 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6169 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6170 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Page 6171 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 6174 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 6175 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: Customer Interest A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 6185 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: All Technical Service Bulletins A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 6191 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Page 6192 Ignition Switch Lock Cylinder: Description and Operation KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding Ignition Switch Lock Cylinder: Service and Repair Key and Lock Cylinder Coding KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 6195 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Replacement Ignition Lock Cylinder Replacement Removal Procedure 1. Disconnect the negative battery cable. 2. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 3. Lower the hush and knee bolster. 4. Remove the steering column trim covers. 5. With the key installed, turn the key to the RUN position. 6. Install an allen wrench into the hole on top of the lock cylinder housing. Push down on the allen wrench to release the tab on the lock cylinder inside the lock cylinder housing. 7. Slide the lock cylinder out of the lock cylinder housing. Installation Procedure 1. Install the key into the lock cylinder. 2. Use a screwdriver to rotate the lock cylinder housing gear clockwise to the start position allowing it to spring return into the RUN position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 6196 Important: The gears between the ignition switch and the lock cylinder housing must be in the correct position. Failure to do so will cause a misalignment of the gears in the ignition switch and the lock cylinder housing, which may result in a NO START or BATTERY DRAIN. 3. Align the lock cylinder and install into the lock cylinder housing. 4. Install the steering column trim covers. 5. Install the hush and knee bolster. 6. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. 7. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 6197 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Case Replacement Ignition Lock Cylinder Case Replacement Removal Procedure 1. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 2. Remove the ignition switch. 3. Remove the turn signal cancel cam. 4. Remove the park lock cable from the lock cylinder housing. 5. Remove 3 TORX(R) screws. 6. Remove the lock cylinder housing from the steering column. Installation Procedure 1. Install 3 TORX(R) screws into the lock cylinder housing. Tighten the TORX(R) screws to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 2. Install the turn signal cancel cam. 3. Install the park lock cable into the lock cylinder housing. 4. Install the ignition switch. 5. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Locations > Page 6201 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6204 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6205 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6206 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6207 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6208 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6209 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6210 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6211 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6212 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6213 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6214 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6215 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6216 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6217 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6218 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6219 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6220 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6221 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6222 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6223 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6224 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6225 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6226 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6227 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6228 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6229 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6230 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6231 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6232 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6233 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6234 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6235 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6236 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6237 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6238 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6239 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6240 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6241 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6242 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6243 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6244 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6245 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6246 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6247 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6248 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6249 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6250 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6251 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6252 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6253 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6254 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6255 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6256 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6257 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6258 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6259 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6260 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6261 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6262 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6263 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6264 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6265 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6266 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6267 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6268 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6269 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6270 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6271 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6272 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6273 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6274 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6275 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6276 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6277 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Page 6278 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 6281 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > Specifications Fuel Pressure: Specifications Fuel Pressure (Key ON, Engine OFF).................................................................................................. ..............................................385-425 kPa (55-62 psi) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal Fuel Pressure: Testing and Inspection Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 6288 Fuel Pressure: Testing and Inspection Fuel System Diagnosis FUEL SYSTEM DIAGNOSIS SYSTEM DESCRIPTION The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON. The fuel system is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions. The fuel tank stores the fuel supply. An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times. TEST Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 6289 Step 1 - Step 5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 6290 Step 6 - Step 13 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Idle Speed > System Information > Specifications Idle Speed: Specifications Information not supplied by the manufacturer. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: Customer Interest Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 6303 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: All Technical Service Bulletins Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 6309 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules Relay Module: All Technical Service Bulletins Electrical - MIL ON/DTC's Set By Various Control Modules TECHNICAL Bulletin No.: 09-06-03-004D Date: December 08, 2010 Subject: Intermittent No Crank/No Start, No Module Communication, MIL, Warning Lights, Vehicle Messages or DTCs Set by Various Control Modules - Diagnosing and Repairing Fretting Corrosion (Disconnect Affected Connector and Apply Dielectric Lubricant) Models: 2011 and Prior GM Passenger Cars and Trucks Attention: This repair can be applied to ANY electrical connection including, but not limited to: lighting, body electrical, in-line connections, powertrain control sensors, etc. DO NOT over apply lubricant to the point where it prevents the full engagement of sealed connectors. A light coating on the terminal surfaces is sufficient to correct the condition. Supercede: This bulletin is being revised to update the Attention statement and add the 2011 model year. Please discard Corporate Bulletin Number 09-06-03-004C (Section 06 Engine/Propulsion System). Condition Some customers may comment on any of the following conditions: - An intermittent no crank/no start - Intermittent malfunction indicator lamp (MIL) illumination - Intermittent service lamp illumination - Intermittent service message(s) being displayed The technician may determine that he is unable to duplicate the intermittent condition. Cause This condition may be caused by a buildup of nonconductive insulating oxidized debris known as fretting corrosion, occurring between two electrical contact surfaces of the connection or connector. This may be caused by any of the following conditions: - Vibration - Thermal cycling - Poor connection/terminal retention - Micro motion - A connector, component or wiring harness not properly secured resulting in movement On low current signal circuits this condition may cause high resistance, resulting in intermittent connections. On high current power circuits this condition may cause permanent increases in the resistance and may cause a device to become inoperative. Representative List of Control Modules and Components The following is only a representative list of control modules and components that may be affected by this connection or connector condition and DOES NOT include every possible module or component for every vehicle. - Blower Control Module - Body Control Module (BCM) - Communication Interface Module (CIM) - Cooling Fan Control Module - Electronic Brake Control Module (EBCM) - Electronic Brake and Traction Control Module (EBTCM) - Electronic Suspension Control (ESC) Module - Engine Control Module (ECM) - Heating, Ventilation and Air Conditioning (HVAC) Control Module Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 6315 - HVAC Actuator - Inflatable Restraint Sensing and Diagnostic Module (SDM) - Any AIR BAG module - Seatbelt Lap Anchor Pretensioner - Seatbelt Retractor Pretensioner - An SIR system connection or connector condition resulting in the following DTCs being set: B0015, B0016, B0019, B0020, B0022, or B0023 - Powertrain Control Module (PCM) - Remote Control Door Lock Receiver (RCDLR) - Transmission Control Module (TCM) Correction Important DO NOT replace the control module, wiring or component for the following conditions: - The condition is intermittent and cannot be duplicated. - The condition is present and by disconnecting and reconnecting the connector the condition can no longer be duplicated. Use the following procedure to correct the conditions listed above. 1. Install a scan tool and perform the Diagnostic System Check - Vehicle. Retrieve and record any existing history or current DTCs from all of the control modules (refer to SI). ‹› If any DTC(s) are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). ‹› If DTCs are not set, refer to Symptoms - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). 2. When identified, use the appropriate DTC Diagnostics, Symptoms, Schematics, Component Connector End Views and Component Locator documents to locate and disconnect the affected harness connector(s) which are causing the condition. Note Fretting corrosion looks like little dark smudges on electrical terminals and appear where the actual electrical contact is being made. In less severe cases it may be unable to be seen or identified without the use of a magnifying glass. Important DO NOT apply an excessive amount of dielectric lubricant to the connectors as shown, as hydrolock may result when attempting to mate the connectors. Use ONLY a clean nylon brush that is dedicated to the repair of the conditions in this bulletin. 3. With a one-inch nylon bristle brush, apply dielectric lubricant to both the module/component side and the harness side of the affected connector(s). 4. Reconnect the affected connector(s) and wipe away any excess lubricant that may be present. 5. Attempt to duplicate the condition by using the following information: - DTC Diagnostic Procedure - Circuit/System Description - Conditions for Running the DTC - Conditions for Setting the DTC - Diagnostic Aids - Circuit/System Verification ‹› If the condition cannot be duplicated, the repair is complete. ‹› If the condition can be duplicated, then follow the appropriate DTC, Symptom or Circuit/System Testing procedure (refer to SI). Repair Order Documentation Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 6316 Important The following information MUST be documented on the repair order. Failure to do so may result in a chargeback. - Customer vehicle condition. - Was a Service Lamp or Service Message illuminated? If yes, specify which Service Lamp or Service Message. - Was a DTC(s) set? If yes, specify which DTC(s) were set. - After following the procedure contained within this bulletin, could the condition be duplicated? ‹› If the condition was not duplicated, then document the affected module/component connector name and number on the repair order. - If the condition was duplicated after the procedure contained within this bulletin was followed, and additional diagnosis led to the replacement of a module or component, the SI Document ID Number MUST be written on the repair order. Parts Information Alternate Distributor For All of North America Note NyoGel(R) 760G Lubricant* is equivalent to GMSPO P/N 12377900, and P/N 10953529 (Canada), specified for use to correct the condition in this bulletin. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to: Warranty Information (Saab Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 6317 For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to refer to the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 6323 - HVAC Actuator - Inflatable Restraint Sensing and Diagnostic Module (SDM) - Any AIR BAG module - Seatbelt Lap Anchor Pretensioner - Seatbelt Retractor Pretensioner - An SIR system connection or connector condition resulting in the following DTCs being set: B0015, B0016, B0019, B0020, B0022, or B0023 - Powertrain Control Module (PCM) - Remote Control Door Lock Receiver (RCDLR) - Transmission Control Module (TCM) Correction Important DO NOT replace the control module, wiring or component for the following conditions: - The condition is intermittent and cannot be duplicated. - The condition is present and by disconnecting and reconnecting the connector the condition can no longer be duplicated. Use the following procedure to correct the conditions listed above. 1. Install a scan tool and perform the Diagnostic System Check - Vehicle. Retrieve and record any existing history or current DTCs from all of the control modules (refer to SI). ‹› If any DTC(s) are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). ‹› If DTCs are not set, refer to Symptoms - Vehicle to identify the connector(s) of the control module/component which may be causing the condition (refer to SI). 2. When identified, use the appropriate DTC Diagnostics, Symptoms, Schematics, Component Connector End Views and Component Locator documents to locate and disconnect the affected harness connector(s) which are causing the condition. Note Fretting corrosion looks like little dark smudges on electrical terminals and appear where the actual electrical contact is being made. In less severe cases it may be unable to be seen or identified without the use of a magnifying glass. Important DO NOT apply an excessive amount of dielectric lubricant to the connectors as shown, as hydrolock may result when attempting to mate the connectors. Use ONLY a clean nylon brush that is dedicated to the repair of the conditions in this bulletin. 3. With a one-inch nylon bristle brush, apply dielectric lubricant to both the module/component side and the harness side of the affected connector(s). 4. Reconnect the affected connector(s) and wipe away any excess lubricant that may be present. 5. Attempt to duplicate the condition by using the following information: - DTC Diagnostic Procedure - Circuit/System Description - Conditions for Running the DTC - Conditions for Setting the DTC - Diagnostic Aids - Circuit/System Verification ‹› If the condition cannot be duplicated, the repair is complete. ‹› If the condition can be duplicated, then follow the appropriate DTC, Symptom or Circuit/System Testing procedure (refer to SI). Repair Order Documentation Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 6324 Important The following information MUST be documented on the repair order. Failure to do so may result in a chargeback. - Customer vehicle condition. - Was a Service Lamp or Service Message illuminated? If yes, specify which Service Lamp or Service Message. - Was a DTC(s) set? If yes, specify which DTC(s) were set. - After following the procedure contained within this bulletin, could the condition be duplicated? ‹› If the condition was not duplicated, then document the affected module/component connector name and number on the repair order. - If the condition was duplicated after the procedure contained within this bulletin was followed, and additional diagnosis led to the replacement of a module or component, the SI Document ID Number MUST be written on the repair order. Parts Information Alternate Distributor For All of North America Note NyoGel(R) 760G Lubricant* is equivalent to GMSPO P/N 12377900, and P/N 10953529 (Canada), specified for use to correct the condition in this bulletin. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to: Warranty Information (Saab Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 09-06-03-004D > Dec > 10 > Electrical - MIL ON/DTC's Set By Various Control Modules > Page 6325 For vehicles repaired under warranty, use the appropriate/closest labor operation depending upon the module/component connection that the dielectric lubricant was applied to refer to the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 6326 Air Filter Element: Service and Repair AIR CLEANER ELEMENT REPLACEMENT REMOVAL PROCEDURE 1. Remove the air cleaner outlet duct. 2. Disconnect the mass air flow (MAF) / intake air temperature (IAT) sensor electrical connector (1). 3. Remove the radiator support diagonal brace. 4. Loosen the 4 air cleaner cover retaining screws (1). 5. Remove the air cleaner housing cover (2). Lift and rotate the cover in order to remove the cover from the vehicle. 6. Remove the air filter element (6) and the MAF/IAT sensor (3) from the lower air cleaner housing/washer solvent tank assembly (4). 7. Separate the air filter element (6) from the MAF/IAT sensor (3). 8. Inspect the entire assembly for dust, debris, or water. Clean or replace as necessary. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 6327 1. Install the MAF/IAT sensor (3) to the air filter element (6). 2. Install the air filter element (6) and MAF/IAT sensor (3) to the lower air cleaner housing/washer solvent tank assembly (4). 3. Install the air cleaner cover (2) and secure with 4 retaining screws (1). NOTE: Refer to Fastener Notice. IMPORTANT: Ensure the air inlet duct (5) is properly positioned in the lower air cleaner housing/washer solvent tank assembly (4) before installing the air cleaner cover (2). Tighten the screws to 4 N.m (35 lb in). 4. Install the radiator support diagonal brace. 5. Connect the MAF/IAT sensor electrical connector (1). 6. Install the air cleaner outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure Fuel Pressure Release: Service and Repair Fuel Pressure Relief Procedure FUEL PRESSURE RELIEF PROCEDURE TOOLS REQUIRED J 34730-1A Fuel Pressure Gage 1. Disconnect the negative battery cable. 2. Install J 34730-1A. 3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure. 4. Open the valve on J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing. 5. Drain any fuel remaining in the gage into an approved container. 6. Once the system pressure is completely relieved, remove J 34730-1A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure > Page 6333 Fuel Pressure Release: Service and Repair Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications Ignition Cable: Specifications Spark Plug Wire Resistance................................................................................................................. ................................................397 - 1,337 ohms per ft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications > Page 6337 Ignition Cable: Testing and Inspection SPARK PLUG WIRE INSPECTION Spark plug wire integrity is vital for proper engine operation. A thorough inspection is necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions: 1. Correct routing of the spark plug wires - Incorrect routing may cause cross-firing. 2. Any signs of cracks or splits in the wires. 3. Inspect each boot for the following conditions: - Tearing - Piercing - Arcing - Carbon tracking - Corroded terminal If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or terminal, replace the wire and the component connected to the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Ignition Cable > Component Information > Specifications > Page 6338 Ignition Cable: Service and Repair SPARK PLUG WIRE REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield, if necessary. 2. Remove the spark plug wire from the spark plug. - Twist each spark plug 1/2 turn. - Pull only on the boot in order to remove the wire from each spark plug. 3. Remove the spark plug wire from the ignition coil. - Twist each spark plug boot 1/2 turn. - Pull only on the boot in order to remove the wires from the ignition coil. INSTALLATION PROCEDURE 1. Install the spark plug wire to the ignition coil. 2. Install the spark plug wire to the spark plug. 3. Inspect the wires for proper installation: - Push sideways on each boot in order to inspect the seating. - Reinstall any loose boot. 4. Install the intake manifold sight shield, if necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Spark Plug Gap Spark Plug: Specifications Spark Plug Gap Spark Plug Gap ................................................................................................................................... .................................................... 1.02 mm (0.040 in.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Spark Plug Gap > Page 6343 Spark Plug: Specifications Spark Plug Torque Spark Plug Torque ............................................................................................................................... ................................................... 15 Nm (11.0 lb. ft.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 6344 Spark Plug: Application and ID SPARK PLUG TYPE GM P/N ................................................................................................................................................ .............................................................. 12571164 AC P/N ................................................................................................................................................. .................................................................. 41-985 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 6345 Spark Plug: Testing and Inspection SPARK PLUG INSPECTION - Verify that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to Ignition System Specifications for the correct spark plug. - Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions: Spark plug fouling - Colder plug - Pre-ignition causing spark plug and/or engine damage - Hotter plug - Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1) - Test for a loose terminal post (1) by twisting and pulling the post. The terminal post should not move. - Inspect the insulator (2) for flashover or carbon tracking, or soot. This is caused by the electrical charge traveling across the insulator between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. - Inspect the spark plug recess are of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated will cause arcing to ground. - Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3,4). - Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3). An excessively wide electrode gap can prevent correct spark plug operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 6346 - Inspect for the correct spark plug torque. Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. - Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). - Inspect for a broken or worn side electrode (3). - Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. - A looses center electrode (4) reduces the spark intensity. - Inspect for bridged electrodes (3,4). Deposits on the electrodes (3,4) reduce or eliminates the gap. - Inspect for worn or missing platinum pads on the electrodes (3,4), if equipped. - Inspect for excessive fouling. - Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation. Visual Inspection Normal operation - Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives. - Carbon fouled - Dry, fluffy black carbon, or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors - Excessive fuel pressure - Restricted air filter element - Incorrect combustion - Reduced ignition system voltage output Weak ignition coils - Worn ignition wires - Incorrect spark plug gap - Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off. - Deposit fouling - Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark plug intensity. Most powdery deposits will not affect spark plug intensity unless they form into a glazing over the electrode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 6347 Spark Plug: Service and Repair SPARK PLUG REPLACEMENT REMOVAL PROCEDURE 1. Remove the spark plug wire. 2. Remove the washer solvent container to gain access to the #2 spark plug. 3. Loosen the spark plug 1-2 turns. 4. Brush or using compressed air, blow away any dirt from around the spark plug. 5. Remove the spark plug.If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 6348 1. Correctly position the spark plug washer. 2. Inspect the spark plug gap. Adjust the gap as needed. Spark plug gap: 1.524 mm (0.060 in) 3. Hand start the spark plug in the corresponding cylinder. 4. Tighten the spark plug. - For used heads, tighten the plug to 15 N.m (11 lb ft). - For NEW heads, tighten the plug to 20 N.m (15 lb ft). NOTE: Refer to Fastener Notice. 5. Install the spark plug wire. 6. If removed, install the washer solvent container. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Compression Check > System Information > Specifications Compression Check: Specifications No cylinder should read less than ............................................................................................................................................................ 690 kPa (100 psi). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Tune-up and Engine Performance Checks > Compression Check > System Information > Specifications > Page 6352 Compression Check: Testing and Inspection Engine Compression Test 1. Charge the battery if the battery is not fully charged. 2. Disable the ignition system. 3. Disable the fuel injection system. 4. Remove all spark plugs. 5. Turn the ignition to the ON position. 6. Depress the accelerator pedal to position the throttle plate wide open. 7. Start with the compression gage at zero and crank the engine through 4 compression strokes, 4 puffs. 8. Measure the compression for each cylinder. Record the readings. 9. If a cylinder has low compression, inject approximately 15 ml (1 tablespoon) of engine oil into the combustion chamber through the spark plug hole. Measure the compression again and record the reading. 10. The minimum compression in any 1 cylinder should not be less than 70 percent of the highest cylinder. No cylinder should read less than 690 kPa (100 psi). For example, if the highest pressure in any 1 cylinder is 1,035 kPa (150 psi), the lowest allowable pressure for any other cylinder would be 725 kPa (105 psi). (1,035 x 70% = 725) (150 x 70% = 105). ^ Normal - Compression builds up quickly and evenly to the specified compression for each cylinder. ^ Piston Rings Leaking - Compression is low on the first stroke. Compression builds up with the following strokes, but does not reach normal. Compression improves considerably when you add oil. ^ Valves Leaking - Compression is low on the first stroke. Compression usually does not build up on the following strokes. Compression does not improve much when you add oil. ^ If 2 adjacent cylinders have lower than normal compression, and injecting oil into the cylinders does not increase the compression, the cause may be a head gasket leaking between the cylinders. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 6357 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 6358 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 6359 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 6360 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6366 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6367 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6368 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6369 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6370 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6371 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6372 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6373 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6374 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6375 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6376 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6377 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6378 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6379 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6380 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6381 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6382 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6383 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6384 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6385 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6386 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6387 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6388 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6389 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6390 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6391 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6392 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6393 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6394 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6395 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6396 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6397 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6398 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6399 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6400 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6401 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6402 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6403 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6404 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6405 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6406 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6407 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6408 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6409 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6410 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6411 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6412 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6413 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6414 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6415 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6416 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6417 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6418 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6419 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6420 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6421 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6422 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6423 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6424 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6425 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6426 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6427 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6428 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6429 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6430 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6431 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6432 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6433 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6434 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6435 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6436 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6437 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6438 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6439 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 6440 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 6441 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 6442 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 6446 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 6447 Intake Air Temperature Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 6448 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 6449 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Locations Body Control Module (BCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions Body Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6455 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6456 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6457 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6458 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6459 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6460 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6461 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6462 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6463 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6464 Body Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6465 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6466 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6467 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6468 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6469 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6470 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6471 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6472 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6473 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6474 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6475 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6476 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6477 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6478 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6479 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6480 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6481 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6482 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6483 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6484 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6485 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6486 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6487 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6488 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6489 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6490 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6491 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6492 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6493 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6494 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6495 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6496 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6497 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6498 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6499 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6500 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6501 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6502 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6503 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6504 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6505 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6506 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6507 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6508 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6509 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6510 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6511 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6512 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6513 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6514 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6515 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6516 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6517 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6518 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6519 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6520 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6521 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6522 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6523 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6524 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6525 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6526 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6527 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6528 Body Control Module: Connector Views Body Control Module (BCM) C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6529 Body Control Module (BCM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6530 Body Control Module (BCM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6531 Body Control Module (BCM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6532 Body Control Module (BCM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6533 Body Control Module: Electrical Diagrams Door Control Module Diagrams Door Control Module Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6534 Door Control Module Diagram 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6535 Door Control Module Diagram 3 Locations: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Body Control System Diagrams Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6536 Body Control System Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6537 Body Control System Diagram 2 (1 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6538 Body Control System Diagram 3 (2 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6539 Body Control System Diagram 4 (3 Of 3) Location: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System Body Control Module: Description and Operation Body Control System BODY CONTROL SYSTEM DESCRIPTION AND OPERATION BCM FUNCTIONS The body control module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be: Sensors and switches that are directly connected to the BCM - Class 2 serial data received from other control modules connected to the class 2 serial data link. The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message. The BCM controls these functions: Audible warnings-Refer to Audible Warnings Description and Operation in Instrument Panel, Gages and Console - Automatic door locks-Refer to Power Door Locks Description and Operation in Doors - Automatic headlamp control-Refer to Exterior Lighting Systems Description and Operation in Lighting Systems - Interior lighting-Refer to Interior Lighting Systems Description and Operation in Lighting Systems - Keyless entry (AUO option)-Refer to Keyless Entry System Description and Operation in Keyless Entry. - Passlock theft deterrent-Refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent. - Retained accessory power (RAP)-Refer to Retained Accessory Power (RAP) Description and Operation POWER MODE The BCM is the power mode master (PMM). Refer to Power Mode Description and Operation for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 6542 Body Control Module: Description and Operation Power Mode POWER MODE DESCRIPTION AND OPERATION SERIAL DATA POWER MODE On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition 0, Ignition 1, and Accessory. To determine the correct power mode the BCM uses: The state of these signals - The sequence of switch closures received by the BCM - The status of the engine run flag Correct Ignition Switch Inputs The chart indicates the power modes detected and transmitted by the BCM. FAIL-SAFE OPERATION Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the body control module (BCM) fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode. SERIAL DATA MESSAGES The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid BCM message until they receive the engine status from the powertrain control module (PCM). If the BCM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is true, indicating that the engine is running, the modules fail-safe to Run. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is false, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. DISCRETE IGNITION SIGNALS Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid BCM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, B+, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 6543 Body Control Module: Description and Operation Retained Accessory Power (RAP) RETAINED ACCESSORY POWER (RAP) DESCRIPTION AND OPERATION SERIAL DATA CONTROL OF RETAINED ACCESSORY POWER (RAP) The class 2 modules receive the power mode message from the body control module (BCM) over the serial data circuits, indicating when the retained accessory power (RAP) power mode is current. The BCM monitors the ignition switch position, battery condition and passenger compartment doors status to determine whether RAP should be initiated. The modules then support the operation of the systems under their control as required by their RAP power mode operation. RAP will end when one of the following conditions is met: The BCM receives an input indicating the opening of any compartment door. - The BCM internal timer for the RAP expires after approximately 10 minutes. - The BCM detects a decrease in battery capacity below a prescribed limit. The BCM then sends a serial data power mode message Off-Awake ending the RAP function. The class 2 RAP functions are: The power windows - The entertainment devices - The DIC BCM/RELAY CONTROL OF RETAINED ACCESSORY POWER (RAP) The BCM keeps the RAP relay energized during all power modes, except Off-Awake. The devices powered through the RAP relay or controlled directly by BCM are: The rear vent windows - The sunroof The devices controlled by the BCM through the RAP supply voltage circuit are: The power roof module (PRM) - The mid-gate glass Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview Body Control Module: Initial Inspection and Diagnostic Overview DIAGNOSTIC STARTING POINT Begin the system diagnosis with Diagnostic System Check - Vehicle. The Diagnostic System Check - Vehicle will provide the following information: - The identification of the control modules which are not communicating. - The identification of any stored diagnostic trouble codes (DTCs) and their status. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin vehicle diagnosis. These must be performed before system DTC or symptom diagnosis. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 6546 Body Control Module: Symptom Related Diagnostic Procedures SYMPTOMS IMPORTANT: The following steps must be completed before using the symptom tables. 1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true: - There are no DTCs set. - The control modules can communicate via the serial data links. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures 2. Review the system operation in order to familiarize yourself with the system functions. Refer to: - Data Link Communications Description and Operation - Body Control System Description and Operation - Retained Accessory Power (RAP) Description and Operation Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the systems. - Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: - Scan Tool Does Not Power Up See: Information Bus/Testing and Inspection/Scan Tool Does Not Power Up - Scan Tool Does Not Communicate with High Speed GMLAN Device See: Information Bus/Testing and Inspection/Scan Tool Does Not Communicate with High Speed GMLAN Device - Power Mode Mismatch See: Starting and Charging/Testing and Inspection/Symptom Related Diagnostic Procedures/Power Mode Mismatch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement Body Control Module: Service and Repair Body Control Module Replacement BODY CONTROL MODULE REPLACEMENT REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. Do not open the BCM housing. The module does not have any serviceable components. The module may be replaced only as an assembly. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the 40-way body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 6549 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, remove the BCM (1) from the rear electrical center. INSTALLATION PROCEDURE 1. Index the slots on the BCM (1) to the rear electrical center. 2. Using a downward motion, install the BCM to the rear electrical center. 3. Connect the 24-way gray electrical connector (1) to the BCM. 4. Connect the 32-way tan electrical connector (2) to the BCM. 5. Connect the 40-way body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 6550 6. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 7. Install the rear electrical center cover. 8. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 9. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 10. Connect the negative battery cable. 11. If installing a replacement BCM, program the BCM. Refer to Control Module References. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 6551 Body Control Module: Service and Repair Body Wiring Harness Extension Replacement - BCM BODY WIRING HARNESS EXTENSION REPLACEMENT - BCM REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 6552 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, disconnect the body wiring extension (1) from the rear electrical center. 11. Remove the body wiring extension from the vehicle. INSTALLATION PROCEDURE 1. Using a downward motion, install the body wiring extension (1) to the rear electrical center. IMPORTANT: Ensure the sliding latch is fully extended before connecting the body wiring extension to the rear electrical center. 2. Connect the 24-way gray electrical connector (1) to the BCM. 3. Connect the 32-way tan electrical connector (2) to the BCM. 4. Connect the body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 6553 5. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 6. Install the rear electrical center cover. 7. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 8. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 9. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6559 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6560 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6561 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6562 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6563 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6564 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6565 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6566 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6567 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6568 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6569 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6570 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6571 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6572 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6573 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6574 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6575 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6576 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6577 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6578 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6579 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6580 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6581 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6582 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6583 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6584 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6585 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6586 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6587 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6588 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6589 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6590 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6591 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6592 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6593 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6594 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6595 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6596 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6597 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6598 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6599 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6600 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6601 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6602 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6603 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6604 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6605 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6606 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6607 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6608 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6609 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6610 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6611 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6612 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6613 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6614 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6615 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6616 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6617 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6618 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6619 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6620 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6621 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6622 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6623 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6624 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6625 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6626 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6627 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6628 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6629 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6630 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6631 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6632 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 6633 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 6634 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 6635 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6644 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6645 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6646 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6647 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6653 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6654 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6655 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 6656 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 6657 Engine Coolant Temperature (ECT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 6658 Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Turn OFF the ignition. NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 4. Lower the vehicle. 5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1). 6. Remove the ECT sensor. INSTALLATION PROCEDURE 1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. - Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 6659 2. Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the sensor to 20 N.m (15 lb ft). 3. Connect the ECT sensor electrical connector (1). 4. Refill the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6665 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6666 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6667 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6668 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6669 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6670 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6671 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6672 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6673 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6674 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6675 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6676 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6677 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6678 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6679 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6680 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6681 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6682 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6683 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6684 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6685 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6686 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6687 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6688 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6689 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6690 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6691 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6692 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6693 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6694 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6695 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6696 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6697 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6698 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6699 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6700 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6701 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6702 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6703 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6704 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6705 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6706 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6707 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6708 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6709 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6710 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6711 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6712 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6713 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6714 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6715 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6716 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6717 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6718 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6719 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6720 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6721 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6722 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6723 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6724 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6725 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6726 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6727 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6728 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6729 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6730 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6731 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6732 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6733 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6734 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6735 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6736 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6737 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6738 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Page 6739 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 6742 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 6743 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Locations Data Link Connector: Locations Lower Left Of The I/P Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Locations > Page 6747 Lower Left of The I/P Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions Data Link Connector: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6750 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6751 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6752 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6753 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6754 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6755 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6756 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6757 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6758 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6759 Data Link Connector: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6760 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6761 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6762 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6763 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6764 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6765 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6766 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6767 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6768 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6769 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6770 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6771 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6772 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6773 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6774 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6775 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6776 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6777 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6778 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6779 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6780 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6781 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6782 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6783 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6784 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6785 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6786 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6787 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6788 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6789 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6790 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6791 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6792 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6793 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6794 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6795 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6796 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6797 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6798 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6799 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6800 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6801 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6802 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6803 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6804 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6805 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6806 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6807 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6808 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6809 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6810 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6811 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6812 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6813 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6814 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6815 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6816 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6817 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6818 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6819 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6820 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6821 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6822 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Diagram Information and Instructions > Page 6823 Data Link Connector (DLC) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Page 6824 Data Link Connector: Description and Operation DATA LINK COMMUNICATIONS DESCRIPTION AND OPERATION DATA LINK CONNECTOR (DLC) The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following: Scan tool power battery positive voltage at terminal 16 - Scan tool power ground at terminal 4 - Common signal ground at terminal 5 - Class 2 signal at terminal 2 - High speed GMLAN serial data bus (+) at terminal 6, w/5.3L - High speed GMLAN serial data bus (-) at terminal 14, w/5.3L CLASS 2 CIRCUIT DESCRIPTION The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data circuit. Class 2 serial data is transmitted on a single wire at an average of 10.4 Kbps. The bus is active at 7.0 volts nominal and inactive at ground potential. Each module communicating on the class 2 serial data line sends a state of health (SOH) message every 2 seconds to ensure that the module is operating properly. When a module stops communicating on the class 2 serial data line, for example if the module loses power or ground, the SOH message it normally sends on the data line every 2 seconds disappears. Other modules on the class 2 serial data line, which expect to receive that SOH message, detect its absence; those modules in turn set an internal DTC associated with the loss of SOH of the non-communicating module. The DTC is unique to the module which is not communicating, for example, when the body control module (BCM) SOH message disappears, several modules set DTC U1064. Note that a loss of serial data DTC does not normally represent a failure of the module that set it. The class 2 serial data line on this vehicle is a star configuration. The powertrain control module (PCM) has an additional class 2 serial data circuit to BCM or to theft deterrent control module, if equipped. If one of the class 2 serial data circuits to the PCM opens, communication will not be interrupted. The following modules communicate on the class 2 serial data line: The BCM - The communication interface module (OnStar(R)), w/UE1 - The digital radio receiver (DRR), w/U2K - The driver door module (DDM) - The driver seat module (DSM), w/AAB - The DVD player - The electronic brake control module (EBCM) - The endgate module (EGM), for XUV - The engine control module (ECM), w/5.3L - The HVAC control module - The HVAC control module - rear auxiliary - The inflatable restraint sensing and diagnostic module (SDM) - The instrument panel cluster (IPC) - The liftgate control module (LGM), except XUV - The passenger door module (PDM) - The power roof module (PRM), for XUV - The powertrain control module (PCM), w/4.2L - The radio - The transfer case shift control module (TCSCM), w/4WD - The theft deterrent control module (VTD), w/BAE The class 2 serial data line allows a scan tool to communicate with these modules for testing purposes, checking for DTCs, and to activate/enable/disable functions. These class 2 serial data circuits are bused together via 2 splice packs: SP205-Located behind the instrument panel (I/P) near the headlamp switch connector - SP306-Located in the body harness near the rear of the right rear seat under the carpet Refer to Computer/Integrating Systems Component Views to locate the components. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Page 6825 Data Link Connector: Testing and Inspection DATA LINK REFERENCES Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Data Link Connector > Component Information > Diagrams > Page 6826 This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Electronic Throttle Actuator > Component Information > Description and Operation Electronic Throttle Actuator: Description and Operation THROTTLE ACTUATOR CONTROL (TAC) SYSTEM DESCRIPTION PURPOSE The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions: Accelerator pedal position sensing - Throttle positioning to meet driver and engine demands - Throttle position sensing - Internal diagnostics - Cruise control functions - Manage TAC electrical power consumption The TAC system includes the following components: The accelerator pedal position (APP) sensors - The throttle body assembly - The engine control module (ECM) ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. THROTTLE BODY ASSEMBLY The throttle assembly contains the following components: The throttle blade - The throttle actuator motor - The throttle position (TP) sensor 1 and 2 The throttle body functions similar to a conventional throttle body with the following exceptions: An electric motor opens and closes the throttle valve. - The throttle blade is spring loaded in both directions and the default position is slightly open. - There are 2 individual TP sensors within the throttle body assembly. The TP sensors are used to determine the throttle plate angle. The TP sensors provide the engine control module (ECM) with a signal voltage proportional to throttle plate movement. The TP sensor 1 signal voltage at closed throttle is above 4 volts and decreases as the throttle plate is opened. The TP sensor 2 signal voltage at closed throttle is below 1 volt and increases as the throttle plate is opened. ENGINE CONTROL MODULE The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. MODES OF OPERATION Normal Mode During the operation of the throttle actuator control (TAC) system, several modes or functions are considered normal. The following modes may be entered during normal operation: Minimum pedal value-At key-up, the engine control module (ECM) updates the learned minimum pedal value. - Minimum throttle position (TP) values-At key-up, the ECM updates the learned minimum TP value. In order to learn the minimum TP value, the throttle blade is moved to the closed position. - Ice break mode-If the throttle is not able to reach a predetermined minimum throttle position, the ice break mode is entered. During the ice break mode, the ECM commands the maximum pulse width several times to the throttle actuator motor in the closing direction. - Battery saver mode-After a predetermined time without engine RPM, the ECM commands the battery saver mode. During the battery saver mode, the TAC module removes the voltage from the motor control circuits, which removes the current draw used to maintain the idle position and allows the throttle to return to the spring loaded default position. Reduced Engine Power Mode Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Electronic Throttle Actuator > Component Information > Description and Operation > Page 6830 When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions: Acceleration limiting-The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited. - Limited throttle mode-The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited. - Throttle default mode-The ECM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position. - Forced idle mode-The ECM will perform the following actions: Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF. - Ignore the accelerator pedal input. - Engine shutdown mode-The ECM will disable fuel and de-energize the throttle actuator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage Engine Control Module: Technical Service Bulletins Engine Controls - Aftermarket Accessory Usage INFORMATION Bulletin No.: 04-06-04-054B Date: November 18, 2010 Subject: Info - Non-GM Parts and Accessories (Aftermarket) Models: 2011 and Prior GM Passenger Cars and Trucks Supercede: This bulletin is being revised to add model years and update to the new U.S. Fixed Operation Manager (FOM) and Canada Warranty Manager (WM) names. Please discard Corporate Bulletin Number 04-06-04-054A (Section 06 - Engine/Propulsion System). The recent rise and expansion of companies selling non-GM parts and accessories has made it necessary to issue this reminder to dealers regarding GM's policy on the use and installation of these aftermarket components. When a dealer is performing a repair under the New Vehicle Limited Warranty, they are required to use only genuine GM or GM-approved parts and accessories. This applies to all warranty repairs, special policy repairs or any repairs paid for by GM. Parts and accessories advertised as being "the same" as parts manufactured by GM, but not sold through GM, do not qualify for use in warranty repairs, special policy repairs or any repairs paid for by GM. During a warranty repair, if a GM original equipment part is not available through GM Customer Care and Aftersales (GM CC&A;), ACDelco(R) distributors, other GM dealers or approved sources, the dealer is to obtain comparable, non-GM parts and clearly indicate, in detail, on the repair order the circumstances surrounding why non-GM parts were used. The dealer must give customers written notice, prior to the sale or service, that such parts or accessories are not marketed or warranted by General Motors. It should also be noted that dealers modifying new vehicles and installing equipment, parts and accessories obtained from sources not authorized by GM are responsible for complying with the National Traffic and Motor Vehicle Safety Act. Certain non-approved parts or assemblies, installed by the dealer or its agent not authorized by GM, may result in a change to the vehicle's design characteristics and may affect the vehicle's ability to conform to federal law. Dealers must fully understand that non-GM approved parts may not have been validated, tested or certified for use. This puts the dealer at risk for potential liability in the event of a part or vehicle failure. If a GM part failure occurs as the result of the installation or use of a non-GM approved part, the warranty will not be honored. A good example of non-authorized modification of vehicles is the result of an ever increasing supply of aftermarket devices available to the customer, which claim to increase the horsepower and torque of the Duramax(TM) Diesel Engines. These include the addition of, but are not limited to one or more of the following modifications: - Propane injection - Nitrous oxide injection - Additional modules (black boxes) that connect to the vehicle wiring systems - Revised engine calibrations downloaded for the engine control module - Calibration modules which connect to the vehicle diagnostic connector - Modification to the engine turbocharger waste gate Although the installation of these devices, or modification of vehicle components, can increase engine horsepower and torque, they may also negatively affect the engine emissions, reliability and/or durability. In addition, other powertrain components, such as transmissions, universal joints, drive shafts, and front/rear axle components, can be stressed beyond design safety limits by the installation of these devices. General Motors does not support or endorse the use of devices or modifications that, when installed, increase the engine horsepower and torque. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Refer to the latest version of Bulletin 09-06-04-026 (V8 Gas Engines) or 06-06-01-007 (Duramax(TM) Diesel Engines) for more information on dealer requirements for calibration verification. These same policies apply as they relate to the use of non-GM accessories. Damage or failure from the use or installation of a non-GM accessory will not be covered under warranty. Failure resulting from the alteration or modification of the vehicle, including the cutting, welding or disconnecting of the vehicle's original equipment parts and components will void the warranty. Additionally, dealers will NOT be reimbursed or compensated by GM in the event of any legal inquiry at either the local, state or federal level that Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6835 results from the alteration or modification of a vehicle using non-GM approved parts or accessories. Dealers should be especially cautious of accessory companies that claim the installation of their product will not void the factory warranty. Many times these companies have even given direction on how to quickly disassemble the accessory in an attempt to preclude the manufacturer from finding out that is has been installed. Any suspect repairs should be reviewed by the Fixed Operations Manager (FOM), and in Canada by the Warranty Manager (WM) for appropriate repair direction. If it is decided that a goodwill repair is to be made on the vehicle, even with the installation of such non-GM approved components, the customer is to be made aware of General Motors position on this issue and is to sign the appropriate goodwill documentation required by General Motors. It is imperative for dealers to understand that by installing such devices, they are jeopardizing not only the warranty coverage, but also the performance and reliability of the customer's vehicle. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6836 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026C Date: August 13, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2011 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to the latest version of Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine , transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6837 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. Note All pictures must be sent as a.jpg file. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6838 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6839 Note All pictures must be sent as a.jpg file. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6840 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026B Date: April 07, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2010 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2010 model year and information about retrieving calibrations on a Global A vehicle. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6841 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6842 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6843 Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 6844 Engine Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Page 6845 Engine Control Module (ECM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions Engine Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6848 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6849 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6850 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6851 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6852 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6853 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6854 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6855 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6856 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6857 Engine Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6858 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6859 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6860 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6861 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6862 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6863 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6864 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6865 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6866 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6867 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6868 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6869 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6870 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6871 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6872 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6873 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6874 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6875 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6876 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6877 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6878 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6879 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6880 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6881 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6882 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6883 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6884 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6885 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6886 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6887 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6888 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6889 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6890 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6891 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6892 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6893 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6894 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6895 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6896 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6897 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6898 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6899 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6900 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6901 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6902 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6903 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6904 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6905 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6906 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6907 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6908 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6909 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6910 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6911 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6912 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6913 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6914 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6915 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6916 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6917 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6918 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6919 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6920 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6921 Engine Control Module: Connector Views Engine Control Module (ECM) C1 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6922 Engine Control Module (ECM) C1 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6923 Engine Control Module (ECM) C1 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6924 Engine Control Module (ECM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6925 Engine Control Module (ECM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6926 Engine Control Module (ECM) C2 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6927 Engine Control Module (ECM) C2 (Part 4) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6928 Engine Control Module (ECM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 6929 Engine Control Module (ECM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) Engine Control Module: Description and Operation Engine Control Module (ECM) ENGINE CONTROL MODULE (ECM) DESCRIPTION The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The engine control module (ECM) is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the ECM detects a malfunction, the ECM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM. Malfunction Indicator Lamp (MIL) Operation The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON: The MIL indicates that an emissions related fault has occurred and vehicle service is required. The following is a list of the modes of operation for the MIL: The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate. - The MIL turns OFF after the engine is started if a diagnostic fault is not present. - The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate. - The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter. - When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON. - When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 6932 Engine Control Module: Description and Operation Throttle Actuator Control (TAC) System ENGINE CONTROL MODULE The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 6933 Engine Control Module: Description and Operation Electronic Ignition (EI) System ENGINE CONTROL MODULE (ECM) The engine control module (ECM) controls all ignition system functions, and constantly corrects the basic spark timing. The ECM monitors information from various sensor inputs that include the following: - The throttle position (TP) sensor - The engine coolant temperature (ECT) sensor - The mass air flow (MAF) sensor - The intake air temperature (IAT) sensor - The vehicle speed sensor (VSS) - The transmission gear position or range information sensors - The engine knock sensors (KS) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 6934 Engine Control Module: Service and Repair ENGINE CONTROL MODULE (ECM) REPLACEMENT Service of the engine control module (ECM) should consist of either replacement of the ECM or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM. The replacement ECM must be programmed. NOTE: - Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage. - Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery. - In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board. - Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module. - The replacement control module must be programmed. IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change. Removal Procedure 1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life. 2. Disconnect the negative battery cable. 3. Disconnect the cooling fan electrical connector for additional clearance while removing the ECM. 4. Depress the ECM/transmission control module (TCM) cover retainers (2). 5. Remove the ECM/TCM cover from the ECM/TCM bracket (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 6935 6. Disconnect the ECM electrical connectors (2) from the ECM (1). NOTE: Refer to Handling ESD Sensitive Parts Notice in Service Precautions. IMPORTANT: It is not necessary to disconnect the ECM electrical connectors in order to remove the ECM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. - Remove any debris from around the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM. 7. Release the bracket ECM retainers (1). 8. Tilt the ECM (2) away from the ECM/TCM bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 6936 9. Remove the ECM (2) from the ECM bracket (1). 10. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the TCM (1). 11. Remove the ECM/TCM bracket retaining bolts (2). 12. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 6937 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolts to 10 N.m (89 lb in). 4. If the TCM was previously removed from the ECM/TCM bracket (2), install the TCM (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 6938 5. Insert the ECM (2) into the retaining slots of the ECM/TCM bracket (1). 6. Secure the ECM (2) to the ECM/TCM mounting bracket ensuring the ECM retaining tabs (1) are fully engaged. 7. Connect the ECM electrical connectors (2) to the ECM (1) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 6939 12. If the ECM was replaced the replacement ECM must be programmed. See: Testing and Inspection/Programming and Relearning Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams Fuel Pump And Sender Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams > Page 6943 Fuel Level Sensor: Description and Operation FUEL LEVEL SENSOR The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor cord. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor, which changes resistance in correspondence to the amount of fuel in the fuel tank. The engine control module (ECM) sends the fuel level information via the class 2 circuit to the instrument panel cluster (IPC). This information is used for the instrument panel (I/P) fuel gage and the low fuel warning indicator, if applicable. The ECM also monitors the fuel level input for various diagnostics. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement Fuel Level Sensor: Service and Repair Fuel Sender Assembly Replacement FUEL SENDER ASSEMBLY REPLACEMENT TOOLS REQUIRED J 45722 Fuel Tank Sending Unit Wrench REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Remove the fuel feed (1) and EVAP (2) lines from the fuel sender assembly. 3. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. Turn the fuel sender lock ring in a counterclockwise direction. NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring. - Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints. IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 6946 4. Remove the fuel sender assembly (2) and seal (3). Discard the seal. 5. Clean the fuel sender sealing surfaces (4). CAUTION: Refer to Fuel Storage Caution. 6. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. IMPORTANT: Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped. - Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring. - Check the lock ring for flatness. 7. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement. 8. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 6947 1. Install a NEW seal (3) onto the fuel tank. IMPORTANT: Never reuse the old seal or a fuel leak may occur. Always use a NEW seal. 2. Install the fuel sender assembly (2). IMPORTANT: Place the fuel pump strainer in a horizontal position when you install the fuel sender in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm. 3. Use the J 45722 in order to install the fuel sender lock ring. Turn the fuel sender lock ring in a clockwise direction. IMPORTANT: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. Do not apply any type of lubrication in the seal groove. Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 6948 4. Install the fuel feed (1) and EVAP (2) lines to the sender assembly. 5. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 6949 Fuel Level Sensor: Service and Repair Fuel Level Sensor Replacement FUEL LEVEL SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel sender assembly. 2. Disconnect the fuel level sensor electrical connector (1). 3. Depress the fuel level sensor retaining tabs (2) to release the sensor from the sender assembly. 4. Remove the fuel level sensor electrical connector (1) and sensor (2) from the fuel sender assembly. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 6950 1. Install the fuel level sensor (2) and electrical connector (1) to the fuel sender assembly. 2. Connect the fuel level sensor electrical connector (1). 3. Ensure the fuel level sensor retaining tabs (2) are fully engaged. 4. Install the fuel sender assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations Fuel Tank Pressure Sensor: Locations Fuel Tank (Short Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 6954 Fuel Tank (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 6955 Fuel Tank Pressure (FTP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 6956 Fuel Tank Pressure Sensor: Description and Operation FUEL TANK PRESSURE SENSOR The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 6957 Fuel Tank Pressure Sensor: Service and Repair FUEL TANK PRESSURE SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Disconnect the fuel tank pressure sensor electrical connector. 3. Remove the fuel tank pressure sensor. INSTALLATION PROCEDURE 1. Install the fuel tank pressure sensor. 2. Connect the fuel tank pressure sensor electrical connector. 3. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Information Bus > Component Information > Testing and Inspection > Scan Tool Does Not Communicate with High Speed GMLAN Device Information Bus: Testing and Inspection Scan Tool Does Not Communicate with High Speed GMLAN Device SCAN TOOL DOES NOT COMMUNICATE WITH HIGH SPEED GMLAN DEVICE Modules connected to the high speed GMLAN serial data circuits monitor for serial data communications on the high speed GMLAN network during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module detects a bus-off condition, a DTC U2100 will be set. This DTC can be retrieved as history only. Diagnostic Aids The high speed GMLAN serial data bus uses two 120 ohm terminating resistors that are in parallel with the high speed GMLAN (+) and (-) circuits. One of the resistors is connected at the data link connector (DLC) and the other is at the engine control module (ECM). When testing for a short between high speed GMLAN (+) and (-), a reading of 60 ohms is normal. If the high speed GMLAN serial data is open, testing the resistance between high speed GMLAN (+) and (-) will read about 120 ohms. The engine will not start when there is a total malfunction of the high speed GMLAN serial data circuits while the engine is not running. The following conditions may cause a total loss of high speed GMLAN data communication: A short between high speed GMLAN (+) and high speed GMLAN (-) circuits - Any of the high speed GMLAN serial data circuits shorted to ground or voltage - A module internal malfunction that causes a short to voltage or ground on the high speed GMLAN circuits - Any of the high speed GMLAN serial data circuits open Test Description Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Information Bus > Component Information > Testing and Inspection > Scan Tool Does Not Communicate with High Speed GMLAN Device > Page 6962 Step 1 - Step 9 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Information Bus > Component Information > Testing and Inspection > Scan Tool Does Not Communicate with High Speed GMLAN Device > Page 6963 Step 10 - Step 13 The numbers below refer to the step numbers on the diagnostic table. 2. A partial malfunction in the high speed GMLAN serial data circuits uses a different procedure from a total malfunction of the high speed GMLAN data circuits. The following modules are connected to the high speed GMLAN serial data circuits: ECM, for 5.3L - Transmission control module (TCM) 5. Data link connector terminals 6 and 14 provide the connection to the GMLAN serial data high circuit and the GMLAN serial data low circuit respectively. 12. The communication malfunction may have prevented diagnosis of the customer complaint. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Information Bus > Component Information > Testing and Inspection > Scan Tool Does Not Communicate with High Speed GMLAN Device > Page 6964 Information Bus: Testing and Inspection Scan Tool Does Not Power Up SCAN TOOL DOES NOT POWER UP CIRCUIT DESCRIPTION The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following: Scan tool power battery positive voltage at terminal 16 - Scan tool power ground at terminal 4 - Common signal ground at terminal 5 The scan tool will power up with the ignition OFF. Some modules however, will not communicate unless the ignition is ON and the power mode master (PMM) module sends the appropriate power mode message. TEST DESCRIPTION Step 1 - Step 4 The number below refers to the step number on the diagnostic table. 4. If the battery positive voltage and ground circuits of the DLC are functioning properly, the malfunction must be due to the scan tool. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Locations > Page 6968 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6971 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6972 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6973 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6974 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6975 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6976 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6977 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6978 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6979 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6980 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6981 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6982 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6983 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6984 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6985 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6986 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6987 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6988 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6989 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6990 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6991 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6992 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6993 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6994 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6995 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6996 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6997 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6998 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 6999 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7000 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7001 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7002 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7003 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7004 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7005 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7006 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7007 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7008 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7009 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7010 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7011 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7012 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7013 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7014 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7015 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7016 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7017 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7018 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7019 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7020 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7021 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7022 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7023 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7024 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7025 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7026 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7027 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7028 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7029 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7030 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7031 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7032 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7033 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7034 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7035 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7036 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7037 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7038 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7039 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7040 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7041 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7042 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7043 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7044 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Page 7045 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 7048 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 7052 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Malfunction Indicator Lamp > Component Information > Description and Operation Malfunction Indicator Lamp: Description and Operation MALFUNCTION INDICATOR LAMP (MIL) OPERATION The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON: The MIL indicates that an emissions related fault has occurred and vehicle service is required. The following is a list of the modes of operation for the MIL: - The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate. - The MIL turns OFF after the engine is started if a diagnostic fault is not present. - The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate. - The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter. - When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON. - When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On Malfunction Indicator Lamp: Testing and Inspection Malfunction Indicator Lamp (MIL) Always On MALFUNCTION INDICATOR LAMP (MIL) ALWAYS ON CIRCUIT DESCRIPTION Battery positive voltage is supplied directly to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit. MIL OPERATION The MIL is located on the instrument panel (IPC). MIL FUNCTION - The MIL informs the driver that a malfunction has occurred and the vehicle should be taken in for service as soon as possible. - The MIL illuminates during a bulb test and a system test. - A DTC will be stored if a MIL is requested by the diagnostic. MIL ILLUMINATION - The MIL will illuminate with ignition switch ON and the engine not running. - The MIL will turn OFF when the engine is started. - The MIL will remain ON if the self-diagnostic system has detected a malfunction. - The MIL may turn OFF if the malfunction is not present. - If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated so long as the ignition switch is ON. - If the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition switch is cycled OFF, then ON. DIAGNOSTIC AIDS If the problem is intermittent, refer to Testing for Intermittent Conditions and Poor Connections. See: Testing and Inspection/Component Tests and General Diagnostics TEST DESCRIPTION Step 1 - Step 6 The number below refers to the step number on the diagnostic table. 2. This step determines if the condition is with the MIL control circuit or the ECM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On > Page 7058 Malfunction Indicator Lamp: Testing and Inspection Malfunction Indicator Lamp (MIL) Inoperative MALFUNCTION INDICATOR LAMP (MIL) INOPERATIVE CIRCUIT DESCRIPTION Ignition voltage is supplied to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit. There should be a steady MIL with the ignition ON and the engine OFF. MIL OPERATION The MIL is located on the instrument panel cluster (IPC). MIL FUNCTION - The MIL informs the driver that a malfunction has occurred and the vehicle should be taken in for service as soon as possible. - The MIL illuminates during a bulb test and a system test. - A DTC will be stored if a MIL is requested by the ECM. MIL ILLUMINATION - The MIL will illuminate with ignition switch ON and the engine not running. - The MIL will turn OFF when the engine is started. - The MIL will remain ON if the self-diagnostic system has detected a malfunction. - The MIL may turn OFF if the malfunction is not present. - If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated so long as the ignition switch is ON. - If the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition switch is cycled OFF, then ON. TEST DESCRIPTION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On > Page 7059 Step 1 - Step 14 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Malfunction Indicator Lamp > Component Information > Testing and Inspection > Malfunction Indicator Lamp (MIL) Always On > Page 7060 Step 15 The number below refers to the step number on the diagnostic table. 4. This step tests for a short to voltage on the MIL control circuit. With the fuse removed there should be no voltage on the MIL control circuit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations Upper Left Side Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 7064 Manifold Absolute Pressure (MAP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 7065 Manifold Pressure/Vacuum Sensor: Service and Repair MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield. 2. Disconnect the manifold absolute pressure (MAP) sensor electrical connector (3). 3. Remove the MAP sensor retaining clip (2) from the intake manifold. 4. Remove the MAP sensor (1) from the intake manifold. INSTALLATION PROCEDURE IMPORTANT: Lightly coat the MAP sensor seal with clean engine oil before installing the sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 7066 1. Install the MAP sensor (1). Push the MAP sensor into the intake manifold. 2. Install the MAP sensor retainer (2) to the intake manifold. 3. Connect the MAP sensor electrical connector (3). 4. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: Customer Interest Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 7075 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: All Technical Service Bulletins Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 7081 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 7082 Oil Pressure Sensor: Service and Repair Engine Oil Pressure Sensor and/or Switch Replacement ^ Tools Required J 41712 Oil Pressure Switch Socket Removal Procedure 1. Remove the intake manifold. 2. Disconnect the oil pressure sensor electrical connector (1). 3. Using J 41712 or equivalent, remove the oil pressure sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 7083 1. Apply sealant to the threads of the oil pressure sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Notice: Refer to Fastener Notice in Service Precautions. 2. Using J 41712 or equivalent, install the oil pressure sensor. ^ Tighten the sensor to 20 Nm (15 ft. lbs.). 3. Connect the oil pressure sensor electrical connector (1). 4. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Locations Below Rear Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions Oxygen Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7089 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7090 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7091 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7092 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7093 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7094 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7095 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7096 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7097 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7098 Oxygen Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7099 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7100 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7101 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7102 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7103 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7104 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7105 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7106 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7107 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7108 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7109 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7110 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7111 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7112 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7113 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7114 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7115 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7116 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7117 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7118 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7119 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7120 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7121 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7122 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7123 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7124 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7125 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7126 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7127 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7128 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7129 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7130 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7131 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7132 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7133 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7134 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7135 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7136 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7137 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7138 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7139 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7140 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7141 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7142 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7143 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7144 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7145 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7146 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7147 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7148 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7149 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7150 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7151 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7152 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7153 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7154 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7155 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7156 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7157 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7158 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7159 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7160 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7161 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7162 Oxygen Sensor: Connector Views Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7163 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7164 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7165 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (3). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7168 1. Connect the HO2S electrical connector (3). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7169 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector. 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7170 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector. 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7171 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (2). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7172 1. Connect the HO2S electrical connector (2). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7173 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector (1). 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7174 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector (1). 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Locations Body Control Module (BCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions Body Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7181 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7182 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7183 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7184 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7185 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7186 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7187 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7188 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7189 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7190 Body Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7191 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7192 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7193 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7194 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7195 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7196 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7197 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7198 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7199 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7200 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7201 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7202 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7203 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7204 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7205 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7206 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7207 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7208 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7209 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7210 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7211 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7212 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7213 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7214 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7215 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7216 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7217 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7218 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7219 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7220 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7221 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7222 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7223 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7224 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7225 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7226 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7227 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7228 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7229 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7230 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7231 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7232 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7233 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7234 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7235 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7236 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7237 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7238 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7239 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7240 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7241 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7242 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7243 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7244 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7245 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7246 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7247 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7248 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7249 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7250 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7251 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7252 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7253 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7254 Body Control Module: Connector Views Body Control Module (BCM) C1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7255 Body Control Module (BCM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7256 Body Control Module (BCM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7257 Body Control Module (BCM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7258 Body Control Module (BCM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7259 Body Control Module: Electrical Diagrams Door Control Module Diagrams Door Control Module Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7260 Door Control Module Diagram 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7261 Door Control Module Diagram 3 Locations: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Body Control System Diagrams Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7262 Body Control System Diagram 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7263 Body Control System Diagram 2 (1 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7264 Body Control System Diagram 3 (2 Of 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7265 Body Control System Diagram 4 (3 Of 3) Location: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. See: Locations Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System Body Control Module: Description and Operation Body Control System BODY CONTROL SYSTEM DESCRIPTION AND OPERATION BCM FUNCTIONS The body control module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be: Sensors and switches that are directly connected to the BCM - Class 2 serial data received from other control modules connected to the class 2 serial data link. The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message. The BCM controls these functions: Audible warnings-Refer to Audible Warnings Description and Operation in Instrument Panel, Gages and Console - Automatic door locks-Refer to Power Door Locks Description and Operation in Doors - Automatic headlamp control-Refer to Exterior Lighting Systems Description and Operation in Lighting Systems - Interior lighting-Refer to Interior Lighting Systems Description and Operation in Lighting Systems - Keyless entry (AUO option)-Refer to Keyless Entry System Description and Operation in Keyless Entry. - Passlock theft deterrent-Refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent. - Retained accessory power (RAP)-Refer to Retained Accessory Power (RAP) Description and Operation POWER MODE The BCM is the power mode master (PMM). Refer to Power Mode Description and Operation for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 7268 Body Control Module: Description and Operation Power Mode POWER MODE DESCRIPTION AND OPERATION SERIAL DATA POWER MODE On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition 0, Ignition 1, and Accessory. To determine the correct power mode the BCM uses: The state of these signals - The sequence of switch closures received by the BCM - The status of the engine run flag Correct Ignition Switch Inputs The chart indicates the power modes detected and transmitted by the BCM. FAIL-SAFE OPERATION Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the body control module (BCM) fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode. SERIAL DATA MESSAGES The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid BCM message until they receive the engine status from the powertrain control module (PCM). If the BCM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is true, indicating that the engine is running, the modules fail-safe to Run. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is false, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. DISCRETE IGNITION SIGNALS Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid BCM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, B+, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Description and Operation > Body Control System > Page 7269 Body Control Module: Description and Operation Retained Accessory Power (RAP) RETAINED ACCESSORY POWER (RAP) DESCRIPTION AND OPERATION SERIAL DATA CONTROL OF RETAINED ACCESSORY POWER (RAP) The class 2 modules receive the power mode message from the body control module (BCM) over the serial data circuits, indicating when the retained accessory power (RAP) power mode is current. The BCM monitors the ignition switch position, battery condition and passenger compartment doors status to determine whether RAP should be initiated. The modules then support the operation of the systems under their control as required by their RAP power mode operation. RAP will end when one of the following conditions is met: The BCM receives an input indicating the opening of any compartment door. - The BCM internal timer for the RAP expires after approximately 10 minutes. - The BCM detects a decrease in battery capacity below a prescribed limit. The BCM then sends a serial data power mode message Off-Awake ending the RAP function. The class 2 RAP functions are: The power windows - The entertainment devices - The DIC BCM/RELAY CONTROL OF RETAINED ACCESSORY POWER (RAP) The BCM keeps the RAP relay energized during all power modes, except Off-Awake. The devices powered through the RAP relay or controlled directly by BCM are: The rear vent windows - The sunroof The devices controlled by the BCM through the RAP supply voltage circuit are: The power roof module (PRM) - The mid-gate glass Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview Body Control Module: Initial Inspection and Diagnostic Overview DIAGNOSTIC STARTING POINT Begin the system diagnosis with Diagnostic System Check - Vehicle. The Diagnostic System Check - Vehicle will provide the following information: - The identification of the control modules which are not communicating. - The identification of any stored diagnostic trouble codes (DTCs) and their status. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin vehicle diagnosis. These must be performed before system DTC or symptom diagnosis. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 7272 Body Control Module: Symptom Related Diagnostic Procedures SYMPTOMS IMPORTANT: The following steps must be completed before using the symptom tables. 1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true: - There are no DTCs set. - The control modules can communicate via the serial data links. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures 2. Review the system operation in order to familiarize yourself with the system functions. Refer to: - Data Link Communications Description and Operation - Body Control System Description and Operation - Retained Accessory Power (RAP) Description and Operation Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the systems. - Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: - Scan Tool Does Not Power Up See: Information Bus/Testing and Inspection/Scan Tool Does Not Power Up - Scan Tool Does Not Communicate with High Speed GMLAN Device See: Information Bus/Testing and Inspection/Scan Tool Does Not Communicate with High Speed GMLAN Device - Power Mode Mismatch See: Starting and Charging/Testing and Inspection/Symptom Related Diagnostic Procedures/Power Mode Mismatch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement Body Control Module: Service and Repair Body Control Module Replacement BODY CONTROL MODULE REPLACEMENT REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. Do not open the BCM housing. The module does not have any serviceable components. The module may be replaced only as an assembly. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the 40-way body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 7275 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, remove the BCM (1) from the rear electrical center. INSTALLATION PROCEDURE 1. Index the slots on the BCM (1) to the rear electrical center. 2. Using a downward motion, install the BCM to the rear electrical center. 3. Connect the 24-way gray electrical connector (1) to the BCM. 4. Connect the 32-way tan electrical connector (2) to the BCM. 5. Connect the 40-way body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 7276 6. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 7. Install the rear electrical center cover. 8. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 9. If replacing the BCM on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 10. Connect the negative battery cable. 11. If installing a replacement BCM, program the BCM. Refer to Control Module References. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 7277 Body Control Module: Service and Repair Body Wiring Harness Extension Replacement - BCM BODY WIRING HARNESS EXTENSION REPLACEMENT - BCM REMOVAL PROCEDURE IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). - Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST. - Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST. - The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system. - Do not touch the exposed electrical contacts of the body wiring extension. 1. Disconnect the negative battery cable. CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 2. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. 3. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position. 4. Remove the rear electrical center cover. 5. Press down and hold the locking tab (1). 6. Disengage the sliding latch retaining the BCM to the rear electrical center.Slide the latch inboard until fully extended, approximately 40 mm (1.6 in). 7. Disconnect the body wiring extension (1) from the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 7278 8. Disconnect the 32-way tan electrical connector (2) from the BCM. 9. Disconnect the 24-way gray electrical connector (1) from the BCM. 10. With an upward motion, disconnect the body wiring extension (1) from the rear electrical center. 11. Remove the body wiring extension from the vehicle. INSTALLATION PROCEDURE 1. Using a downward motion, install the body wiring extension (1) to the rear electrical center. IMPORTANT: Ensure the sliding latch is fully extended before connecting the body wiring extension to the rear electrical center. 2. Connect the 24-way gray electrical connector (1) to the BCM. 3. Connect the 32-way tan electrical connector (2) to the BCM. 4. Connect the body wiring extension (1) to the BCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Body Control Module > Component Information > Service and Repair > Body Control Module Replacement > Page 7279 5. Engage the sliding latch fastening the BCM to the rear electrical center. Slide the latch outboard until the locking tab (1) is fully seated. 6. Install the rear electrical center cover. 7. If replacing the body wiring harness extension on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a passenger position. 8. If replacing the body wiring harness extension on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. 9. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage Engine Control Module: Technical Service Bulletins Engine Controls - Aftermarket Accessory Usage INFORMATION Bulletin No.: 04-06-04-054B Date: November 18, 2010 Subject: Info - Non-GM Parts and Accessories (Aftermarket) Models: 2011 and Prior GM Passenger Cars and Trucks Supercede: This bulletin is being revised to add model years and update to the new U.S. Fixed Operation Manager (FOM) and Canada Warranty Manager (WM) names. Please discard Corporate Bulletin Number 04-06-04-054A (Section 06 - Engine/Propulsion System). The recent rise and expansion of companies selling non-GM parts and accessories has made it necessary to issue this reminder to dealers regarding GM's policy on the use and installation of these aftermarket components. When a dealer is performing a repair under the New Vehicle Limited Warranty, they are required to use only genuine GM or GM-approved parts and accessories. This applies to all warranty repairs, special policy repairs or any repairs paid for by GM. Parts and accessories advertised as being "the same" as parts manufactured by GM, but not sold through GM, do not qualify for use in warranty repairs, special policy repairs or any repairs paid for by GM. During a warranty repair, if a GM original equipment part is not available through GM Customer Care and Aftersales (GM CC&A;), ACDelco(R) distributors, other GM dealers or approved sources, the dealer is to obtain comparable, non-GM parts and clearly indicate, in detail, on the repair order the circumstances surrounding why non-GM parts were used. The dealer must give customers written notice, prior to the sale or service, that such parts or accessories are not marketed or warranted by General Motors. It should also be noted that dealers modifying new vehicles and installing equipment, parts and accessories obtained from sources not authorized by GM are responsible for complying with the National Traffic and Motor Vehicle Safety Act. Certain non-approved parts or assemblies, installed by the dealer or its agent not authorized by GM, may result in a change to the vehicle's design characteristics and may affect the vehicle's ability to conform to federal law. Dealers must fully understand that non-GM approved parts may not have been validated, tested or certified for use. This puts the dealer at risk for potential liability in the event of a part or vehicle failure. If a GM part failure occurs as the result of the installation or use of a non-GM approved part, the warranty will not be honored. A good example of non-authorized modification of vehicles is the result of an ever increasing supply of aftermarket devices available to the customer, which claim to increase the horsepower and torque of the Duramax(TM) Diesel Engines. These include the addition of, but are not limited to one or more of the following modifications: - Propane injection - Nitrous oxide injection - Additional modules (black boxes) that connect to the vehicle wiring systems - Revised engine calibrations downloaded for the engine control module - Calibration modules which connect to the vehicle diagnostic connector - Modification to the engine turbocharger waste gate Although the installation of these devices, or modification of vehicle components, can increase engine horsepower and torque, they may also negatively affect the engine emissions, reliability and/or durability. In addition, other powertrain components, such as transmissions, universal joints, drive shafts, and front/rear axle components, can be stressed beyond design safety limits by the installation of these devices. General Motors does not support or endorse the use of devices or modifications that, when installed, increase the engine horsepower and torque. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Refer to the latest version of Bulletin 09-06-04-026 (V8 Gas Engines) or 06-06-01-007 (Duramax(TM) Diesel Engines) for more information on dealer requirements for calibration verification. These same policies apply as they relate to the use of non-GM accessories. Damage or failure from the use or installation of a non-GM accessory will not be covered under warranty. Failure resulting from the alteration or modification of the vehicle, including the cutting, welding or disconnecting of the vehicle's original equipment parts and components will void the warranty. Additionally, dealers will NOT be reimbursed or compensated by GM in the event of any legal inquiry at either the local, state or federal level that Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7284 results from the alteration or modification of a vehicle using non-GM approved parts or accessories. Dealers should be especially cautious of accessory companies that claim the installation of their product will not void the factory warranty. Many times these companies have even given direction on how to quickly disassemble the accessory in an attempt to preclude the manufacturer from finding out that is has been installed. Any suspect repairs should be reviewed by the Fixed Operations Manager (FOM), and in Canada by the Warranty Manager (WM) for appropriate repair direction. If it is decided that a goodwill repair is to be made on the vehicle, even with the installation of such non-GM approved components, the customer is to be made aware of General Motors position on this issue and is to sign the appropriate goodwill documentation required by General Motors. It is imperative for dealers to understand that by installing such devices, they are jeopardizing not only the warranty coverage, but also the performance and reliability of the customer's vehicle. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7285 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026C Date: August 13, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2011 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to the latest version of Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine , transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7286 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. Note All pictures must be sent as a.jpg file. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7287 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7288 Note All pictures must be sent as a.jpg file. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7289 Engine Control Module: Technical Service Bulletins Engine/Transmission - Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026B Date: April 07, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2010 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2010 model year and information about retrieving calibrations on a Global A vehicle. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7290 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7291 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7292 Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Engine Controls - Aftermarket Accessory Usage > Page 7293 Engine Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > Page 7294 Engine Control Module (ECM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions Engine Control Module: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7297 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7298 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7299 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7300 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7301 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7302 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7303 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7304 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7305 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7306 Engine Control Module: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7307 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7308 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7309 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7310 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7311 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7312 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7313 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7314 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7315 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7316 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7317 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7318 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7319 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7320 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7321 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7322 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7323 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7324 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7325 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7326 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7327 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7328 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7329 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7330 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7331 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7332 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7333 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7334 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7335 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7336 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7337 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7338 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7339 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7340 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7341 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7342 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7343 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7344 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7345 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7346 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7347 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7348 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7349 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7350 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7351 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7352 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7353 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7354 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7355 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7356 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7357 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7358 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7359 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7360 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7361 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7362 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7363 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7364 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7365 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7366 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7367 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7368 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7369 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7370 Engine Control Module: Connector Views Engine Control Module (ECM) C1 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7371 Engine Control Module (ECM) C1 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7372 Engine Control Module (ECM) C1 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7373 Engine Control Module (ECM) C2 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7374 Engine Control Module (ECM) C2 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7375 Engine Control Module (ECM) C2 (Part 3) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7376 Engine Control Module (ECM) C2 (Part 4) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7377 Engine Control Module (ECM) C3 (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 7378 Engine Control Module (ECM) C3 (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) Engine Control Module: Description and Operation Engine Control Module (ECM) ENGINE CONTROL MODULE (ECM) DESCRIPTION The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The engine control module (ECM) is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the ECM detects a malfunction, the ECM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM. Malfunction Indicator Lamp (MIL) Operation The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON: The MIL indicates that an emissions related fault has occurred and vehicle service is required. The following is a list of the modes of operation for the MIL: The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate. - The MIL turns OFF after the engine is started if a diagnostic fault is not present. - The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate. - The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter. - When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON. - When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 7381 Engine Control Module: Description and Operation Throttle Actuator Control (TAC) System ENGINE CONTROL MODULE The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Engine Control Module (ECM) > Page 7382 Engine Control Module: Description and Operation Electronic Ignition (EI) System ENGINE CONTROL MODULE (ECM) The engine control module (ECM) controls all ignition system functions, and constantly corrects the basic spark timing. The ECM monitors information from various sensor inputs that include the following: - The throttle position (TP) sensor - The engine coolant temperature (ECT) sensor - The mass air flow (MAF) sensor - The intake air temperature (IAT) sensor - The vehicle speed sensor (VSS) - The transmission gear position or range information sensors - The engine knock sensors (KS) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 7383 Engine Control Module: Service and Repair ENGINE CONTROL MODULE (ECM) REPLACEMENT Service of the engine control module (ECM) should consist of either replacement of the ECM or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM. The replacement ECM must be programmed. NOTE: - Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage. - Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery. - In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board. - Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module. - The replacement control module must be programmed. IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change. Removal Procedure 1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life. 2. Disconnect the negative battery cable. 3. Disconnect the cooling fan electrical connector for additional clearance while removing the ECM. 4. Depress the ECM/transmission control module (TCM) cover retainers (2). 5. Remove the ECM/TCM cover from the ECM/TCM bracket (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 7384 6. Disconnect the ECM electrical connectors (2) from the ECM (1). NOTE: Refer to Handling ESD Sensitive Parts Notice in Service Precautions. IMPORTANT: It is not necessary to disconnect the ECM electrical connectors in order to remove the ECM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. - Remove any debris from around the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM. 7. Release the bracket ECM retainers (1). 8. Tilt the ECM (2) away from the ECM/TCM bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 7385 9. Remove the ECM (2) from the ECM bracket (1). 10. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the TCM (1). 11. Remove the ECM/TCM bracket retaining bolts (2). 12. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 7386 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolts to 10 N.m (89 lb in). 4. If the TCM was previously removed from the ECM/TCM bracket (2), install the TCM (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 7387 5. Insert the ECM (2) into the retaining slots of the ECM/TCM bracket (1). 6. Secure the ECM (2) to the ECM/TCM mounting bracket ensuring the ECM retaining tabs (1) are fully engaged. 7. Connect the ECM electrical connectors (2) to the ECM (1) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Page 7388 12. If the ECM was replaced the replacement ECM must be programmed. See: Testing and Inspection/Programming and Relearning Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Relays and Modules Computers and Control Systems > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 7392 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse - If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 7397 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 7398 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 7399 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Accelerator Pedal Position Sensor > Component Information > Locations > Page 7400 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7406 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7407 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7408 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7409 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7410 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7411 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7412 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7413 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7414 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7415 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7416 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7417 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7418 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7419 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7420 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7421 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7422 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7423 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7424 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7425 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7426 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7427 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7428 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7429 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7430 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7431 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7432 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7433 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7434 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7435 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7436 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7437 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7438 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7439 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7440 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7441 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7442 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7443 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7444 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7445 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7446 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7447 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7448 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7449 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7450 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7451 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7452 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7453 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7454 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7455 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7456 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7457 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7458 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7459 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7460 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7461 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7462 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7463 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7464 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7465 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7466 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7467 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7468 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7469 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7470 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7471 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7472 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7473 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7474 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7475 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7476 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7477 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7478 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7479 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 7480 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 7481 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 7482 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7488 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7489 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7490 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7491 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7492 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7493 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7494 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7495 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7496 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7497 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7498 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7499 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7500 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7501 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7502 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7503 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7504 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7505 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7506 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7507 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7508 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7509 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7510 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7511 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7512 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7513 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7514 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7515 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7516 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7517 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7518 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7519 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7520 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7521 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7522 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7523 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7524 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7525 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7526 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7527 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7528 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7529 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7530 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7531 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7532 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7533 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7534 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7535 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7536 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7537 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7538 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7539 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7540 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7541 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7542 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7543 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7544 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7545 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7546 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7547 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7548 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7549 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7550 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7551 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7552 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7553 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7554 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7555 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7556 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7557 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7558 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7559 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7560 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7561 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 7562 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 7563 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Camshaft Position Sensor > Component Information > Diagrams > Page 7564 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): Customer Interest Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7573 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7574 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7575 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Customer Interest for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7576 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins Engine - MIL ON P0116/P1400 Set In Very Cold Temps TECHNICAL Bulletin No.: 10-06-04-008A Date: January 24, 2011 Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord) Models: 2006-2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2006-2010 Cadillac Escalade 2006-2007 Chevrolet Monte Carlo 2006-2009 Chevrolet Impala SS, TrailBlazer 2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe 2006-2009 GMC Envoy 2006-2010 GMC Savana, Sierra, Yukon 2006-2008 Pontiac Grand Prix 2006-2009 Saab 9-7X Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6 Please Refer to GMVIS Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. Supercede: This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System). Condition Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder. The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History. Cause This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range. Correction Important DO NOT replace the ECM for this condition. Relocating the ECT Sensor 1. Turn ON the ignition with the engine OFF. 2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI. ‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3. ‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI. 3. Turn OFF the ignition. Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7582 under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot. 4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator. 5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI. 7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator. 8. Remove the end of the lower radiator hose from the radiator. 9. Drain the engine coolant sufficiently below the level of the ECT sensor. 10. Close the radiator drain cock or connect the lower radiator hose at the radiator. 11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose. 12. Lower the vehicle. 13. Disconnect the wiring harness connector from the ECT sensor (2). 14. Remove the ECT sensor (1) from the front of the cylinder head. 15. Remove the corresponding size plug at the rear of the OTHER cylinder head. 16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 17. Install the ECT sensor in the hole of the cylinder head where the plug was removed. Tighten Tighten to 20 Nm (15 lb ft). 18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent. 19. Install the plug in the hole of the cylinder head where the ECT sensor was removed Tighten Tighten to 20 Nm (15 lb ft). Important Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7583 20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring. 21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit. Note This step is to set up and verify the length of wiring that is required before cutting. 22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required. 23. Cut the ECT sensor jumper wires to the appropriate length. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. Note Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector. 25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI. 26. Connect the ECT sensor harness connector to the ECT sensor. 27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps. Important You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed. 28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI. 29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI. 30. Use a scan tool to clear any DTCs. Relocating the Engine Coolant Heater Cord Important For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above. 1. Turn OFF the ignition. 2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length. 3. Obtain an extension cord with the following features: - 120 volt - 14/3 gauge - 15A capacity - Three prong - Polarized plug and receptacle - Chemical resistant - Grounded terminals - Designed for use in a cold outdoor environment - Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight - Maximum length of 2.5-3 m (8-10 ft) 4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning. 5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent. 6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7584 7. Wrap electrical tape around the connection as shown. 8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown. 9. Continue to route the extension cord to the exit location desired by the customer as shown. 10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it. 11. Secure the engine coolant heater cord and the extension cord with tie straps as needed. 12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length. Part Information The extension cord may be obtained at any of the following outlets: - Lowes* - Home Depot* - Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10 USA: Cords should bear the UL symbol. Canada: Cords should bear the ULc symbol or CSA approval. *We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Coolant Temperature Sensor/Switch (For Computer): > 10-06-04-008A > Jan > 11 > Engine - MIL ON P0116/P1400 Set In Very Cold Temps > Page 7585 Warranty Information (excluding Saab Models) For vehicles repaired under the 5 year / 100,000 mile (160,000 km) emission warranty, use: Warranty Information (Saab Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 7586 Engine Coolant Temperature (ECT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 7587 Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Turn OFF the ignition. NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. 4. Lower the vehicle. 5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1). 6. Remove the ECT sensor. INSTALLATION PROCEDURE 1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. - Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Page 7588 2. Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the sensor to 20 N.m (15 lb ft). 3. Connect the ECT sensor electrical connector (1). 4. Refill the engine coolant. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2) in Cooling System. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7594 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7595 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7596 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7597 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7598 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7599 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7600 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7601 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7602 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7603 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7604 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7605 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7606 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7607 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7608 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7609 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7610 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7611 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7612 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7613 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7614 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7615 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7616 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7617 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7618 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7619 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7620 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7621 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7622 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7623 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7624 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7625 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7626 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7627 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7628 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7629 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7630 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7631 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7632 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7633 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7634 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7635 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7636 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7637 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7638 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7639 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7640 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7641 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7642 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7643 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7644 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7645 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7646 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7647 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7648 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7649 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7650 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7651 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7652 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7653 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7654 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7655 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7656 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7657 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7658 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7659 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7660 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7661 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7662 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7663 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7664 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7665 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7666 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7667 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Diagrams > Page 7668 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 7671 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 7672 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams Fuel Pump And Sender Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Diagrams > Page 7676 Fuel Level Sensor: Description and Operation FUEL LEVEL SENSOR The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor cord. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor, which changes resistance in correspondence to the amount of fuel in the fuel tank. The engine control module (ECM) sends the fuel level information via the class 2 circuit to the instrument panel cluster (IPC). This information is used for the instrument panel (I/P) fuel gage and the low fuel warning indicator, if applicable. The ECM also monitors the fuel level input for various diagnostics. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement Fuel Level Sensor: Service and Repair Fuel Sender Assembly Replacement FUEL SENDER ASSEMBLY REPLACEMENT TOOLS REQUIRED J 45722 Fuel Tank Sending Unit Wrench REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Remove the fuel feed (1) and EVAP (2) lines from the fuel sender assembly. 3. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. Turn the fuel sender lock ring in a counterclockwise direction. NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring. - Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints. IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 7679 4. Remove the fuel sender assembly (2) and seal (3). Discard the seal. 5. Clean the fuel sender sealing surfaces (4). CAUTION: Refer to Fuel Storage Caution. 6. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. IMPORTANT: Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped. - Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring. - Check the lock ring for flatness. 7. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement. 8. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 7680 1. Install a NEW seal (3) onto the fuel tank. IMPORTANT: Never reuse the old seal or a fuel leak may occur. Always use a NEW seal. 2. Install the fuel sender assembly (2). IMPORTANT: Place the fuel pump strainer in a horizontal position when you install the fuel sender in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm. 3. Use the J 45722 in order to install the fuel sender lock ring. Turn the fuel sender lock ring in a clockwise direction. IMPORTANT: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. Do not apply any type of lubrication in the seal groove. Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 7681 4. Install the fuel feed (1) and EVAP (2) lines to the sender assembly. 5. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 7682 Fuel Level Sensor: Service and Repair Fuel Level Sensor Replacement FUEL LEVEL SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel sender assembly. 2. Disconnect the fuel level sensor electrical connector (1). 3. Depress the fuel level sensor retaining tabs (2) to release the sensor from the sender assembly. 4. Remove the fuel level sensor electrical connector (1) and sensor (2) from the fuel sender assembly. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Level Sensor > Component Information > Service and Repair > Fuel Sender Assembly Replacement > Page 7683 1. Install the fuel level sensor (2) and electrical connector (1) to the fuel sender assembly. 2. Connect the fuel level sensor electrical connector (1). 3. Ensure the fuel level sensor retaining tabs (2) are fully engaged. 4. Install the fuel sender assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations Fuel Tank Pressure Sensor: Locations Fuel Tank (Short Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 7687 Fuel Tank (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 7688 Fuel Tank Pressure (FTP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 7689 Fuel Tank Pressure Sensor: Description and Operation FUEL TANK PRESSURE SENSOR The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Fuel Tank Pressure Sensor > Component Information > Locations > Page 7690 Fuel Tank Pressure Sensor: Service and Repair FUEL TANK PRESSURE SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Disconnect the fuel tank pressure sensor electrical connector. 3. Remove the fuel tank pressure sensor. INSTALLATION PROCEDURE 1. Install the fuel tank pressure sensor. 2. Connect the fuel tank pressure sensor electrical connector. 3. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 7694 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 7695 Intake Air Temperature Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 7696 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Intake Air Temperature Sensor > Component Information > Locations > Page 7697 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Locations > Page 7701 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7704 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7705 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7706 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7707 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7708 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7709 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7710 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7711 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7712 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7713 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7714 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7715 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7716 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7717 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7718 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7719 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7720 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7721 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7722 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7723 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7724 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7725 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7726 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7727 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7728 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7729 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7730 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7731 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7732 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7733 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7734 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7735 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7736 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7737 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7738 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7739 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7740 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7741 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7742 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7743 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7744 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7745 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7746 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7747 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7748 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7749 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7750 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7751 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7752 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7753 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7754 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7755 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7756 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7757 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7758 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7759 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7760 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7761 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7762 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7763 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7764 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7765 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7766 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7767 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7768 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7769 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7770 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7771 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7772 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7773 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7774 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7775 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7776 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7777 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Diagrams > Page 7778 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 7781 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations Upper Left Side Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 7785 Manifold Absolute Pressure (MAP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 7786 Manifold Pressure/Vacuum Sensor: Service and Repair MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield. 2. Disconnect the manifold absolute pressure (MAP) sensor electrical connector (3). 3. Remove the MAP sensor retaining clip (2) from the intake manifold. 4. Remove the MAP sensor (1) from the intake manifold. INSTALLATION PROCEDURE IMPORTANT: Lightly coat the MAP sensor seal with clean engine oil before installing the sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Manifold Pressure/Vacuum Sensor > Component Information > Locations > Page 7787 1. Install the MAP sensor (1). Push the MAP sensor into the intake manifold. 2. Install the MAP sensor retainer (2) to the intake manifold. 3. Connect the MAP sensor electrical connector (3). 4. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: Customer Interest Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Customer Interest for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 7796 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks Oil Pressure Sensor: All Technical Service Bulletins Engine - Low Oil Lamp ON/Oil Leaks TECHNICAL Bulletin No.: 07-06-01-004A Date: November 25, 2008 Subject: All Vortec(R) GEN IV V8 Engines - LY2 LS4 LC9 LH6 LMG LY5 LS2 L76 LY6 L92 LS7, Low Oil Level Indicator Lamp On and/or Engine Oil Leak (Reseal Oil Pressure Sensor) Models Supercede: This bulletin is being updated to include a labor operation number for CTS-V and Corvette models. Please discard Please discard Corporate Bulletin Number 07-06-01-004 (Section 06 Engine/Propulsion System). Condition Some customers may comment on a low oil level indicator lamp on and/or engine oil leak. Upon further investigation, the technician may find that the oil leak is at the oil pressure sensor that is threaded into the valve lifter oil manifold (VLOM) assembly and/or engine valley cover. Correction If the engine oil leak was found to be at the engine oil pressure sensor, then remove the oil pressure sensor and reseal with a pipe sealant with Teflon or equivalent, P/N 12346004 (in Canada, P/N 10953480). Refer to Engine Oil Pressure Sensor and/or Switch Replacement in SI. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Oil Pressure Sensor: > 07-06-01-004A > Nov > 08 > Engine - Low Oil Lamp ON/Oil Leaks > Page 7802 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 7803 Oil Pressure Sensor: Service and Repair Engine Oil Pressure Sensor and/or Switch Replacement ^ Tools Required J 41712 Oil Pressure Switch Socket Removal Procedure 1. Remove the intake manifold. 2. Disconnect the oil pressure sensor electrical connector (1). 3. Using J 41712 or equivalent, remove the oil pressure sensor. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oil Pressure Sensor > Component Information > Technical Service Bulletins > Page 7804 1. Apply sealant to the threads of the oil pressure sensor. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Notice: Refer to Fastener Notice in Service Precautions. 2. Using J 41712 or equivalent, install the oil pressure sensor. ^ Tighten the sensor to 20 Nm (15 ft. lbs.). 3. Connect the oil pressure sensor electrical connector (1). 4. Install the intake manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Locations Below Rear Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions Oxygen Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7810 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7811 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7812 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7813 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7814 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7815 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7816 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7817 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7818 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7819 Oxygen Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7820 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7821 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7822 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7823 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7824 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7825 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7826 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7827 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7828 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7829 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7830 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7831 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7832 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7833 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7834 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7835 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7836 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7837 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7838 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7839 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7840 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7841 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7842 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7843 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7844 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7845 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7846 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7847 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7848 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7849 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7850 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7851 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7852 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7853 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7854 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7855 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7856 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7857 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7858 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7859 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7860 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7861 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7862 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7863 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7864 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7865 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7866 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7867 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7868 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7869 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7870 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7871 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7872 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7873 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7874 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7875 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7876 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7877 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7878 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7879 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7880 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7881 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7882 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7883 Oxygen Sensor: Connector Views Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7884 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7885 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7886 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (3). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7889 1. Connect the HO2S electrical connector (3). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7890 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector. 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7891 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector. 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7892 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 1 REMOVAL PROCEDURE 1. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. - Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. 2. Remove the catalytic converter. 3. Remove the connector position assurance (CPA) retainer. 4. Disconnect the heated oxygen sensor (HO2S) electrical connector (2). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7893 1. Connect the HO2S electrical connector (2). 2. Install the CPA retainer. 3. Install the catalytic converter. 4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 5. Install the HO2S (2). IMPORTANT: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter. Tighten the sensor to 42 N.m (31 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7894 Oxygen Sensor: Service and Repair Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 2 SENSOR 2 REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Remove the connector position assurance (CPA) retainer. NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions. 3. Disconnect the heated oxygen sensor (HO2S) electrical connector (1). 4. Remove the HO2S (2). NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Oxygen Sensor > Component Information > Service and Repair > Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 > Page 7895 1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent. IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation. NOTE: Refer to Component Fastener Tightening Notice in Service Precautions. 2. Install the HO2S (2). Tighten the sensor to 42 N.m (31 lb ft). 3. Connect the HO2S electrical connector (1). 4. Install the CPA retainer. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7900 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7901 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7902 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7903 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7904 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7905 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7906 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7907 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7908 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7909 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7910 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7911 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7912 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7913 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7914 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7915 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7916 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7917 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7918 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7919 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7920 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7921 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7922 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7923 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7924 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7925 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7926 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7927 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7928 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7929 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7930 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7931 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7932 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7933 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7934 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7935 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7936 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7937 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7938 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7939 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7940 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7941 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7942 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7943 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7944 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7945 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7946 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7947 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7948 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7949 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7950 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7951 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7952 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7953 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7954 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7955 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7956 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7957 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7958 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7959 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7960 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7961 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7962 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7963 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7964 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7965 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7966 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7967 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7968 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7969 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7970 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7971 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7972 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 7976 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 7977 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 7978 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 7979 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams Vehicle Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Vehicle Speed Sensor Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Sensors and Switches Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams > Page 7983 Vehicle Speed Sensor: Service and Repair Vehicle Speed Sensor (VSS) Replacement Removal Procedure 1. Remove the harness connector. 2. Remove the bolt (2). 3. Remove the vehicle speed sensor (1). 4. Remove the O-ring seal (3). Installation Procedure 1. Install the O-ring seal (3) on the vehicle speed sensor (1). 2. Coat the O-ring seal (3) with a thin film of transmission fluid. 3. Install the vehicle speed sensor (1) into the transmission case. 4. Install the bolt (2). Tighten the bolt to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 5. Connect the wiring harness electrical connector to the vehicle speed sensor. 6. Refill the fluid as required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7988 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7989 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7990 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7991 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7992 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7993 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7994 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7995 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7996 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7997 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7998 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 7999 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8000 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8001 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8002 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8003 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8004 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8005 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8006 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8007 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8008 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8009 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8010 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8011 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8012 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8013 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8014 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8015 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8016 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8017 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8018 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8019 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8020 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8021 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8022 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8023 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8024 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8025 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8026 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8027 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8028 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8029 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8030 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8031 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8032 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8033 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8034 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8035 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8036 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8037 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8038 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8039 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8040 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8041 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8042 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8043 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8044 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8045 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8046 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8047 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8048 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8049 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8050 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8051 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8052 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8053 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8054 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8055 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8056 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8057 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8058 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8059 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8060 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 8064 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 8065 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 8066 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 8067 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams Vehicle Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Vehicle Speed Sensor Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Computers and Control Systems > Vehicle Speed Sensor > Component Information > Diagrams > Page 8071 Vehicle Speed Sensor: Service and Repair Vehicle Speed Sensor (VSS) Replacement Removal Procedure 1. Remove the harness connector. 2. Remove the bolt (2). 3. Remove the vehicle speed sensor (1). 4. Remove the O-ring seal (3). Installation Procedure 1. Install the O-ring seal (3) on the vehicle speed sensor (1). 2. Coat the O-ring seal (3) with a thin film of transmission fluid. 3. Install the vehicle speed sensor (1) into the transmission case. 4. Install the bolt (2). Tighten the bolt to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 5. Connect the wiring harness electrical connector to the vehicle speed sensor. 6. Refill the fluid as required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Catalytic Converter > Catalyst Shield > Component Information > Service and Repair Catalyst Shield: Service and Repair Catalytic Converter Heat Shield Replacement Removal Procedure 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the 5 bolts securing the heat shield to the floor panel studs. 3. Remove the heat shield from the vehicle. Installation Procedure 1. Place the catalytic converter heat shield onto the floor panel studs. 2. Notice: Secure the heat shield with the 5 bolts. ^ Tighten the catalytic converter heat shield bolts to 7 Nm (62 inch lbs.). 3. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Canister Purge Solenoid > Component Information > Locations Upper Left Side Of The Engine Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Canister Purge Solenoid > Component Information > Locations > Page 8081 Evaporative Emission (EVAP) Canister Purge Solenoid Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Canister Purge Solenoid > Component Information > Locations > Page 8082 Canister Purge Solenoid: Description and Operation EVAP PURGE SOLENOID VALVE The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when commanded ON by the control module. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Canister Purge Solenoid > Component Information > Locations > Page 8083 Canister Purge Solenoid: Service and Repair EVAPORATIVE EMISSION (EVAP) CANISTER PURGE SOLENOID VALVE REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield. 2. Disconnect the evaporative emission (EVAP) pipes (1 and 2) from the EVAP purge solenoid. 3. Disconnect the EVAP purge solenoid electrical connector. 4. Remove the EVAP purge solenoid (1) from the fuel rail. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Canister Purge Solenoid > Component Information > Locations > Page 8084 1. Install the EVAP purge solenoid (1) to the fuel rail. 2. Connect the EVAP purge solenoid electrical connector. 3. Connect the EVAP pipes (1 and 2) to the EVAP purge solenoid. 4. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emission Control Canister > Canister Vent Valve > Component Information > Locations Canister Vent Valve: Locations Fuel Tank (Short Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emission Control Canister > Canister Vent Valve > Component Information > Locations > Page 8089 Fuel Tank (Long Wheel Base) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emission Control Canister > Canister Vent Valve > Component Information > Locations > Page 8090 Evaporative Emission (EVAP) Canister Vent Solenoid Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emission Control Canister > Canister Vent Valve > Component Information > Locations > Page 8091 Canister Vent Valve: Description and Operation EVAP VENT SOLENOID VALVE The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module commands the valve ON, closing the valve during some EVAP tests, allowing the system to be tested for leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emission Control Canister > Canister Vent Valve > Component Information > Locations > Page 8092 Canister Vent Valve: Service and Repair EVAPORATIVE EMISSION (EVAP) CANISTER VENT SOLENOID VALVE REPLACEMENT REMOVAL PROCEDURE 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 2. Disconnect the evaporative emission (EVAP) canister vent valve electrical connector (2). 3. Disconnect the EVAP vent pipe from the canister vent valve. 4. Disengage the bracket retaining tab and remove the EVAP canister vent valve. INSTALLATION PROCEDURE 1. Install the EVAP canister vent valve onto the bracket. 2. Inspect for proper retention of the EVAP vent valve on the bracket. 3. Connect the EVAP vent pipe to the EVAP canister vent valve. 4. Connect the EVAP canister vent valve electrical connector (2). 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emissions Hose > Component Information > Service and Repair > Evaporative Emission (EVAP) Hoses/Pipes Replacement - Chassis Evaporative Emissions Hose: Service and Repair Evaporative Emission (EVAP) Hoses/Pipes Replacement - Chassis EVAPORATIVE EMISSION (EVAP) HOSES/PIPES REPLACEMENT - CHASSIS REMOVAL PROCEDURE 1. Remove the evaporative emission (EVAP)/fuel hose/pipe assembly. 2. Remove the EVAP purge pipe (1) from the fuel hose/pipe (2). INSTALLATION PROCEDURE 1. Install the EVAP purge pipe (1) to the fuel hose/pipe (2). 2. Install the EVAP/fuel hose/pipe assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emissions Hose > Component Information > Service and Repair > Evaporative Emission (EVAP) Hoses/Pipes Replacement - Chassis > Page 8097 Evaporative Emissions Hose: Service and Repair Evaporative Emission (EVAP) Hoses/Pipes Replacement - Engine EVAPORATIVE EMISSION (EVAP) HOSES/PIPES REPLACEMENT - ENGINE REMOVAL PROCEDURE IMPORTANT: Clean the tube connections and surrounding areas before disconnecting in order to avoid possible evaporative emission (EVAP) system contamination. 1. Remove the intake manifold sight shield. 2. Disconnect the EVAP pipe (1) from the intake manifold and the EVAP canister purge solenoid. 3. Disconnect the EVAP pipe (2) from the EVAP canister purge solenoid and the chassis EVAP pipe. 4. Cap the Intake manifold port, the EVAP canister purge solenoid and the chassis EVAP pipe in order to prevent possible EVAP system contamination. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative Emissions Hose > Component Information > Service and Repair > Evaporative Emission (EVAP) Hoses/Pipes Replacement - Chassis > Page 8098 1. Remove the caps from the Intake manifold port, the EVAP canister purge solenoid and the chassis EVAP pipe. 2. Connect the EVAP pipe (2) to the EVAP canister purge solenoid and the chassis EVAP pipe. 3. Connect the EVAP pipe (1) to the intake manifold and the EVAP canister purge solenoid. 4. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Evaporative System Service Port > Component Information > Description and Operation Evaporative System Service Port: Description and Operation EVAP SERVICE PORT The EVAP service port is located in the EVAP purge pipe between the EVAP canister purge solenoid valve and the EVAP canister. The service port is identified by a green-colored cap. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Evaporative Emissions System > Refueling Vapor Recovery System > System Information > Description and Operation Refueling Vapor Recovery System: Description and Operation ON-BOARD REFUELING VAPOR RECOVERY SYSTEM (ORVR) The On-Board Refueling Vapor Recovery System (ORVR) is an on-board vehicle system designed to recover fuel vapors during the vehicle refueling operation. The flow of liquid fuel down the fuel filler pipe provides a liquid seal which prevents vapor from leaving the fuel filler pipe. An evaporative emission (EVAP) pipe transports the fuel vapor to the EVAP canister for use by the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Positive Crankcase Ventilation > PCV Valve Hose > Component Information > Service and Repair PCV Valve Hose: Service and Repair Crankcase Ventilation Hoses/Pipes Replacement Removal Procedure 1. Remove the intake manifold sight shield. 2. Remove the positive crankcase ventilation (PCV) foul air hose from the intake manifold and valve rocker arm cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Emission Control Systems > Positive Crankcase Ventilation > PCV Valve Hose > Component Information > Service and Repair > Page 8109 3. Remove the PCV fresh air hose (2) from the valve rocker arm cover (1). Installation Procedure 1. Install the PCV fresh air hose (2) to the valve rocker arm cover (1). 2. Install the PCV foul air hose to the intake manifold and valve rocker arm cover. 3. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure > System Information > Specifications Fuel Pressure: Specifications Fuel Pressure (Key ON, Engine OFF).................................................................................................. ..............................................385-425 kPa (55-62 psi) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal Fuel Pressure: Testing and Inspection Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 8116 Fuel Pressure: Testing and Inspection Fuel System Diagnosis FUEL SYSTEM DIAGNOSIS SYSTEM DESCRIPTION The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON. The fuel system is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions. The fuel tank stores the fuel supply. An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times. TEST Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 8117 Step 1 - Step 5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 8118 Step 6 - Step 13 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure Fuel Pressure Release: Service and Repair Fuel Pressure Relief Procedure FUEL PRESSURE RELIEF PROCEDURE TOOLS REQUIRED J 34730-1A Fuel Pressure Gage 1. Disconnect the negative battery cable. 2. Install J 34730-1A. 3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure. 4. Open the valve on J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing. 5. Drain any fuel remaining in the gage into an approved container. 6. Once the system pressure is completely relieved, remove J 34730-1A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure > Page 8123 Fuel Pressure Release: Service and Repair Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Idle Speed > System Information > Specifications Idle Speed: Specifications Information not supplied by the manufacturer. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8130 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8131 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8132 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8133 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: Customer Interest Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Customer Interest: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 8143 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON Air Filter Element: All Technical Service Bulletins Engine, A/T - Shift/Driveability Concerns/MIL ON Bulletin No.: 04-07-30-013B Date: February 01, 2007 INFORMATION Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter Models: 2007 and Prior GM Cars and Light Duty Trucks 2007 and Prior Saturn Models 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 - Transmission/Transaxle). The use of an excessively/over-oiled aftermarket, reusable air filter may result in: Service Engine Soon (SES) light on Transmission shift concerns, slipping and damaged clutch(es) or band(s) Engine driveability concerns, poor acceleration from a stop, limited engine RPM range The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur. When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over-oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern. The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty. If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs. Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 04-07-30-013B > Feb > 07 > Engine, A/T - Shift/Driveability Concerns/MIL ON > Page 8149 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 08-05-22-002C > Apr > 09 > Brakes - Squeak Noise On Brake Pedal Application Brake Fluid: All Technical Service Bulletins Brakes - Squeak Noise On Brake Pedal Application TECHNICAL Bulletin No.: 08-05-22-002C Date: April 07, 2009 Subject: Squeak Noise On Brake Apply (Remove Brake Fluid from Master Cylinder and Refill) Models: 2004-2007 Buick Rainier 2008 Buick Enclave 2004-2008 Chevrolet Colorado, TrailBlazer, TrailBlazer EXT, TrailBlazer SS 2008 Chevrolet Malibu 2009 Chevrolet Malibu (VIN position 11, 4 Orion MI. build with Build Date Prior to April 20, 2009) 2004-2008 GMC Canyon, Envoy, Envoy XL, Envoy XUV 2007-2008 GMC Acadia 2008 Pontiac G6 2009 Pontiac G6 (VIN position 11, 4 Orion MI. build with Build Date Prior to April 20, 2009) 2007-2008 Saturn OUTLOOK 2008 Saturn AURA 2005-2008 Saab 9-7X Supercede: This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 08-05-22-002B (Section 05 - Brakes). Condition Some customers may comment on a squeak noise when the brake pedal is applied or when released. This noise is normally heard when the brake pedal is slowly applied with the engine on or off, but can occur when the brake pedal is released. The noise may be isolated to the master cylinder area. Correction To correct this concern, remove as much of the old brake fluid from the master cylinder as possible and refill with a new DOT 3 brake fluid, P/N 88862806 (in Canada, use P/N 88862807). Start the vehicle and fully cycle the brake pedal until the noise diminishes to allow the new fluid to enter the system. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table above. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 08-05-22-002C > Apr > 09 > Brakes - Squeak Noise On Brake Pedal Application > Page 8155 For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > All Other Service Bulletins for Air Filter Element: > 08-05-22-002C > Apr > 09 > Brakes - Squeak Noise On Brake Pedal Application > Page 8161 For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 8162 Air Filter Element: Service and Repair AIR CLEANER ELEMENT REPLACEMENT REMOVAL PROCEDURE 1. Remove the air cleaner outlet duct. 2. Disconnect the mass air flow (MAF) / intake air temperature (IAT) sensor electrical connector (1). 3. Remove the radiator support diagonal brace. 4. Loosen the 4 air cleaner cover retaining screws (1). 5. Remove the air cleaner housing cover (2). Lift and rotate the cover in order to remove the cover from the vehicle. 6. Remove the air filter element (6) and the MAF/IAT sensor (3) from the lower air cleaner housing/washer solvent tank assembly (4). 7. Separate the air filter element (6) from the MAF/IAT sensor (3). 8. Inspect the entire assembly for dust, debris, or water. Clean or replace as necessary. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Cleaner Housing > Air Filter Element > Component Information > Technical Service Bulletins > Page 8163 1. Install the MAF/IAT sensor (3) to the air filter element (6). 2. Install the air filter element (6) and MAF/IAT sensor (3) to the lower air cleaner housing/washer solvent tank assembly (4). 3. Install the air cleaner cover (2) and secure with 4 retaining screws (1). NOTE: Refer to Fastener Notice. IMPORTANT: Ensure the air inlet duct (5) is properly positioned in the lower air cleaner housing/washer solvent tank assembly (4) before installing the air cleaner cover (2). Tighten the screws to 4 N.m (35 lb in). 4. Install the radiator support diagonal brace. 5. Connect the MAF/IAT sensor electrical connector (1). 6. Install the air cleaner outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8169 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8170 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8171 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8172 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8173 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8174 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8175 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8176 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8177 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8178 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8179 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8180 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8181 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8182 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8183 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8184 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8185 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8186 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8187 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8188 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8189 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8190 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8191 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8192 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8193 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8194 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8195 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8196 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8197 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8198 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8199 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8200 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8201 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8202 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8203 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8204 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8205 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8206 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8207 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8208 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8209 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8210 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8211 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8212 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8213 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8214 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8215 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8216 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8217 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8218 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8219 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8220 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8221 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8222 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8223 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8224 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8225 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8226 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8227 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8228 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8229 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8230 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8231 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8232 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8233 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8234 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8235 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8236 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8237 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8238 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8239 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8240 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8241 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8242 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 8243 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 8244 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 8245 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) Fuel: Technical Service Bulletins Fuel System - TOP TIER Detergent Gasoline (Canada) INFORMATION Bulletin No.: 05-06-04-022G Date: October 27, 2010 Subject: TOP TIER Detergent Gasoline Information and Available Brands (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns) - Canada ONLY Models: 2011 and Prior GM Passenger Cars and Trucks (Canada Only) Supercede: This bulletin is being revised to update the model years and include an additional gasoline brand as a TOP TIER source. Please discard Corporate Bulletin Number 05-06-04-022F (Section 06 - Engine/Propulsion System). In the U.S., refer to the latest version of Corporate Bulletin Number 04-06-04-047I. A new class of fuel called TOP TIER Detergent Gasoline is appearing at retail stations of some fuel marketers. This gasoline meets detergency standards developed by six automotive companies. All vehicles will benefit from using TOP TIER Detergent Gasoline over gasoline containing the "Lowest Additive Concentration" recommended by the Canadian General Standards Board (CGSB). Those vehicles that have experienced deposit related concerns may especially benefit from use of TOP TIER Detergent Gasoline. Intake valve: 16,093 km (10,000 mi) with TOP TIER Detergent Gasoline Intake valve: 16,093 km (10,000 mi) with Minimum Additive recommended by the CGSB Top Tier Fuel Availability Chevron was the first to offer TOP TIER Detergent Gasoline in Canada. Shell became the first national gasoline retailer to offer TOP TIER Detergent Gasoline across Canada. Petro-Canada began offering TOP TIER Detergent Gasoline nationally as of October 1, 2006. Sunoco began offering TOP TIER Detergent Gasoline in March of 2007. Esso began offering TOP TIER Detergent Gasoline in May of 2010. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) > Page 8250 Gasoline Brands That Currently Meet TOP TIER Detergent Gasoline Standards The following gasoline brands meet the TOP TIER Detergent Gasoline Standards in all octane grades : Chevron Canada (markets in British Columbia and western Alberta) - Shell Canada (nationally) - Petro-Canada (nationally) - Sunoco-Canada (Ontario) - Esso-Canada (nationally) What is TOP TIER Detergent Gasoline? TOP TIER Detergent Gasoline is a new class of gasoline with enhanced detergency and no metallic additives. It meets new, voluntary deposit control standards developed by six automotive companies that exceed the detergent recommendations of Canadian standards and does not contain metallic additives, which can damage vehicle emission control components. Where Can TOP TIER Detergent Gasoline Be Purchased? The TOP TIER program began in the U.S. and Canada on May 3, 2004. Some fuel marketers have already joined and introduced TOP TIER Detergent Gasoline. This is a voluntary program and not all fuel marketers will offer this product. Once fuel marketers make public announcements, they will appear on a list of brands that meet the TOP TIER standards. Who developed TOP TIER Detergent Gasoline standards? TOP TIER Detergent Gasoline standards were developed by six automotive companies: BMW, General Motors, Honda, Toyota, Volkswagen and Audi. Why was TOP TIER Detergent Gasoline developed? TOP TIER Detergent Gasoline was developed to increase the level of detergent additive in gasoline. In the U.S., government regulations require that all gasoline sold in the U.S. contain a detergent additive. However, the requirement is minimal and in many cases, is not sufficient to keep engines clean. In Canada, gasoline standards recommend adherence to U.S. detergency requirements but do not require it. In fact, many brands of gasoline in Canada do not contain any detergent additive. In order to meet TOP TIER Detergent Gasoline standards, a higher level of detergent is needed than what is required or recommended, and no metallic additives are allowed. Also, TOP TIER was developed to give fuel marketers the opportunity to differentiate their product. Why did the six automotive companies join together to develop TOP TIER? All six corporations recognized the benefits to both the vehicle and the consumer. Also, joining together emphasized that low detergency and the intentional addition of metallic additives is an issue of concern to several automotive companies. What are the benefits of TOP TIER Detergent Gasoline? TOP TIER Detergent Gasoline will help keep engines cleaner than gasoline containing the "Lowest Additive Concentration" recommended by Canadian standards. Clean engines help provide optimal fuel economy and engine performance, and also provide reduced emissions. Also, the use of TOP TIER Detergent Gasoline will help reduce deposit related concerns. Who should use TOP TIER Detergent Gasoline? All vehicles will benefit from using TOP TIER Detergent Gasoline over gasoline containing the "Lowest Additive Concentration" recommended by Canadian standards. Those vehicles that have experienced deposit related concerns may especially benefit from use of TOP TIER Detergent Gasoline. More information on TOP TIER Detergent Gasoline can be found at this website, http://www.toptiergas.com/. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) > Page 8251 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) > Page 8252 Fuel: Technical Service Bulletins Fuel System - 'TOP TIER' Detergent Gasoline Information INFORMATION Bulletin No.: 04-06-04-047I Date: August 17, 2009 Subject: TOP TIER Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns) - U.S. Only Models: 2010 and Prior GM Passenger Cars and Trucks (including Saturn) (U.S. Only) 2003-2010 HUMMER H2 (U.S. Only) 2006-2010 HUMMER H3 (U.S. Only) 2005-2009 Saab 9-7X (U.S. Only) Supercede: This bulletin is being revised to add model years and additional sources to the Top Tier Fuel Retailers list. Please discard Corporate Bulletin Number 04-06-04-047H (Section 06 Engine/Propulsion System). In Canada, refer to Corporate Bulletin Number 05-06-04-022F. A new class of fuel called TOP TIER Detergent Gasoline is appearing at retail stations of some fuel marketers. This gasoline meets detergency standards developed by six automotive companies. All vehicles will benefit from using TOP TIER Detergent Gasoline over gasoline containing the "Lowest Additive Concentration" set by the EPA. Those vehicles that have experienced deposit related concerns may especially benefit from the use of TOP TIER Detergent Gasoline. Intake valve: - 10,000 miles with TOP TIER Detergent Gasoline Intake valve: - 10,000 miles with Legal Minimum additive Gasoline Brands That Currently Meet TOP TIER Detergent Gasoline Standards As of August 1, 2009, all grades of the following gasoline brands meet the TOP TIER Detergent Gasoline Standards: - Chevron - Chevron-Canada - QuikTrip - Conoco Phillips 66 - 76 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) > Page 8253 - Shell - Shell-Canada - Entec Stations located in the greater Montgomery, Alabama area. - MFA Oil Company located throughout Missouri. - Kwik Trip, Inc. in Minnesota and Wisconsin and Kwik Star convenience stores in Iowa. The Somerset Refinery, Inc. at Somerset Oil stations in Kentucky. Aloha Petroleum - Tri-Par Oil Company - Turkey Hill Minit Markets - Texaco - Petro-Canada - Sunoco-Canada - Road Ranger located in Illinois, Indiana, Iowa, Kentucky, Missouri, Ohio and Wisconsin What is TOP TIER Detergent Gasoline? TOP TIER Detergent Gasoline is a new class of gasoline with enhanced detergency. It meets new, voluntary deposit control standards developed by six automotive companies that exceed the detergent requirements imposed by the EPA. Where Can TOP TIER Detergent Gasoline Be Purchased? The TOP TIER program began on May 3, 2004 and many fuel marketers have joined the program and have introduced TOP TIER Detergent Gasoline. This is a voluntary program and not all fuel marketers will offer this product. Once fuel marketers make public announcements, they will appear on a list of brands that meet the TOP TIER standards. Where Can I find the Latest Information on TOP TIER Fuel and Retailers? On the web, please visit www.toptiergas.com for additional information and updated retailer lists. Who developed TOP TIER Detergent Gasoline standards? TOP TIER Detergent Gasoline standards were developed by six automotive companies: Audi, BMW, General Motors, Honda, Toyota and Volkswagen. Why was TOP TIER Detergent Gasoline developed? TOP TIER Detergent Gasoline was developed to increase the level of detergent additive in gasoline. The EPA requires that all gasoline sold in the U.S. contain a detergent additive. However, the requirement is minimal and in many cases, is not sufficient to keep engines clean. In order to meet TOP TIER Detergent Gasoline standards, a higher level of detergent is needed than what is required by the EPA. Also, TOP TIER was developed to give fuel marketers the opportunity to differentiate their product. Why did the six automotive companies join together to develop TOP TIER? All six corporations recognized the benefits to both the vehicle and the consumer. Also, joining together emphasized that low detergency is an issue of concern to several automotive companies. What are the benefits of TOP TIER Detergent Gasoline? TOP TIER Detergent Gasoline will help keep engines cleaner than gasoline containing the "Lowest Additive Concentration" set by the EPA. Clean engines help provide optimal fuel economy and performance and reduced emissions. Also, use of TOP TIER Detergent Gasoline will help reduce deposit related concerns. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) > Page 8254 Fuel: Technical Service Bulletins Fuel System - E85 Fuel Usage Precautions Bulletin No.: 05-06-04-035C Date: July 30, 2007 INFORMATION Subject: Usage of E85 Fuels in GM Vehicles Models: 1997-2008 GM Passenger Cars and Trucks (including Saturn) 2003-2008 HUMMER H2 2006-2008 HUMMER H3 1997-2008 Isuzu NPR Commercial Medium Duty Trucks 2005-2008 Saab 9-7X Supercede: This bulletin is being revised to add the 2008 model year and additional engines with E85 capability. Please discard Corporate Bulletin Number 05-06-04-035B (Section 06 Engine/Propulsion System). Customer Interest in E85 Fuel As the retail price of gasoline increases, some locations in the country are seeing price differentials between regular gasoline and E85 where E85 is selling for substantially less than regular grade gasoline. One result of this is that some customers have inquired if they are able to use E85 fuel in non-E85 compatible vehicles. Only vehicles designated for use with E85 should use E85 blended fuel. E85 compatibility is designated for vehicles that are certified to run on up to 85% ethanol and 15% gasoline. All other gasoline engines are designed to run on fuel that contains no more than 10% ethanol. Use of fuel containing greater than 10% ethanol in non-E85 designated vehicles can cause driveability issues, service engine soon indicators as well as increased fuel system corrosion. Using E85 Fuels in Non-Compatible Vehicles General Motors is aware of an increased number of cases where customers have fueled non-FlexFuel designated vehicles with E85. Fueling non-FlexFuel designated vehicles with E85, or with fuels where the concentration of ethanol exceeds the ASTM specification of 10%, will result in one or more of the following conditions: Lean Driveability concerns such as hesitations, sags and/or possible stalling. SES lights due to OBD codes. Fuel Trim codes P0171 and/or P0174. Misfire codes (P0300). Various 02 sensor codes. Disabled traction control or Stability System disabled messages. Harsh/Firm transmission shifts. Fuel system and/or engine mechanical component degradation. Use of fuel containing greater than 10% ethanol in non-E85 designated vehicles can cause driveability issues, service engine soon indicators as well as increased fuel system corrosion. If the dealer suspects that a non-FlexFuel designated vehicle brought in for service has been fueled with E85, the fuel in the vehicle's tank should be checked for alcohol content with tool J 44175. If the alcohol content exceeds 10% the fuel should be drained and the vehicle refilled with gasoline - preferably one of the Top Tier brands. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) > Page 8255 Repairs to non-FlexFuel vehicles that have been fueled with E85 are not covered under the terms of the New Vehicle Warranty. A complete list of GM's FlexFuel vehicles can be found in this Service Bulletin, or at www.livegreengoyellow.com. E85 Compatible Vehicles The only E85 compatible vehicles produced by General Motors are shown. Only vehicles that are listed in the E85 Compatible Vehicles section of this bulletin and/or www.livegreengoyellow.com are E85 compatible. All other gasoline and diesel engines are NOT E85 compatible. Use of fuel containing greater than 10% ethanol in non-E85 designated vehicles can cause driveability issues, service engine soon indicators as well as increased fuel system corrosion. Repairs to non-FlexFuel vehicles that have been fueled with E85 are not covered under the terms of the New Vehicle Warranty. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Fuel System - TOP TIER Detergent Gasoline (Canada) > Page 8256 Fuel: Technical Service Bulletins Fuel System - E85 Refueling Station Information Bulletin No.: 06-06-04-030 Date: May 15, 2006 INFORMATION Subject: Locations of E85 Refueling Stations and Expanded E85 Information Models: 2007 and Prior GM Cars and Trucks Equipped for Flexible Fuel (E85) Attention: U.S. dealers - This bulletin should be directed to the Sales Manager as well as the Service Manager. Copies of this bulletin may be given to customers purchasing or considering the purchase of E85 capable vehicles, and may be left or posted in customer waiting areas. Canadian dealers - This bulletin is intended for the U.S. Market and provides only limited information relevant to the Canadian market. Customer Questions, Concerns and Refueling Locations for E85 Fuel Extensive information on E85 Ethanol based fuels can be found at www.livegreengoyellow.com . This General Motors site contains vital information that anticipates and answers customer questions and concerns about E85 fuel. Part of the information is a useful link that provides the location nationally of all E85 refueling stations. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Technical Service Bulletins > Page 8257 Fuel: Specifications GASOLINE OCTANE Use premium unleaded gasoline with a posted octane rating of 91 or higher. You may also use regular unleaded gasoline rated at 87 octane or higher, but your vehicle's acceleration may be slightly reduced, and you may notice a slight audible knocking noise, commonly referred to as spark knock. If the octane is less than 87, you may notice a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you might damage your engine. If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, your engine needs service. GASOLINE SPECIFICATIONS It is recommended that gasoline meet specifications which were developed by automobile manufacturers around the world and contained in the World-Wide Fuel Charter which is available from the Alliance of Automobile Manufacturers at www.autoalliance.org/fuel_charter.htm. Gasoline meeting these specifications could provide improved driveability and emission control system performance compared to other gasoline. CALIFORNIA FUEL If your vehicle is certified to meet California Emission Standards, it is designed to operate on fuels that meet California specifications. See the underhood emission control label. If this fuel is not available in states adopting California emissions standards, your vehicle will operate satisfactorily on fuels meeting federal specifications, but emission control system performance may be affected. The malfunction indicator lamp may turn on and your vehicle may fail a smog-check test. If it is determined that the condition is caused by the type of fuel used, repairs may not be covered by your warranty. ADDITIVES To provide cleaner air, all gasolines in the United States are now required to contain additives that will help prevent engine and fuel system deposits from forming, allowing your emission control system to work properly. In most cases, you should not have to add anything to your fuel. However, some gasolines contain only the minimum amount of additive required to meet U.S. Environmental Protection Agency regulations. General Motors recommends that you buy gasolines that are advertised to help keep fuel injectors and intake valves clean. If your vehicle experiences problems due to dirty injectors or valves, try a different brand of gasoline. Also, your GM dealer has additives that will help correct and prevent most deposit-related problems. Gasolines containing oxygenates, such as ethers and ethanol, and reformulated gasolines may be available in your area to contribute to clean air. General Motors recommends that you use these gasolines, particularly if they comply with the specifications described earlier. NOTICE: Your vehicle was not designed for fuel that contains methanol. Do not use fuel containing methanol. It can corrode metal parts in your fuel system and also damage the plastic and rubber parts. That damage would not be covered under your warranty. Some gasolines that are not reformulated for low emissions may contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask the attendant where you buy gasoline whether the fuel contains MMT. General Motors does not recommend the use of such gasolines. Fuels containing MMT can reduce the life of spark plugs and the performance of the emission control system may be affected. The malfunction indicator lamp may turn on. FUELS IN FOREIGN COUNTRIES If you plan on driving in another country outside the United States or Canada, the proper fuel may be hard to find. Never use leaded gasoline or any other fuel not recommended in the previous text on fuel. Costly repairs caused by use of improper fuel would not be covered by your warranty. To check the fuel availability, ask an auto club, or contact a major oil company that does business in the country where you will be driving. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Testing and Inspection > Without Special Tool Fuel: Testing and Inspection Without Special Tool ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS (WITHOUT SPECIAL TOOL) DESCRIPTION Water contamination in the fuel system may cause driveability conditions such as hesitation, stalling, no start, or misfires in one or more cylinders. Water may collect near a single fuel injector at the lowest point in the fuel injection system, and cause a misfire in that cylinder. If the fuel system is contaminated with water, inspect the fuel system components for rust or deterioration. Ethanol concentrations of greater than 10 percent can cause driveability conditions and fuel system deterioration. Fuel with more than 10 percent ethanol could result in driveability conditions such as hesitation, lack of power, stalling, or no start. Excessive concentrations of ethanol used in vehicles not designed for it may cause fuel system corrosion, deterioration of rubber components, and fuel filter restriction. TEST PROCEDURE 1. Test the fuel composition using J 44175 Fuel Composition Tester and J 44175-3 Instruction Manual. 2. If water appears in the fuel sample, perform the following steps: 1. Clean the fuel system. Refer to Fuel System Cleaning. See: Service and Repair 2. Replace the fuel filter if the vehicle is equipped with a serviceable fuel filter. Fuel Composition Test Examples 3. Subtract 50 from the reading on the DMM in order to obtain the percentage of alcohol in the fuel sample. Refer to the examples in the Fuel Composition Test Examples table. 4. If the fuel sample contains more than 15 percent ethanol, add fresh, regular gasoline to the vehicle's fuel tank. 5. Test the fuel composition. 6. If testing shows the ethanol percentage is still more than 15 percent, replace the fuel in the vehicle. Refer to Fuel System Cleaning. See: Service and Repair Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel > Component Information > Testing and Inspection > Without Special Tool > Page 8260 Fuel: Testing and Inspection With Special Tool ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS (WITH SPECIAL TOOL) DESCRIPTION Water contamination in the fuel system may cause driveability conditions such as hesitation, stalling, no start, or misfires in one or more cylinders. Water may collect near a single fuel injector at the lowest point in the fuel injection system, and cause a misfire in that cylinder. If the fuel system is contaminated with water, inspect the fuel system components for rust, or deterioration. Alcohol concentrations of 10 percent or greater in fuel can be detrimental to fuel system components. Alcohol contamination may cause fuel system corrosion, deterioration of rubber components, and subsequent fuel filter restriction. Some types of alcohol are more detrimental to fuel system components than others. Ethanol is commonly used in gasoline, but in concentrations of no more than 10 percent. Some fuels, such as E85, contain a very high percentage of ethanol. Fuel with more than 10 percent ethanol may cause driveability conditions such as hesitation, lack or power, stalling, or no start. ALCOHOL IN FUEL TESTING PROCEDURE The fuel sample should be drawn from the bottom of the tank so that any water present in the tank will be detected. The sample should be bright and clear. If alcohol contamination is suspected then use the following procedure to test the fuel quality. 1. Using a 100 ml specified cylinder with 1 ml graduation marks, fill the cylinder with fuel to the 90 ml mark. 2. Add 10 ml of water in order to bring the total fluid volume to 100 ml and install a stopper. 3. Shake the cylinder vigorously for 10-15 seconds. 4. Carefully loosen the stopper in order to release the pressure. 5. Re-install the stopper and shake the cylinder vigorously again for 10-15 seconds. 6. Put the cylinder on a level surface for approximately 5 minutes in order to allow adequate liquid separation. If alcohol is present in the fuel, the volume of the lower layer, which would now contain both alcohol and water, will be more than 10 ml. For example, if the volume of the lower layer is increased to 15 ml, this indicates at least 5 percent alcohol in the fuel. The actual amount of alcohol may be somewhat more because this procedure does not extract all of the alcohol from the fuel. PARTICULATE CONTAMINANTS IN FUEL TESTING PROCEDURE The fuel sample should be drawn from the bottom of the tank so that any water present in the tank will be detected. The sample should be bright and clear. If the sample appears cloudy, or contaminated with water, as indicated by a water layer at the bottom of the sample, use the following procedure to diagnose the fuel. 1. Using an approved fuel container, draw approximately 0.5 liter of fuel. 2. Place the cylinder on a level surface for approximately 5 minutes in order to allow settling of the particulate contamination. Particulate contamination will show up in various shapes and colors. Sand will typically be identified by a white or light brown crystals. Rubber will appear as black and irregular particles. If particles are found clean the entire fuel system thoroughly. Refer to Fuel System Cleaning. See: Service and Repair Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Filler Cap > Component Information > Description and Operation Fuel Filler Cap: Description and Operation FUEL FILLER CAP The fuel fill pipe has a tethered fuel filler cap. A torque-limiting device prevents the cap from being over tightened. To install the cap, turn the cap clockwise until you hear clicks. This indicates that the cap is correctly torqued and fully seated. A built-in device indicates that the fuel filler cap is fully seated. A fuel filler cap that is not fully seated may cause a malfunction in the emission system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure Fuel Pressure Release: Service and Repair Fuel Pressure Relief Procedure FUEL PRESSURE RELIEF PROCEDURE TOOLS REQUIRED J 34730-1A Fuel Pressure Gage 1. Disconnect the negative battery cable. 2. Install J 34730-1A. 3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure. 4. Open the valve on J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing. 5. Drain any fuel remaining in the gage into an approved container. 6. Once the system pressure is completely relieved, remove J 34730-1A. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Filter > Fuel Pressure Release > System Information > Service and Repair > Fuel Pressure Relief Procedure > Page 8269 Fuel Pressure Release: Service and Repair Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > Customer Interest: > 03-06-04-030G > Apr > 09 > Fuel System - Driveability Issues/MIL/Multiple DTC's Fuel Injector: Customer Interest Fuel System - Driveability Issues/MIL/Multiple DTC's TECHNICAL Bulletin No.: 03-06-04-030G Date: April 22, 2009 Subject: Various Driveability Symptoms Due to Clogged Fuel Injectors, MIL/SES DTCs P0171, P0172, P0174, P0300, P1174, P1175 (Clean Fuel Injectors and/or Perform Injector Test With AFIT CH-47976) Models: 2005-2009 GM Passenger Cars and Light Duty Trucks 2005-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7X Equipped with Engine RPOs listed in the Table above and MULTEC(R) 2 Fuel Injectors Attention: GM does not support cleaning injectors on any engines that are not listed in this bulletin. Engines other than the ones listed in this bulletin that diagnosis indicates having restricted injectors should have those injectors replaced. Supercede: This bulletin is being revised to update the model year to 2009 and to provide applicable engine RPO table. Please discard Corporate Bulletin Number 03-06-04-030F (Section 06 - Engine/Propulsion System). Condition Some customers may comment on any of the following various driveability symptoms: - Extended Crank Time - Hard to Start - MIL/SES Illuminated with DTCs - Hesitation - Lack of Power - Surge or Chuggle - Rough Idle - Light or Intermittent Misfire Cause Due to various factors, the fuel injectors may become restricted. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. The restriction causes the engine to operate at a lean air fuel ratio. This may either trigger the MIL to illuminate or the engine to develop various driveability symptoms. Correction Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > Customer Interest: > 03-06-04-030G > Apr > 09 > Fuel System - Driveability Issues/MIL/Multiple DTC's > Page 8278 Fuel injector restrictions, deposits can be cleaned on the vehicle using the following procedure. Under NO circumstances should this procedure be modified, changed or shortened. As a long term solution, and to prevent reoccurrence, customers should be encouraged to use Top Tier Detergent Gasoline. For further information on Top Tier detergent gasoline and fuel retailers, please refer to the following Corporate Bulletin Numbers: - 04-06-04-047G (U.S. Only) - 05-06-04-022D (Canada ONLY) Notice GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent approved for use with General Motors fuel system components. Other injector cleaners may cause damage to plastics, plated metals or bearings. General Motors has completed extensive laboratory testing of GM Upper Engine and Fuel Injector Cleaner, and can assure its compatibility with General Motors fuel system components, as long as the cleaning procedure is followed correctly. Injector Cleaning Procedure The following tools, or their equivalent, are required: - CH-47976 Active Fuel Injector Tester (AFIT) - J 35800-A Fuel Injector Cleaner - J 37287 Fuel Line Shut-off Adapter - J 42964 Fuel Line Shut-off Adapter - J 42873 Fuel Line Shut-off Adapter - * One bottle of GM Upper Engine and Fuel Injector Cleaner, P/N 88861802 (in Canada, P/N 88861804) - * One bottle of GM Fuel System Treatment Plus, P/N 88861011 (in Canada, P/N 88861012) Active Fuel Injector Tester (AFIT- CH-47976) Some dealers may not have an Active Fuel Injector Tester (AFIT- CH-47976). Dealers can contact to order an AFIT- CH-47976. Dealers still can test the fuel injectors without an AFIT. Refer to Fuel Injector Diagnosis (w/ J 39021 or Tech 2(R)) in SI. Important As mentioned in the AFIT User Guide, vehicles that are not listed in the AFIT menu can still be tested with the AFIT. Depending on the model, it may be possible to enter the previous model year and proceed with testing using the DLC connection. If this is not possible on the model that you are working on, it will be necessary to use the direct connection method outlined in the AFIT User Guide (See Pages 17-31). General Motors recommends that the Active Fuel Injector Tester (AFIT) be used in testing fuel injectors. If the SI diagnostics do not isolate a cause for this concern, use the Active Fuel Injector Tester (AFIT - CH-47976) to perform an "Injector Test" as outlined in the AFIT User Guide. The AFIT "Injector Test" measures the flow characteristics of all fuel injectors, which is more precise when compared with the standard Tech 2(R) fuel injector balance test. As a result, the AFIT is more likely to isolate the cause of a P1174 DTC (for example: if it is being caused by a fuel injector concern). The CH-47976 (Active Fuel Injector Tester - AFIT) can also be used to measure fuel pressure and fuel system leak down. Also, as mentioned in the P1174 SI diagnosis, if the misfire current counters or misfire graph indicate any misfires, it may be an indicator of the cylinder that is causing the concern. Refer to Fuel Injector Diagnosis (w/CH-47976) in SI for additional instructions. Training (U.S.) To access the training video on AFIT, take the following path at the GM Training Website: 1. After logging into the training website, choose the link on the left side of the page titled "web video library." 2. Then choose "technical." 3. Next, within the search box, type in September course number "10206.09D. 4. This will bring up a link with this course. Scroll through to choose "feature topic." 5. At this point, the seminar can be chosen to view or the video related to the AFIT. Additional training is available from the training website. Please see TECHassist 16044.18T2 Active Fuel Injector Tester and also see 16044.14D1 GM Powertrain Performance for more information on GM Upper Engine and Fuel Injector Cleaner. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > Customer Interest: > 03-06-04-030G > Apr > 09 > Fuel System - Driveability Issues/MIL/Multiple DTC's > Page 8279 Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE). Training (Canada) To access the training video on AFIT, take the following path at the GMPro LMS Training Website: 1. After logging into the website, choose the link on the left side of the page titled "Catalog." 2. Then choose "Catalog Search." 3. Next, within the search box, Select Course Number - Contains - "T" then select search. 4. This will bring up a list of TECHassist courses. Scroll through to choose "Active Fuel Injector Tester" and select "View." 5. At this point, a new window will open and the program can be Launched. Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE). Techlink Additional information can be found on AFIT (June 2006 Edition) and GM Upper Engine and Fuel Injector Cleaner (November 2006 Edition) in Techlink. To access the articles, take the following path: 1. Go to GM DealerWorld (U.S.) or the GM GlobalConnect (Canada). 2. Click on the Service Tab in DealerWorld (in Canada, click Technican Resources in the Service Library of GM GlobalConnect). 3. Click on the GM Techlink Hyperlink. 4. Click on the Archives Hyperlink at GM Techlink. - Click on 06-2006 in the Archives Section and Click on the Active Fuel Injector Tester Link in the June 2006 Techlink Article. - Click on 11-2006 in the Archives Section and Click on the GM Top Engine Cleaner Replaced Link in the November 2006 Techlink Article. Injector Cleaning Procedure Notice GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent recommended. DO NOT USE OTHER CLEANING AGENTS AS THEY MAY CONTAIN METHANOL, WHICH CAN DAMAGE FUEL SYSTEM COMPONENTS. Under NO circumstances should the GM Upper Engine and Fuel Injector Cleaner be added to the vehicle fuel tank. Do not exceed the recommended cleaning solution concentration. Testing has demonstrated that exceeding the recommended cleaning solution concentration does not improve the effectiveness of this procedure. Important Vehicles with less than 160 km (100 mi) on the odometer should not have the injectors cleaned. These vehicles should have any out of specification injectors replaced. 1. For 4, 5 and 6 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A - Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) mixed with 420 ml (14 oz) of regular unleaded gasoline. 2. For 8 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline. This procedure will need to be repeated for a second time for an 8 cylinder engine (8 cylinder engines receive 960 ml total fluid 120 ml (4 oz) of Upper Engine and Fuel Injector Cleaner and 840 ml (28 oz) of gasoline. 3. Be sure to follow all additional instructions provided with the tool. 4. Electrically disable the vehicle fuel pump by either removing the fuel pump fuse or the fuel pump relay and disconnecting the oil pressure switch connector, if equipped. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > Customer Interest: > 03-06-04-030G > Apr > 09 > Fuel System - Driveability Issues/MIL/Multiple DTC's > Page 8280 5. Turn the ignition to the OFF position. 6. Relieve fuel pressure and disconnect the fuel feed and return lines at the fuel rail. Plug the fuel feed and return lines coming off the fuel rail with J 37287, J 42873 or J 42964 as appropriate for the fuel system. 7. Connect the J 35800-A to the vehicle fuel rail. 8. Pressurize the J 35800-A to 510 kPa (75 psi). 9. Start and idle the engine until it stalls, due to lack of fuel. This should take approximately 15-20 minutes. 10. Turn the ignition to the OFF position. 11. Disconnect the J 35800-A from the fuel rail. 12. Reconnect the vehicle fuel pump relay and oil pressure switch connector, if equipped. 13. Remove the J 37287, J 42873 or J 42964 and reconnect the vehicle fuel feed and return lines. 14. Start and idle the vehicle for an additional two minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines. 15. Pour the entire contents of GM Fuel System Treatment Plus (P/N 88861011 [in Canada, P/N 88861012]) into the tank and advise the customer to fill the tank. 16. Review the benefits of using Top Tier Detergent gasoline with the customer and recommend that they add a bottle of GM Fuel System Treatment Plus to the fuel tank at every oil change. Regular use of GM Fuel System Treatment Plus should keep the customer from having to repeat the injector cleaning procedure. 17. Road test the vehicle to verify that the customer concern has been corrected. Parts Information * Only 1/8 of the cost may be claimed for 4 and 6 cylinder engines and 1/4 of the cost for 8 cylinder engines. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table above. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > Customer Interest: > 03-06-04-030G > Apr > 09 > Fuel System - Driveability Issues/MIL/Multiple DTC's > Page 8281 For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 03-06-04-030G > Apr > 09 > Fuel System Driveability Issues/MIL/Multiple DTC's Fuel Injector: All Technical Service Bulletins Fuel System - Driveability Issues/MIL/Multiple DTC's TECHNICAL Bulletin No.: 03-06-04-030G Date: April 22, 2009 Subject: Various Driveability Symptoms Due to Clogged Fuel Injectors, MIL/SES DTCs P0171, P0172, P0174, P0300, P1174, P1175 (Clean Fuel Injectors and/or Perform Injector Test With AFIT CH-47976) Models: 2005-2009 GM Passenger Cars and Light Duty Trucks 2005-2009 HUMMER H2 2006-2009 HUMMER H3 2005-2009 Saab 9-7X Equipped with Engine RPOs listed in the Table above and MULTEC(R) 2 Fuel Injectors Attention: GM does not support cleaning injectors on any engines that are not listed in this bulletin. Engines other than the ones listed in this bulletin that diagnosis indicates having restricted injectors should have those injectors replaced. Supercede: This bulletin is being revised to update the model year to 2009 and to provide applicable engine RPO table. Please discard Corporate Bulletin Number 03-06-04-030F (Section 06 - Engine/Propulsion System). Condition Some customers may comment on any of the following various driveability symptoms: - Extended Crank Time - Hard to Start - MIL/SES Illuminated with DTCs - Hesitation - Lack of Power - Surge or Chuggle - Rough Idle - Light or Intermittent Misfire Cause Due to various factors, the fuel injectors may become restricted. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. The restriction causes the engine to operate at a lean air fuel ratio. This may either trigger the MIL to illuminate or the engine to develop various driveability symptoms. Correction Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 03-06-04-030G > Apr > 09 > Fuel System Driveability Issues/MIL/Multiple DTC's > Page 8287 Fuel injector restrictions, deposits can be cleaned on the vehicle using the following procedure. Under NO circumstances should this procedure be modified, changed or shortened. As a long term solution, and to prevent reoccurrence, customers should be encouraged to use Top Tier Detergent Gasoline. For further information on Top Tier detergent gasoline and fuel retailers, please refer to the following Corporate Bulletin Numbers: - 04-06-04-047G (U.S. Only) - 05-06-04-022D (Canada ONLY) Notice GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent approved for use with General Motors fuel system components. Other injector cleaners may cause damage to plastics, plated metals or bearings. General Motors has completed extensive laboratory testing of GM Upper Engine and Fuel Injector Cleaner, and can assure its compatibility with General Motors fuel system components, as long as the cleaning procedure is followed correctly. Injector Cleaning Procedure The following tools, or their equivalent, are required: - CH-47976 Active Fuel Injector Tester (AFIT) - J 35800-A Fuel Injector Cleaner - J 37287 Fuel Line Shut-off Adapter - J 42964 Fuel Line Shut-off Adapter - J 42873 Fuel Line Shut-off Adapter - * One bottle of GM Upper Engine and Fuel Injector Cleaner, P/N 88861802 (in Canada, P/N 88861804) - * One bottle of GM Fuel System Treatment Plus, P/N 88861011 (in Canada, P/N 88861012) Active Fuel Injector Tester (AFIT- CH-47976) Some dealers may not have an Active Fuel Injector Tester (AFIT- CH-47976). Dealers can contact to order an AFIT- CH-47976. Dealers still can test the fuel injectors without an AFIT. Refer to Fuel Injector Diagnosis (w/ J 39021 or Tech 2(R)) in SI. Important As mentioned in the AFIT User Guide, vehicles that are not listed in the AFIT menu can still be tested with the AFIT. Depending on the model, it may be possible to enter the previous model year and proceed with testing using the DLC connection. If this is not possible on the model that you are working on, it will be necessary to use the direct connection method outlined in the AFIT User Guide (See Pages 17-31). General Motors recommends that the Active Fuel Injector Tester (AFIT) be used in testing fuel injectors. If the SI diagnostics do not isolate a cause for this concern, use the Active Fuel Injector Tester (AFIT - CH-47976) to perform an "Injector Test" as outlined in the AFIT User Guide. The AFIT "Injector Test" measures the flow characteristics of all fuel injectors, which is more precise when compared with the standard Tech 2(R) fuel injector balance test. As a result, the AFIT is more likely to isolate the cause of a P1174 DTC (for example: if it is being caused by a fuel injector concern). The CH-47976 (Active Fuel Injector Tester - AFIT) can also be used to measure fuel pressure and fuel system leak down. Also, as mentioned in the P1174 SI diagnosis, if the misfire current counters or misfire graph indicate any misfires, it may be an indicator of the cylinder that is causing the concern. Refer to Fuel Injector Diagnosis (w/CH-47976) in SI for additional instructions. Training (U.S.) To access the training video on AFIT, take the following path at the GM Training Website: 1. After logging into the training website, choose the link on the left side of the page titled "web video library." 2. Then choose "technical." 3. Next, within the search box, type in September course number "10206.09D. 4. This will bring up a link with this course. Scroll through to choose "feature topic." 5. At this point, the seminar can be chosen to view or the video related to the AFIT. Additional training is available from the training website. Please see TECHassist 16044.18T2 Active Fuel Injector Tester and also see 16044.14D1 GM Powertrain Performance for more information on GM Upper Engine and Fuel Injector Cleaner. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 03-06-04-030G > Apr > 09 > Fuel System Driveability Issues/MIL/Multiple DTC's > Page 8288 Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE). Training (Canada) To access the training video on AFIT, take the following path at the GMPro LMS Training Website: 1. After logging into the website, choose the link on the left side of the page titled "Catalog." 2. Then choose "Catalog Search." 3. Next, within the search box, Select Course Number - Contains - "T" then select search. 4. This will bring up a list of TECHassist courses. Scroll through to choose "Active Fuel Injector Tester" and select "View." 5. At this point, a new window will open and the program can be Launched. Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE). Techlink Additional information can be found on AFIT (June 2006 Edition) and GM Upper Engine and Fuel Injector Cleaner (November 2006 Edition) in Techlink. To access the articles, take the following path: 1. Go to GM DealerWorld (U.S.) or the GM GlobalConnect (Canada). 2. Click on the Service Tab in DealerWorld (in Canada, click Technican Resources in the Service Library of GM GlobalConnect). 3. Click on the GM Techlink Hyperlink. 4. Click on the Archives Hyperlink at GM Techlink. - Click on 06-2006 in the Archives Section and Click on the Active Fuel Injector Tester Link in the June 2006 Techlink Article. - Click on 11-2006 in the Archives Section and Click on the GM Top Engine Cleaner Replaced Link in the November 2006 Techlink Article. Injector Cleaning Procedure Notice GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent recommended. DO NOT USE OTHER CLEANING AGENTS AS THEY MAY CONTAIN METHANOL, WHICH CAN DAMAGE FUEL SYSTEM COMPONENTS. Under NO circumstances should the GM Upper Engine and Fuel Injector Cleaner be added to the vehicle fuel tank. Do not exceed the recommended cleaning solution concentration. Testing has demonstrated that exceeding the recommended cleaning solution concentration does not improve the effectiveness of this procedure. Important Vehicles with less than 160 km (100 mi) on the odometer should not have the injectors cleaned. These vehicles should have any out of specification injectors replaced. 1. For 4, 5 and 6 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A - Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) mixed with 420 ml (14 oz) of regular unleaded gasoline. 2. For 8 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline. This procedure will need to be repeated for a second time for an 8 cylinder engine (8 cylinder engines receive 960 ml total fluid 120 ml (4 oz) of Upper Engine and Fuel Injector Cleaner and 840 ml (28 oz) of gasoline. 3. Be sure to follow all additional instructions provided with the tool. 4. Electrically disable the vehicle fuel pump by either removing the fuel pump fuse or the fuel pump relay and disconnecting the oil pressure switch connector, if equipped. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 03-06-04-030G > Apr > 09 > Fuel System Driveability Issues/MIL/Multiple DTC's > Page 8289 5. Turn the ignition to the OFF position. 6. Relieve fuel pressure and disconnect the fuel feed and return lines at the fuel rail. Plug the fuel feed and return lines coming off the fuel rail with J 37287, J 42873 or J 42964 as appropriate for the fuel system. 7. Connect the J 35800-A to the vehicle fuel rail. 8. Pressurize the J 35800-A to 510 kPa (75 psi). 9. Start and idle the engine until it stalls, due to lack of fuel. This should take approximately 15-20 minutes. 10. Turn the ignition to the OFF position. 11. Disconnect the J 35800-A from the fuel rail. 12. Reconnect the vehicle fuel pump relay and oil pressure switch connector, if equipped. 13. Remove the J 37287, J 42873 or J 42964 and reconnect the vehicle fuel feed and return lines. 14. Start and idle the vehicle for an additional two minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines. 15. Pour the entire contents of GM Fuel System Treatment Plus (P/N 88861011 [in Canada, P/N 88861012]) into the tank and advise the customer to fill the tank. 16. Review the benefits of using Top Tier Detergent gasoline with the customer and recommend that they add a bottle of GM Fuel System Treatment Plus to the fuel tank at every oil change. Regular use of GM Fuel System Treatment Plus should keep the customer from having to repeat the injector cleaning procedure. 17. Road test the vehicle to verify that the customer concern has been corrected. Parts Information * Only 1/8 of the cost may be claimed for 4 and 6 cylinder engines and 1/4 of the cost for 8 cylinder engines. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table above. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 03-06-04-030G > Apr > 09 > Fuel System Driveability Issues/MIL/Multiple DTC's > Page 8290 For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 04-06-04-051B > Jan > 06 > Fuel System Fuel Injector Maintenance Cleaning Fuel Injector: All Technical Service Bulletins Fuel System - Fuel Injector Maintenance Cleaning Bulletin No.: 04-06-04-051B Date: January 04, 2006 INFORMATION Subject: Maintenance Cleaning of Fuel Injectors Models: 2006 and Prior All General Motors Passenger Cars and Trucks 2003-2006 HUMMER H2 2006 HUMMER H3 Supercede: This bulletin is being revised to add models and model years and update the name and part number of GM Fuel System Treatment. Please discard Corporate Bulletin Number 04-06-04-051A (Section 06 - Engine/Propulsion System). General Motors is aware that some companies are marketing tools, equipment and programs to support fuel injector cleaning as a preventative maintenance procedure. General Motors does not endorse, support or acknowledge the need for fuel injector cleaning as a preventative maintenance procedure. Fuel injector cleaning is approved only when performed as directed by a published GM driveability or DTC diagnostic service procedure. Due to variation in fuel quality in different areas of the country, the only preventative maintenance currently endorsed by GM regarding its gasoline engine fuel systems is the addition of GM Fuel System Treatment PLUS, P/N 88861011 (for U.S. ACDelco(R), use P/N 88861013) (in Canada, P/N 88861012), added to a tank of fuel at each oil change. Refer to Corporate Bulletin Number 03-06-04-030A for proper cleaning instructions. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair Grounding Point: All Technical Service Bulletins Electrical - Information For Electrical Ground Repair INFORMATION Bulletin No.: 10-08-45-001B Date: October 25, 2010 Subject: Information for Electrical Ground Repair - Use New Replacement Fasteners with Conductive Finish Models: 2011 and Prior GM Passenger Cars and Trucks (including Saturn) 2010 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X Supercede: This bulletin is being revised to add the 2011 model year and update the Warranty Information. Please discard Corporate Bulletin Number 10-08-45-001A (Section 08 - Body and Accessories). Electrical Ground Repair Overview Proper electrical system function relies on secure, stable and corrosion-free electrical ground connections. Loose, stripped, or corroded connections increase the possibility of improper system function and loss of module communication. These conditions may also lead to unnecessary repairs and component replacement. In general, electrical ground connections are accomplished using one, or a combination of the following attachment methods: - Welded M6 stud and nut - Welded M6 nut and bolt - Welded M8 nut and bolt Determine which attachment method is used and perform the appropriate or alternative repair as described in this bulletin. M6 Weld Stud Replacement Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. Select a location adjacent the damaged or missing M6 ground stud having 20 mm (0.79 in) clearance behind the panel surface and 20 mm (0.79 in) clearance surrounding the M6 conductive rivet stud flange. 2. Using GM approved residue-free solvent or equivalent, remove any grease from the repair site and allow to dry. Note Ensure 20 mm (0.79 in) clearance is maintained behind the panel to be drilled. 3. Drill a 10 mm (0.40 in) diameter hole through the panel. 4. Remove paint and primer from the area surrounding the 10 mm (0.40 in) hole until bare metal is visible. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8300 Important The M6 conductive rivet stud as shown, can accommodate a panel thickness range of 0.7-4.2 mm (0.03-0.17 in). If there are layers of sheet metal, they should be touching without any air gaps to ensure a good ground. 5. Select a M6 conductive rivet stud. Refer to the Parts Information section of this bulletin. Note Use the GE-50317 rivet stud tool kit. 6. Place the M6 conductive rivet stud (1) in the 10 mm (0.40 in) hole. Assemble the rivet stud tool (2) with the groove and flare side facing the rivet stud, then the washer and the M6 nut (3). 7. Using a wrench on the rivet stud tool, and a socket on the M6 nut, secure the M6 conductive rivet stud. 8. Ensure the rivet stud is securely fastened, WITHOUT ANY detectable movement. 9. Completely wrap the threads of the rivet stud with painters tape or equivalent. Note The rivet stud and surrounding panel area MUST BE properly refinished PRIOR to the installation of the ground wire terminal and conductive nut to maintain a secure, stable and corrosion-free electrical ground. 10. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 11. Allow the refinished repair area to cure sufficiently before removing the protective material applied to the rivet stud threads. 12. Remove the painters tape or equivalent from the rivet stud threads. 13. Using GM approved residue-free solvent or equivalent, thoroughly clean the rivet stud threads to remove any adhesive and allow to dry. 14. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M6 conductive rivet stud. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8301 15. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 16. Install the electrical ground wire terminal to the rivet stud. 17. Select a M6 conductive nut. Refer to the Parts Information section of this bulletin. 18. Install the M6 conductive nut to the rivet stud and: Tighten Tighten to 8 Nm (71 lb in). 19. Verify proper system operation. M6 Weld Nut Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the M6 weld nut at the electrical ground location is damaged or stripped, a M7 conductive self-threading bolt may be used to secure the ground wire terminal. 2. Using GM approved residue-free solvent or equivalent, remove any grease from the surface surrounding the weld nut and allow to dry. 3. Remove any loose metal particles from the damaged or stripped weld nut with a stiff brush. 4. Select a M7 conductive self-threading bolt. Refer to the Parts Information section of this bulletin 5. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M7 conductive self-threading bolt. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 6. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 7. Install the electrical ground wire terminal to the M7 conductive self-threading bolt. 8. Install the M7 conductive self-threading bolt and: Tighten Tighten to 9 Nm (80 lb in). 9. Verify proper system operation. M6 Weld Nut Alternative Repair Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the electrical ground location is accessible from both sides of the panel, a M6 conductive bolt and a M6 conductive nut may be used to secure the electrical ground wire terminal. Refer to the Parts Information section of this bulletin. 2. Select a location adjacent the damaged M6 weld nut having 20 mm (0.79 in) clearance behind the panel surface and 20 mm (0.79 in) clearance surrounding the new electrical ground site. 3. Using GM approved residue-free solvent or equivalent, remove any grease from the surface surrounding the ground location and allow to dry. Note Ensure 20 mm (0.79 in) clearance is maintained behind the panel to be drilled. 4. Drill a 8.5 mm (0.33 in) diameter hole through the panel. 5. Remove paint and primer from the area surrounding the 8.5 mm (0.33 in) hole until bare metal is visible. 6. Select a M6 conductive bolt. Refer to the Parts Information section of this bulletin. 7. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M6 conductive bolt. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 8. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 9. Install the electrical ground wire terminal and the M6 conductive bolt to the ground location. 10. Select a M6 conductive nut. Refer to the Parts Information section of this bulletin. 11. Install the M6 conductive nut to the bolt and: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8302 Tighten Tighten to 8 Nm (71 lb in). Note The repair area MUST BE properly refinished to maintain a secure, stable and corrosion-free electrical ground. 12. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 13. Verify proper system operation. M8 Weld Nut Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the M8 weld nut electrical ground location is accessible from both sides of the panel, a M8 conductive bolt and a M8 conductive nut may be used to secure the electrical ground wire terminal. Refer to the Parts Information section of this bulletin. 2. Select a location adjacent the M8 weld nut having 20 mm (0.79 in) clearance behind the panel surface and 20 mm (0.79 in) clearance surrounding the new electrical ground site. 3. Using GM approved residue-free solvent or equivalent, remove any grease from the surface surrounding the ground location and allow to dry. Note Ensure 20 mm (0.79 in) clearance is maintained behind the panel to be drilled. 4. Drill a 10 mm (0.40 in) diameter hole through the panel. 5. Remove paint and primer from the area surrounding the 10 mm (0.40 in) hole until bare metal is visible. 6. Select a M8 conductive bolt. Refer to the Parts Information section of this bulletin. 7. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M8 conductive bolt. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 8. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 9. Install the electrical ground wire terminal and the M8 conductive bolt to the ground location. 10. Select a M8 conductive nut. Refer to the Parts Information section of this bulletin. 11. Install the M8 conductive nut to the bolt and: Tighten Tighten to 22 Nm (16 lb ft). Note The repair area MUST BE properly refinished to maintain a secure, stable and corrosion-free electrical ground. 12. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 13. Verify proper system operation. M8 Weld Nut Alternative Repair Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the M8 weld nut electrical ground location is not accessible from both sides of the panel, a M6 conductive rivet stud and a M6 conductive nut may be used to secure the electrical ground wire terminal. 2. Select a location adjacent the damaged M8 weld nut having 20 mm (0.79 in) clearance behind the panel surface and 20 mm (0.79 in) clearance surrounding the M6 conductive rivet stud flange. 3. Using GM approved residue-free solvent or equivalent, remove any grease from the repair site and allow to dry. Note Ensure 20 mm (0.79 in) clearance is maintained behind the panel to be drilled. 4. Drill a 10 mm (0.40 in) diameter hole through the panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8303 5. Remove paint and primer from the area surrounding the 10 mm (0.40 in) until bare metal is visible. Important The M6 conductive rivet stud as shown, can accommodate a panel thickness range of 0.7-4.2 mm (0.03-0.17 in). If there are layers of sheet metal, they should be touching without any air gaps to ensure a good ground. 6. Select a M6 conductive rivet stud. Refer to the Parts Information section of this bulletin. Note Use the GE-50317 rivet stud tool kit. 7. Place the M6 conductive rivet stud (1) in the 10 mm (0.40 in) hole. Assemble the rivet stud tool (2) with the groove and flare side facing the rivet stud, then the washer and the M6 nut (3). 8. Using a wrench on the rivet stud tool, and a socket on the M6 nut, secure the M6 conductive rivet stud. 9. Ensure the new rivet stud is securely fastened, WITHOUT ANY detectable movement. 10. Completely wrap the threads of the rivet stud with painters tape or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8304 Note The rivet stud and surrounding panel area MUST BE properly refinished PRIOR to the installation of the electrical ground wire terminal and conductive nut to maintain a secure, stable and corrosion-free electrical ground. 11. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 12. Allow the refinished repair area to cure sufficiently before removing the protective material applied to the rivet stud threads. 13. Remove the painters tape or equivalent from the rivet stud threads. 14. Using GM approved residue-free solvent or equivalent, thoroughly clean the rivet stud threads to remove any adhesive and allow to dry. 15. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M6 conductive rivet stud. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 16. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 17. Install the electrical ground wire terminal to the M6 conductive rivet stud. 18. Select a M6 conductive nut. Refer to the Parts Information section of this bulletin. 19. Install the M6 conductive nut to the rivet stud and: Tighten Tighten to 8 Nm (71 lb in) 20. Verify proper system operation. Parts Information Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use: Warranty Information (Saab Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8305 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set Grounding Point: All Technical Service Bulletins Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set TECHNICAL Bulletin No.: 04-05-25-002E Date: March 11, 2009 Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) Models Supercede: This bulletin is being revised to add step 2 to the procedure and update the Parts and Warranty Information. Please discard Corporate Bulletin Number 04-05-25-002D (Section 05 - Brakes). Condition Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module. Cause A poor connection at the EBCM ground is causing unnecessary replacement of brake modules. Important: The EBCM ground is different for each application. Refer to the list below for the proper ground reference: ^ Midsize Utilities = Ground 304 ^ SSR = Ground 400 ^ Fullsize Trucks and Utilities = Ground 110 Correction Important: Do not replace the brake module to correct this condition. Perform the following repair before further diagnosis of the EBCM. Perform the following steps to improve the connection of the EBCM Ground: 1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire. 2. If the original fastener has a welded on nut, remove the nut from the frame, and if required, enlarge the bolt hole to accommodate the new bolt and nut. 3. Clean the area, front and back, using a tool such as a *3M(TM) Scotch-Brite Roloc disc or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set > Page 8310 4. Install the ground, then the washer and then the bolt to the frame. Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish. 5. Install a washer and nut to the back side of the frame. Tighten Tighten the nut to 9 Nm (79 lb in). 6. Cover the front and back side of the repair area using Rubberized Undercoating. An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8316 Important The M6 conductive rivet stud as shown, can accommodate a panel thickness range of 0.7-4.2 mm (0.03-0.17 in). If there are layers of sheet metal, they should be touching without any air gaps to ensure a good ground. 5. Select a M6 conductive rivet stud. Refer to the Parts Information section of this bulletin. Note Use the GE-50317 rivet stud tool kit. 6. Place the M6 conductive rivet stud (1) in the 10 mm (0.40 in) hole. Assemble the rivet stud tool (2) with the groove and flare side facing the rivet stud, then the washer and the M6 nut (3). 7. Using a wrench on the rivet stud tool, and a socket on the M6 nut, secure the M6 conductive rivet stud. 8. Ensure the rivet stud is securely fastened, WITHOUT ANY detectable movement. 9. Completely wrap the threads of the rivet stud with painters tape or equivalent. Note The rivet stud and surrounding panel area MUST BE properly refinished PRIOR to the installation of the ground wire terminal and conductive nut to maintain a secure, stable and corrosion-free electrical ground. 10. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 11. Allow the refinished repair area to cure sufficiently before removing the protective material applied to the rivet stud threads. 12. Remove the painters tape or equivalent from the rivet stud threads. 13. Using GM approved residue-free solvent or equivalent, thoroughly clean the rivet stud threads to remove any adhesive and allow to dry. 14. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M6 conductive rivet stud. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8317 15. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 16. Install the electrical ground wire terminal to the rivet stud. 17. Select a M6 conductive nut. Refer to the Parts Information section of this bulletin. 18. Install the M6 conductive nut to the rivet stud and: Tighten Tighten to 8 Nm (71 lb in). 19. Verify proper system operation. M6 Weld Nut Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the M6 weld nut at the electrical ground location is damaged or stripped, a M7 conductive self-threading bolt may be used to secure the ground wire terminal. 2. Using GM approved residue-free solvent or equivalent, remove any grease from the surface surrounding the weld nut and allow to dry. 3. Remove any loose metal particles from the damaged or stripped weld nut with a stiff brush. 4. Select a M7 conductive self-threading bolt. Refer to the Parts Information section of this bulletin 5. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M7 conductive self-threading bolt. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 6. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 7. Install the electrical ground wire terminal to the M7 conductive self-threading bolt. 8. Install the M7 conductive self-threading bolt and: Tighten Tighten to 9 Nm (80 lb in). 9. Verify proper system operation. M6 Weld Nut Alternative Repair Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the electrical ground location is accessible from both sides of the panel, a M6 conductive bolt and a M6 conductive nut may be used to secure the electrical ground wire terminal. Refer to the Parts Information section of this bulletin. 2. Select a location adjacent the damaged M6 weld nut having 20 mm (0.79 in) clearance behind the panel surface and 20 mm (0.79 in) clearance surrounding the new electrical ground site. 3. Using GM approved residue-free solvent or equivalent, remove any grease from the surface surrounding the ground location and allow to dry. Note Ensure 20 mm (0.79 in) clearance is maintained behind the panel to be drilled. 4. Drill a 8.5 mm (0.33 in) diameter hole through the panel. 5. Remove paint and primer from the area surrounding the 8.5 mm (0.33 in) hole until bare metal is visible. 6. Select a M6 conductive bolt. Refer to the Parts Information section of this bulletin. 7. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M6 conductive bolt. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 8. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 9. Install the electrical ground wire terminal and the M6 conductive bolt to the ground location. 10. Select a M6 conductive nut. Refer to the Parts Information section of this bulletin. 11. Install the M6 conductive nut to the bolt and: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8318 Tighten Tighten to 8 Nm (71 lb in). Note The repair area MUST BE properly refinished to maintain a secure, stable and corrosion-free electrical ground. 12. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 13. Verify proper system operation. M8 Weld Nut Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the M8 weld nut electrical ground location is accessible from both sides of the panel, a M8 conductive bolt and a M8 conductive nut may be used to secure the electrical ground wire terminal. Refer to the Parts Information section of this bulletin. 2. Select a location adjacent the M8 weld nut having 20 mm (0.79 in) clearance behind the panel surface and 20 mm (0.79 in) clearance surrounding the new electrical ground site. 3. Using GM approved residue-free solvent or equivalent, remove any grease from the surface surrounding the ground location and allow to dry. Note Ensure 20 mm (0.79 in) clearance is maintained behind the panel to be drilled. 4. Drill a 10 mm (0.40 in) diameter hole through the panel. 5. Remove paint and primer from the area surrounding the 10 mm (0.40 in) hole until bare metal is visible. 6. Select a M8 conductive bolt. Refer to the Parts Information section of this bulletin. 7. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M8 conductive bolt. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 8. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 9. Install the electrical ground wire terminal and the M8 conductive bolt to the ground location. 10. Select a M8 conductive nut. Refer to the Parts Information section of this bulletin. 11. Install the M8 conductive nut to the bolt and: Tighten Tighten to 22 Nm (16 lb ft). Note The repair area MUST BE properly refinished to maintain a secure, stable and corrosion-free electrical ground. 12. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 13. Verify proper system operation. M8 Weld Nut Alternative Repair Caution Use only the GM-approved replacement fasteners with conductive finish for electrical ground repair. 1. If the M8 weld nut electrical ground location is not accessible from both sides of the panel, a M6 conductive rivet stud and a M6 conductive nut may be used to secure the electrical ground wire terminal. 2. Select a location adjacent the damaged M8 weld nut having 20 mm (0.79 in) clearance behind the panel surface and 20 mm (0.79 in) clearance surrounding the M6 conductive rivet stud flange. 3. Using GM approved residue-free solvent or equivalent, remove any grease from the repair site and allow to dry. Note Ensure 20 mm (0.79 in) clearance is maintained behind the panel to be drilled. 4. Drill a 10 mm (0.40 in) diameter hole through the panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8319 5. Remove paint and primer from the area surrounding the 10 mm (0.40 in) until bare metal is visible. Important The M6 conductive rivet stud as shown, can accommodate a panel thickness range of 0.7-4.2 mm (0.03-0.17 in). If there are layers of sheet metal, they should be touching without any air gaps to ensure a good ground. 6. Select a M6 conductive rivet stud. Refer to the Parts Information section of this bulletin. Note Use the GE-50317 rivet stud tool kit. 7. Place the M6 conductive rivet stud (1) in the 10 mm (0.40 in) hole. Assemble the rivet stud tool (2) with the groove and flare side facing the rivet stud, then the washer and the M6 nut (3). 8. Using a wrench on the rivet stud tool, and a socket on the M6 nut, secure the M6 conductive rivet stud. 9. Ensure the new rivet stud is securely fastened, WITHOUT ANY detectable movement. 10. Completely wrap the threads of the rivet stud with painters tape or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8320 Note The rivet stud and surrounding panel area MUST BE properly refinished PRIOR to the installation of the electrical ground wire terminal and conductive nut to maintain a secure, stable and corrosion-free electrical ground. 11. Refinish the repair area using an anti-corrosion primer. Refer to Anti-Corrosion Treatment and Repair in SI. 12. Allow the refinished repair area to cure sufficiently before removing the protective material applied to the rivet stud threads. 13. Remove the painters tape or equivalent from the rivet stud threads. 14. Using GM approved residue-free solvent or equivalent, thoroughly clean the rivet stud threads to remove any adhesive and allow to dry. 15. Using a small brush, apply Dielectric Lubricant GM P/N 12377900 (Canadian P/N 10953529) to the threads of the M6 conductive rivet stud. Note Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can accumulate at the electrical contact points causing the electrical resistance across the connection to increase. 16. Carefully remove ANY corrosion or contamination that may be present on the electrical ground wire terminal. 17. Install the electrical ground wire terminal to the M6 conductive rivet stud. 18. Select a M6 conductive nut. Refer to the Parts Information section of this bulletin. 19. Install the M6 conductive nut to the rivet stud and: Tighten Tighten to 8 Nm (71 lb in) 20. Verify proper system operation. Parts Information Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use: Warranty Information (Saab Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 10-08-45-001B > Oct > 10 > Electrical - Information For Electrical Ground Repair > Page 8321 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fuel Injector: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set > Page 8326 4. Install the ground, then the washer and then the bolt to the frame. Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish. 5. Install a washer and nut to the back side of the frame. Tighten Tighten the nut to 9 Nm (79 lb in). 6. Cover the front and back side of the repair area using Rubberized Undercoating. An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions Fuel Injector: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8329 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8330 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8331 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8333 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8334 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8335 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8336 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8337 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8338 Fuel Injector: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8339 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8340 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8341 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8342 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8343 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8344 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8345 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8346 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8347 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8348 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8349 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8350 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8351 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8352 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8353 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8354 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8355 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8356 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8357 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8358 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8359 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8360 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8361 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8362 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8363 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8364 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8365 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8366 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8367 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8368 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8369 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8370 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8371 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8372 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8373 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8374 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8375 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8376 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8377 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8378 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8379 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8380 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8381 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8382 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8383 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8384 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8385 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8386 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8387 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8388 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8389 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8390 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8391 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8392 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8393 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8394 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8395 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8396 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8397 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8398 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8399 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8400 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8401 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8402 Fuel Injector: Connector Views Fuel Injector 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8403 Fuel Injector 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8404 Fuel Injector 3 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8405 Fuel Injector 4 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8406 Fuel Injector 5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8407 Fuel Injector 6 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8408 Fuel Injector 7 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Diagram Information and Instructions > Page 8409 Fuel Injector 8 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Diagrams > Page 8410 Fuel Injector: Description and Operation FUEL INJECTORS The fuel injector assembly is a solenoid device controlled by the engine control module (ECM) that meters pressurized fuel to a single engine cylinder. The ECM energizes the injector solenoid to open a normally closed ball valve. This allows the fuel to flow into the top of the injector, past the ball valve, and through a director plate at the injector outlet. The director plate has machined holes that control the fuel flow, generating a spray of finely atomized fuel at the injector tip. Fuel from the injector tip is directed at the intake valve, causing the fuel to become further atomized and vaporized before entering the combustion chamber. This fine atomization improves fuel economy and emissions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Testing and Inspection > Fuel Injector Balance Test With Special Tool Fuel Injector: Testing and Inspection Fuel Injector Balance Test With Special Tool FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL DESCRIPTION Fuel Injector Balance Test Example (Typical) The scan tool is first used to energize the fuel pump. The fuel injector tester is then used to pulse each injector for a precise amount of time, allowing a measured amount of fuel into the manifold. This causes a drop in system fuel pressure that can be recorded and used to compare each injector. TEST Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Testing and Inspection > Fuel Injector Balance Test With Special Tool > Page 8413 Step 1 - Step 4 Step 5 - Step 7 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Testing and Inspection > Fuel Injector Balance Test With Special Tool > Page 8414 Fuel Injector: Testing and Inspection Fuel Injector Balance Test with Tech 2 FUEL INJECTOR BALANCE TEST WITH TECH 2 DESCRIPTION Fuel Injector Balance Test Example (Typical) The scan tool is first used to energize the fuel pump. The scan tool is then used to pulse each injector for a precise amount of time, allowing a measured amount of fuel into the manifold. This causes a drop in system fuel pressure that can be recorded and used to compare the flow through each injector. TEST Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Testing and Inspection > Fuel Injector Balance Test With Special Tool > Page 8415 Step 1 - Step 4 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Testing and Inspection > Fuel Injector Balance Test With Special Tool > Page 8416 Step 5 - Step 7 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Testing and Inspection > Fuel Injector Balance Test With Special Tool > Page 8417 Fuel Injector: Testing and Inspection Fuel Injector Coil Test FUEL INJECTOR COIL TEST CIRCUIT DESCRIPTION The control module enables the appropriate fuel injector on the intake stroke for each cylinder. Ignition voltage is supplied directly to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver. A fuel injector coil winding resistance that is too high or too low will affect engine driveability. A fuel injector control circuit DTC may not set, but a misfire may be apparent. The fuel injector coil windings are affected by temperature. The resistance of the fuel injector coil windings will increase as the temperature of the fuel injector increases. DIAGNOSTIC AIDS - Monitoring the misfire current counters, or misfire graph, may help isolate the fuel injector that is causing the condition. - Operating the vehicle over a wide temperature range may help isolate the fuel injector that is causing the condition. - Perform the fuel injector coil test within the conditions of the customers concern. A fuel injector condition may only be apparent at a certain temperature, or under certain conditions. TEST Step 1 - Step 7 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Service and Repair > Fuel Injector Replacement Fuel Injector: Service and Repair Fuel Injector Replacement FUEL INJECTOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel rail. NOTE: Use care in removing the fuel injectors in order to prevent damage to the fuel injector electrical connector pins or the fuel injector nozzles. Do not immerse the fuel injector in any type of cleaner. The fuel injector is an electrical component and may be damaged by this cleaning method. IMPORTANT: The engine oil may be contaminated with fuel if the fuel injectors are leaking. 2. Remove and discard the fuel injector retainer clip (4). 3. Remove the fuel injector (2). 4. Remove and discard the fuel injector O-ring seals (1 and 3). INSTALLATION PROCEDURE IMPORTANT: When ordering new fuel injectors, you must order the correct injector for the application being serviced. The fuel injector (1) is stamped with a identification part number (2). A 4-digit build date code (3) indicates the month (4), day (5), year (6), and the shift (7) that built the injector. 1. Lubricate the NEW injector O-ring seals (2 and 4) with clean engine oil. 2. Install the NEW injector O-ring seals (2 and 4) onto the injector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Service and Repair > Fuel Injector Replacement > Page 8420 3. Install a NEW retainer clip (1) on the injector (3). 4. Push the fuel injector into the fuel rail injector socket with the electrical connector facing outward. The retainer clip locks on to a flange on the fuel rail injector socket. 5. Install the fuel rail. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Service and Repair > Fuel Injector Replacement > Page 8421 Fuel Injector: Service and Repair Upper Intake Manifold Sight Shield Replacement Upper Intake Manifold Sight Shield Replacement Removal Procedure 1. Loosen intake manifold sight shield wing nut. 2. Gently lift up in order to disengage the sight shield from the ball stud. 3. Remove the sight shield from the sight shield retainer. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Service and Repair > Fuel Injector Replacement > Page 8422 4. Remove the sight shield retainer bolts and the retainer, if required. 5. Remove the sight shield ball stud, if required. Installation Procedure Notice: Refer to Fastener Notice in Service Precautions. 1. Install the sight shield ball stud, if required. ^ Tighten the stud to 5 Nm (44 inch lbs.). 2. Position the sight shield retainer to the intake manifold and install the bolts, if required. ^ Tighten the bolts to 5 Nm (44 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Service and Repair > Fuel Injector Replacement > Page 8423 Notice: Use care when installing the engine sight shield to avoid contacting the manifold absolute pressure (MAP) sensor wire harness connector. Loss of engine performance or engine damage may result. 3. Install the sight shield to the sight shield retainer. 4. Seat the sight shield onto the ball stud and press down over the stud in order to secure the sight shield. 5. Tighten intake manifold sight shield wing nut until snug. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Line Coupler > Component Information > Description and Operation Fuel Line Coupler: Description and Operation QUICK-CONNECT FITTINGS Quick-connect fittings provide a simplified means of installing and connecting fuel system components. The fittings consist of a unique female connector and a compatible male pipe end. O-rings located inside the female connector provide the fuel seal. Integral locking tabs inside the female connector hold the fittings together. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Line Coupler > Component Information > Service and Repair > Quick Connect Fitting(s) Service (Metal Collar) Fuel Line Coupler: Service and Repair Quick Connect Fitting(s) Service (Metal Collar) QUICK CONNECT FITTING(S) SERVICE (METAL COLLAR) TOOLS REQUIRED J 41769 Fuel Line Quick Disconnect Tool REMOVAL PROCEDURE 1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure. 2. Remove the retainers from the fuel line quick-connect fittings. 3. Using compressed air, blow any dirt or debris from around the fittings. CAUTION: Refer to Safety Glasses and Compressed Air Caution in Service Precautions. 4. Using the correct tool from J 41769, insert the tool into the female connector, then push inward in order to release the quick connect locking tabs. 5. Pull the fuel line connection apart. 6. Use a clean shop towel in order to wipe off the male connection end. NOTE: If necessary, remove rust or burrs from the fuel pipes with an emery cloth. Use a radial motion with the fuel pipe end in order to prevent Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Line Coupler > Component Information > Service and Repair > Quick Connect Fitting(s) Service (Metal Collar) > Page 8429 damage to the O-ring sealing surface. Use a clean shop towel in order to wipe off the male tube ends. Inspect all the connections for dirt and burrs. Clean or replace the components and assemblies as required. 7. Inspect both ends of the fittings for dirt and burrs. Clean or replace the components as required. INSTALLATION PROCEDURE CAUTION: In order to reduce the risk of fire and personal injury, before connecting fuel pipe fittings, always apply a few drops of clean engine oil to the male pipe ends. This will ensure proper reconnection and prevent a possible fuel leak. During normal operation, the O-rings located in the female connector will swell and may prevent proper reconnection if not lubricated. 1. Apply a few drops of clean engine oil to the male connection end. 2. Push both sides of the fittings together in order to snap the retaining tabs into place. 3. Once installed, pull on both sides of the connection in order to make sure the connection is secure. 4. Install the retainers to the fuel line quick-connect fittings. 5. Install the fuel cap. 6. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Line Coupler > Component Information > Service and Repair > Quick Connect Fitting(s) Service (Metal Collar) > Page 8430 Fuel Line Coupler: Service and Repair Quick Connect Fitting(s) Service (Plastic Collar) QUICK CONNECT FITTING(S) SERVICE (PLASTIC COLLAR) REMOVAL PROCEDURE CAUTION: Refer to Gasoline/Gasoline Vapors Caution in Service Precautions. IMPORTANT: There are several types of Plastic Collar Fuel and Evaporative Emission Quick Connect Fittings used on this vehicle. Bartholomew (1) - Q Release (2) - Squeeze to Release (3) - Sliding Retainer (4) - Push Down TI (5) The following instructions apply to all of these types of Plastic Collar Quick Connect Fittings except where indicated. 1. Relieve the fuel system pressure before servicing any fuel system connection. Refer to the Fuel Pressure Relief Procedure. 2. Using compressed air, blow any dirt out of the quick-connect fitting. CAUTION: Refer to Fuel and Evaporative Emission (EVAP) Hose/Pipe Connection Cleaning Notice in Service Precautions. - Refer to Safety Glasses Caution in Service Precautions. 3. This step applies to Bartholomew style connectors ONLY. Squeeze the plastic quick connect fitting release tabs. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Line Coupler > Component Information > Service and Repair > Quick Connect Fitting(s) Service (Metal Collar) > Page 8431 4. This step applies to Release Tab style connectors ONLY. Release the fitting by Pushing the tab toward the other side of the slot in the fitting. 5. This step applies to Squeeze to Release style connectors ONLY. Squeeze where indicated by arrows on both sides of the plastic ring surrounding the quick connect fitting. 6. This step applies to Sliding Retainer style connectors ONLY. Release the fitting by pressing on one side of the release tab causing it to push in slightly. If the tab doesn't move try pressing the tab in from the opposite side. The tab will only move in one direction Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Line Coupler > Component Information > Service and Repair > Quick Connect Fitting(s) Service (Metal Collar) > Page 8432 7. This step applies to the Push Down TI style connectors ONLY. Release the fitting by pressing on the tab indicated by arrow. 8. Pull the connection apart. CAUTION: Refer to Relieving Fuel Pressure Caution in Service Precautions. INSTALLATION PROCEDURE 1. Apply a few drops of clean engine oil to the male connection end. CAUTION: Refer to Fuel Pipe Fitting Caution in Service Precautions. 2. Push both sides of the quick-connect fitting together in order to cause the retaining feature to snap into place. 3. Once installed, pull on both sides of the quick-connect fitting in order to make sure the connection is secure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure Regulator > Component Information > Description and Operation Fuel Pressure Regulator: Description and Operation FUEL PRESSURE REGULATOR The fuel pressure regulator is contained in the fuel sender assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pressure > System Information > Specifications Fuel Pressure: Specifications Fuel Pressure (Key ON, Engine OFF).................................................................................................. ..............................................385-425 kPa (55-62 psi) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal Fuel Pressure: Testing and Inspection Fuel Pressure Gage Installation and Removal FUEL PRESSURE GAGE INSTALLATION AND REMOVAL TOOLS REQUIRED J 34730-1A Fuel Pressure Gage INSTALLATION PROCEDURE CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. 1. Remove the air cleaner resonator outlet duct. 2. Remove the fuel pressure service connection cap, located on the fuel rail. 3. Install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located on the fuel rail. CAUTION: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. 4. Turn ON the ignition. 5. Place the bleed hose of the fuel pressure gage into an approved gasoline container. CAUTION: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion. 6. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage. 7. Command the fuel pump ON with a scan tool. 8. Close the bleed valve on the fuel pressure gage. 9. Inspect for fuel leaks. REMOVAL PROCEDURE 1. Remove the bleed hose on the J 34730-1A from the approved container. 2. Remove the shop towel from around the fuel pressure service connection and discard into an approved container. 3. Disconnect the J 34730-1A from the fuel pressure service connection. 4. Install the fuel pressure service connection cap. 5. Inspect for leaks using the following procedure: 1. Turn ON the ignition, with the engine OFF for 2 seconds. 2. Turn OFF the ignition for 10 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Inspect for fuel leaks. 6. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 8442 Fuel Pressure: Testing and Inspection Fuel System Diagnosis FUEL SYSTEM DIAGNOSIS SYSTEM DESCRIPTION The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON. The fuel system is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions. The fuel tank stores the fuel supply. An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times. TEST Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 8443 Step 1 - Step 5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pressure > System Information > System Diagnosis > Fuel Pressure Gage Installation and Removal > Page 8444 Step 6 - Step 13 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Locations Fuel Pump Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Locations > Page 8448 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Locations > Page 8449 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Locations > Page 8450 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions Fuel Pump Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8453 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8454 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8455 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8456 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8457 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8458 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8459 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8460 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8461 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8462 Fuel Pump Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8463 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8464 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8465 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8466 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8467 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8468 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8469 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8470 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8471 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8472 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8473 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8474 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8475 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8476 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8477 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8478 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8479 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8480 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8481 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8482 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8483 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8484 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8485 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8486 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8487 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8488 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8489 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8490 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8491 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8492 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8493 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8494 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8495 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8496 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8497 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8498 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8499 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8500 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8501 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8502 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8503 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8504 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8505 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8506 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8507 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8508 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8509 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8510 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8511 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8512 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8513 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8514 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8515 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8516 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8517 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8518 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8519 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8520 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8521 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8522 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8523 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8524 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8525 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump Pickup Filter > Component Information > Description and Operation Fuel Pump Pickup Filter: Description and Operation FUEL STRAINER The fuel strainer attaches to the lower end of the fuel sender. The fuel strainer is made of woven plastic. The functions of the fuel strainer are to filter contaminants and to wick fuel. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation Fuel Rail: Description and Operation FUEL RAIL ASSEMBLY The fuel rail assembly attaches to the engine intake manifold. The fuel rail assembly performs the following functions: - Positions the injectors (3) in the intake manifold - Distributes fuel evenly to the injectors (2) - Fuel Rail Feed Pipe (1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8532 Fuel Rail: Service and Repair FUEL RAIL ASSEMBLY REPLACEMENT REMOVAL PROCEDURE IMPORTANT: An eight-digit identification number is located on the fuel rail. Refer to this model identification number if servicing or part replacement is required. 1. Remove the air cleaner outlet duct. 2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure. 3. Remove the positive crankcase ventilation (PCV) foul air hose. 4. Disconnect the air conditioning (A/C) compressor pressure switch electrical connector (2). 5. Remove the wire harness from the clip (1) on the cylinder head. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8533 6. Disconnect the mass air flow (MAF)/intake air temperature (IAT) sensor electrical connector (1). 7. Disconnect the generator electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8534 8. Disconnect the following electrical connectors on the right hand side of the engine: - Coil main electrical harness (1) - Electronic throttle control (ETC) (2) - Fuel injectors (3) 9. Perform the following steps in order to disconnect the fuel injector electrical connectors. 1. Mark the connectors to their corresponding injectors to ensure correct reassembly. 2. Pull the connector position assurance (CPA) retainer (2) on the connector up 1 click. 3. Push the tab (1) on the connector in. 4. Disconnect the fuel injector electrical connector. 5. Repeat the steps for each injector electrical connector. 10. Remove the electrical harness from the clips on ignition coil bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8535 11. Disconnect the following electrical connectors on the left hand side of the engine: - The evaporative emission (EVAP) purge solenoid (1) - The knock sensor (2) - The manifold absolute pressure (MAP) sensor (3) - The main coil (5) - The fuel injectors (4) 12. Remove the electrical harness from the clips on ignition coil bracket. 13. Remove the upper engine wire harness retainer nut (1). 14. Reposition the upper engine wire harness aside. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8536 15. Disconnect the fuel feed pipe (1) from the fuel rail. 16. Remove the EVAP canister purge solenoid from the fuel rail. 17. Remove the fuel rail bolts (2 and 3). 18. Loosen but do not remove the fuel rail crossover pipe retainer clip screws. 19. Remove the fuel rail assembly (1). NOTE: Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components. - Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages. IMPORTANT: Before removal, clean the fuel rail with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent. 20. Remove the fuel injector lower O-ring seal (4) from each injector, if necessary. 21. Discard the O-ring seals. 22. If the fuel rail is not being replaced, go to the Installation Procedure. DISASSEMBLY PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8537 1. Remove the fuel injectors (2) from the fuel rail (5). 2. Remove the fuel rail crossover pipe retaining clip screws (8) and retainer clips (9). 3. Remove the fuel rail crossover pipe (10) from the left and right hand fuel rails. 4. Remove and discard the fuel rail crossover pipe O-rings (11). 5. Remove the service port cap (7) and valve (6) from the fuel rail (5). ASSEMBLY PROCEDURE 1. Install the service port cap (7) and valve (6) to the fuel rail (5). 2. Lubricate the NEW fuel rail crossover pipe O-rings (11) with clean engine oil. 3. Install the NEW fuel rail crossover pipe O-rings (11) onto the crossover pipe (10). 4. Install the fuel rail crossover pipe (10) to the left and right hand fuel rails. 5. Install the fuel rail crossover fuel pipe retainer clips (9). 6. Install the fuel rail retainer clip screws (8) but do not tighten at this time. IMPORTANT: When installing the retaining clip screws for the fuel rail crossover pipe, always start the screws by hand. This will prevent stripping of the threads on the fuel rail. 7. Install the fuel injectors (2) to the fuel rail (5). INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8538 CAUTION: The fuel rail stop bracket must be installed onto the engine assembly. The stop bracket serves as a protective shield for the fuel rail in the event of a vehicle frontal crash. If the fuel rail stop bracket is not installed and the vehicle is involved in a frontal crash, fuel could be sprayed possibly causing a fire and personal injury from burns. 1. Lubricate the NEW lower injector O-ring seals with clean engine oil. 2. Install the NEW O-ring seals onto each injector. 3. Install the fuel rail (1). 4. Apply a 5 mm (0.2 in) band of threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the fuel rail bolts (2 and 3). 5. Install the fuel rail bolts (2 and 3). NOTE: Refer to Fastener Notice. Tighten the bolts to 10 N.m (89 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8539 6. Tighten the fuel rail retainer clip screws. Tighten the screws to 3.8 N.m (34 lb in). 7. Connect the fuel feed pipe (1) to the fuel rail. 8. Position the upper engine wire harness over the engine. 9. Install the upper engine wire harness retainer nut (1). Tighten the nut to 5 N.m (44 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8540 10. Connect the following electrical connectors on the left hand side of the engine: - The EVAP purge solenoid (1) - The knock sensor (2) - The MAP sensor (3) - The main coil (5) - The fuel injectors (4) 11. Perform the following steps in order to connect the fuel injector electrical connectors. 1. Install the connectors to their corresponding injectors to ensure correct reassembly. 2. Connect the fuel injector electrical connector. 3. Push the CPA retainer (2) on the connector in 1 click. 4. Repeat the steps for each injector electrical connector. 12. Install the electrical harness to the clips on ignition coil bracket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8541 13. Connect the following electrical connectors on the right hand side of the engine: - The coil main electrical harness (1) - The ETC (2) - The fuel injectors (3) 14. Install the electrical harness to the clips on ignition coil bracket. 15. Connect the generator electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8542 16. Connect the MAF/IAT sensor electrical connector (1). 17. Install the wire harness to the clip (1) on the cylinder head. 18. Connect the A/C compressor pressure switch electrical connector (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Rail > Component Information > Description and Operation > Page 8543 19. Install the PCV foul air hose. 20. Install the air cleaner outlet duct. 21. Install the fuel fill cap. 22. Connect the negative battery cable. 23. Use the following procedure in order to inspect for leaks: 0. Turn the ignition ON, with the engine OFF, for 2 seconds. 1. Turn the ignition OFF for 10 seconds. 2. Turn the ignition ON, with the engine OFF. 3. Inspect for fuel leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation Fuel Return Line: Description and Operation NYLON FUEL PIPES CAUTION: Refer to Fuel and EVAP Pipe Caution in Service Precautions. Nylon pipes are constructed to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. There are 3 sizes of nylon pipes used: - 9.5 mm (3/8 in) ID for the fuel supply - 7.6 mm (5/16 in) ID for the fuel return - 12.7 mm (1/2 in) ID for the vent Heat resistant rubber hose or corrugated plastic conduit protects the sections of the pipes that are exposed to chafing, to high temperatures, or to vibration. Nylon fuel pipes are somewhat flexible and can be formed around gradual turns under the vehicle. However, if nylon fuel pipes are forced into sharp bends, the pipes kink and restrict the fuel flow. Also, once exposed to fuel, nylon pipes may become stiffer and are more likely to kink if bent too far. Take special care when working on a vehicle with nylon fuel pipes. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation > Page 8547 Fuel Return Line: Service and Repair FUEL HOSE/PIPES REPLACEMENT - CHASSIS REMOVAL PROCEDURE 1. Disconnect the negative battery cable. 2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure. IMPORTANT: Clean the fuel/evaporative emissions (EVAP) pipe connections and surrounding areas before disconnecting the pipes in order to avoid possible contamination of the fuel/EVAP system. 3. Disconnect the fuel feed pipe (3) at the fuel rail (2). 4. Disconnect the EVAP canister purge pipe (1, 4). 5. Cap the fuel rail and EVAP pipes in order to prevent possible contamination of the EVAP/fuel system. 6. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 7. Remove the nuts securing the left catalytic converter to the exhaust manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation > Page 8548 8. Remove the nuts securing the right catalytic converter to the exhaust manifold. 9. Lower the catalytic converter assembly until it rests on the vehicle frame. 10. Use the following procedure if the vehicle is equipped with 2-wheel drive (2WD): 1. Support the transmission with a suitable transmission jack. 2. Remove the transmission support. 3. Lower the transmission slightly. 4. Remove the EVAP/fuel hose/pipe assembly from the retaining clips (1) on the transmission. 11. Use the following procedure if the vehicle is equipped with 4-wheel drive (4WD): Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation > Page 8549 1. Remove the front propeller shaft. 2. Remove the transfer case. 3. Support the transmission with a suitable transmission jack. 4. Remove the transmission support. 5. Lower the transmission slightly. 6. Remove the EVAP/fuel hose/pipe assembly from the retaining clips (1) on the transmission. 12. Remove the EVAP/fuel hose/pipe bracket nut (5). 13. Remove the fuel hose/pipe bracket (6) from the bellhousing stud. 14. Disconnect the EVAP pipe (2) from the fuel tank. 15. Disconnect the fuel feed pipe (1) from the fuel tank. 16. Cap the fuel and EVAP pipes at the fuel tank. 17. Remove the EVAP/fuel hose/pipe assembly from the vehicle. 18. Remove the EVAP/fuel hose/pipe assembly retaining clips. IMPORTANT: Note the position of the EVAP/fuel hose/pipe assembly clips prior to disassembly. 19. Remove the fuel feed or return pipe to be replaced from the EVAP/fuel hose/pipe assembly. INSTALLATION PROCEDURE 1. Install the fuel feed or return pipe to the EVAP/fuel hose/pipe assembly. 2. Install the EVAP/fuel hose/pipe assembly retaining clips. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation > Page 8550 3. Install the EVAP/fuel hose/pipe assembly to the vehicle. 4. Remove the caps from the fuel filter and pipes at the fuel tank. 5. Connect the EVAP pipe (2) to the fuel tank. 6. Connect the fuel feed pipe (1) to the fuel tank. 7. Install the EVAP/fuel hose/pipe bracket (6) to the bellhousing stud. 8. Install the EVAP/fuel hose/pipe bracket nut (5). NOTE: Refer to Fastener Notice. Tighten the nut to 10 N.m (89 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation > Page 8551 9. Use the following procedure if the vehicle is equipped with 4WD: 1. Install the EVAP/fuel hose/pipe assembly to the retaining clips (1) on the transmission. 2. Raise the transmission to the normal installed height. 3. Install the transmission support. 4. Remove the transmission jack. 5. Install the transfer case. 6. Install the front propeller shaft. 10. Use the following procedure if the vehicle is equipped with 2WD: 1. Install the EVAP/fuel hose/pipe assembly to the retaining clips (1) on the transmission. 2. Raise the transmission to the normal installed height. 3. Install the transmission support. 4. Remove the transmission jack. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation > Page 8552 11. Install the nuts securing the right catalytic converter to the exhaust manifold. Tighten the nuts to 50 N.m (37 lb ft). 12. Install the nuts securing the left catalytic converter to the exhaust manifold. Tighten the nuts to 50 N.m (37 lb ft). 13. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Return Line > Component Information > Description and Operation > Page 8553 14. Remove the caps from the fuel rail and EVAP pipes. 15. Connect the EVAP canister purge pipe (1,4). 16. Connect the fuel feed pipe (3) at the fuel rail (2). 17. Install the fuel fill cap. 18. Connect the negative battery cable. 19. Use the following procedure to inspect for leaks: 1. Turn the ignition ON, with the engine OFF, for 2 seconds. 2. Turn the ignition OFF for 10 seconds. 3. Turn the ignition ON, with the engine OFF. 4. Inspect for leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation Fuel Supply Line: Description and Operation NYLON FUEL PIPES CAUTION: Refer to Fuel and EVAP Pipe Caution in Service Precautions. Nylon pipes are constructed to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. There are 3 sizes of nylon pipes used: - 9.5 mm (3/8 in) ID for the fuel supply - 7.6 mm (5/16 in) ID for the fuel return - 12.7 mm (1/2 in) ID for the vent Heat resistant rubber hose or corrugated plastic conduit protects the sections of the pipes that are exposed to chafing, to high temperatures, or to vibration. Nylon fuel pipes are somewhat flexible and can be formed around gradual turns under the vehicle. However, if nylon fuel pipes are forced into sharp bends, the pipes kink and restrict the fuel flow. Also, once exposed to fuel, nylon pipes may become stiffer and are more likely to kink if bent too far. Take special care when working on a vehicle with nylon fuel pipes. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation > Page 8557 Fuel Supply Line: Service and Repair FUEL HOSE/PIPES REPLACEMENT - CHASSIS REMOVAL PROCEDURE 1. Disconnect the negative battery cable. 2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure. IMPORTANT: Clean the fuel/evaporative emissions (EVAP) pipe connections and surrounding areas before disconnecting the pipes in order to avoid possible contamination of the fuel/EVAP system. 3. Disconnect the fuel feed pipe (3) at the fuel rail (2). 4. Disconnect the EVAP canister purge pipe (1, 4). 5. Cap the fuel rail and EVAP pipes in order to prevent possible contamination of the EVAP/fuel system. 6. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 7. Remove the nuts securing the left catalytic converter to the exhaust manifold. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation > Page 8558 8. Remove the nuts securing the right catalytic converter to the exhaust manifold. 9. Lower the catalytic converter assembly until it rests on the vehicle frame. 10. Use the following procedure if the vehicle is equipped with 2-wheel drive (2WD): 1. Support the transmission with a suitable transmission jack. 2. Remove the transmission support. 3. Lower the transmission slightly. 4. Remove the EVAP/fuel hose/pipe assembly from the retaining clips (1) on the transmission. 11. Use the following procedure if the vehicle is equipped with 4-wheel drive (4WD): Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation > Page 8559 1. Remove the front propeller shaft. 2. Remove the transfer case. 3. Support the transmission with a suitable transmission jack. 4. Remove the transmission support. 5. Lower the transmission slightly. 6. Remove the EVAP/fuel hose/pipe assembly from the retaining clips (1) on the transmission. 12. Remove the EVAP/fuel hose/pipe bracket nut (5). 13. Remove the fuel hose/pipe bracket (6) from the bellhousing stud. 14. Disconnect the EVAP pipe (2) from the fuel tank. 15. Disconnect the fuel feed pipe (1) from the fuel tank. 16. Cap the fuel and EVAP pipes at the fuel tank. 17. Remove the EVAP/fuel hose/pipe assembly from the vehicle. 18. Remove the EVAP/fuel hose/pipe assembly retaining clips. IMPORTANT: Note the position of the EVAP/fuel hose/pipe assembly clips prior to disassembly. 19. Remove the fuel feed or return pipe to be replaced from the EVAP/fuel hose/pipe assembly. INSTALLATION PROCEDURE 1. Install the fuel feed or return pipe to the EVAP/fuel hose/pipe assembly. 2. Install the EVAP/fuel hose/pipe assembly retaining clips. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation > Page 8560 3. Install the EVAP/fuel hose/pipe assembly to the vehicle. 4. Remove the caps from the fuel filter and pipes at the fuel tank. 5. Connect the EVAP pipe (2) to the fuel tank. 6. Connect the fuel feed pipe (1) to the fuel tank. 7. Install the EVAP/fuel hose/pipe bracket (6) to the bellhousing stud. 8. Install the EVAP/fuel hose/pipe bracket nut (5). NOTE: Refer to Fastener Notice. Tighten the nut to 10 N.m (89 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation > Page 8561 9. Use the following procedure if the vehicle is equipped with 4WD: 1. Install the EVAP/fuel hose/pipe assembly to the retaining clips (1) on the transmission. 2. Raise the transmission to the normal installed height. 3. Install the transmission support. 4. Remove the transmission jack. 5. Install the transfer case. 6. Install the front propeller shaft. 10. Use the following procedure if the vehicle is equipped with 2WD: 1. Install the EVAP/fuel hose/pipe assembly to the retaining clips (1) on the transmission. 2. Raise the transmission to the normal installed height. 3. Install the transmission support. 4. Remove the transmission jack. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation > Page 8562 11. Install the nuts securing the right catalytic converter to the exhaust manifold. Tighten the nuts to 50 N.m (37 lb ft). 12. Install the nuts securing the left catalytic converter to the exhaust manifold. Tighten the nuts to 50 N.m (37 lb ft). 13. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Supply Line > Component Information > Description and Operation > Page 8563 14. Remove the caps from the fuel rail and EVAP pipes. 15. Connect the EVAP canister purge pipe (1,4). 16. Connect the fuel feed pipe (3) at the fuel rail (2). 17. Install the fuel fill cap. 18. Connect the negative battery cable. 19. Use the following procedure to inspect for leaks: 1. Turn the ignition ON, with the engine OFF, for 2 seconds. 2. Turn the ignition OFF for 10 seconds. 3. Turn the ignition ON, with the engine OFF. 4. Inspect for leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Filler Hose > Component Information > Description and Operation Fuel Filler Hose: Description and Operation FUEL FILL PIPE The fuel fill pipe has a built-in restrictor in order to prevent refueling with leaded fuel. Once the fill vent is obstructed, fuel backs up the fill pipe and trips the dispensing nozzle. The fuel tank vent valves are connected and route to the canister to collect hydrocarbon emissions during operation of the vehicle. FUEL PIPE O-RINGS O-rings seal the threaded connections in the fuel system. Fuel system O-ring seals are made of special material. Service the O-ring seals with the correct service part. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Filler Hose > Component Information > Description and Operation > Page 8568 Fuel Filler Hose: Service and Repair FILLER TUBE REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel fill cap. 2. Remove the fuel fill pipe housing. 3. Remove the fuel fill pipe bracket nuts (2). 4. Raise and suitably support the vehicle. Refer to Vehicle Lifting. 5. Disconnect the fuel filler pipe recirculation hose from the fuel tank. 6. Loosen the clamp securing the fuel fill pipe to the fuel tank. 7. Disconnect the fuel fill pipe from the fuel tank. 8. Cap the open end of the fuel fill hose. 9. Remove the fuel fill pipe ground strap bolt. 10. Remove the push-pin retainer and remove the fuel fill pipe from the vehicle frame. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Filler Hose > Component Information > Description and Operation > Page 8569 1. Install the fuel fill pipe to the vehicle frame and install the push-pin retainer. 2. Install the fuel fill pipe ground strap bolt. NOTE: Refer to Fastener Notice. Tighten the bolt to 10 N.m (89 lb in). 3. Uncap the fuel fill hose. 4. Connect the fuel fill pipe to the fuel tank. Tighten the clamp to 2.5 N.m (22 lb in). 5. Connect the fuel filler pipe recirculation hose to the fuel tank. 6. Lower the vehicle. 7. Install the fuel fill pipe bracket nuts (2). Tighten the nuts to 10 N.m (89 lb in). 8. Install the fuel fill pipe housing. 9. Install the fuel fill cap. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Filler Neck > Component Information > Technical Service Bulletins > Fuel System - Fuel Filler Neck Flapper Door Elimination Fuel Filler Neck: Technical Service Bulletins Fuel System - Fuel Filler Neck Flapper Door Elimination Bulletin No.: 06-06-04-006 Date: January 30, 2006 INFORMATION Subject: Elimination of Fuel Filler Tube Flapper Door Models: 2006 GM Passenger Cars and Light Duty Trucks 2006 HUMMER H2, H3 2006 Saab 9-7X Attention: The flapper door located in the fuel filler neck has been eliminated on the current Buick LaCrosse (Buick Allure, Canada Only) in production. This change will be progressively rolled into the other GM products listed above. Do Not attempt to change the fuel filler tube because the flapper is not present. New Metal Fuel Filler Tubes Without a Flapper Door A revised style of fuel filler tube has changed materials from plastic to metal construction. On plastic fuel filler necks, the metal flapper was included as a safe discharge point for static electricity. With the metal style of fuel filler tube, the entire neck serves as the static discharge point making the flapper redundant. Important: Do Not attempt to change the fuel filler tube because the flapper is not present. Replacement fuel filler tubes will not be equipped with the flapper. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Gauge Sender > Component Information > Diagrams Fuel Pump And Sender Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Gauge Sender > Component Information > Diagrams > Page 8577 Fuel Gauge Sender: Description and Operation FUEL SENDER ASSEMBLY The fuel sender assembly consists of the following major components: - The fuel level sensor - The fuel tank pressure (FTP) sensor - The fuel tank fuel pump module - The fuel strainer - The fuel filter Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Gauge Sender > Component Information > Diagrams > Page 8578 Fuel Gauge Sender: Service and Repair FUEL SENDER ASSEMBLY REPLACEMENT TOOLS REQUIRED J 45722 Fuel Tank Sending Unit Wrench REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Remove the fuel feed (1) and EVAP (2) lines from the fuel sender assembly. 3. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. Turn the fuel sender lock ring in a counterclockwise direction. NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring. - Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints. IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Gauge Sender > Component Information > Diagrams > Page 8579 4. Remove the fuel sender assembly (2) and seal (3). Discard the seal. 5. Clean the fuel sender sealing surfaces (4). CAUTION: Refer to Fuel Storage Caution. 6. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. IMPORTANT: Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped. - Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring. - Check the lock ring for flatness. 7. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement. 8. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Gauge Sender > Component Information > Diagrams > Page 8580 1. Install a NEW seal (3) onto the fuel tank. IMPORTANT: Never reuse the old seal or a fuel leak may occur. Always use a NEW seal. 2. Install the fuel sender assembly (2). IMPORTANT: Place the fuel pump strainer in a horizontal position when you install the fuel sender in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm. 3. Use the J 45722 in order to install the fuel sender lock ring. Turn the fuel sender lock ring in a clockwise direction. IMPORTANT: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. Do not apply any type of lubrication in the seal groove. Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank > Fuel Gauge Sender > Component Information > Diagrams > Page 8581 4. Install the fuel feed (1) and EVAP (2) lines to the sender assembly. 5. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank Unit > Component Information > Diagrams Fuel Pump And Sender Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank Unit > Component Information > Diagrams > Page 8585 Fuel Tank Unit: Service and Repair FUEL SENDER ASSEMBLY REPLACEMENT TOOLS REQUIRED J 45722 Fuel Tank Sending Unit Wrench REMOVAL PROCEDURE 1. Remove the fuel tank. 2. Remove the fuel feed (1) and EVAP (2) lines from the fuel sender assembly. 3. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. Turn the fuel sender lock ring in a counterclockwise direction. NOTE: Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring. - Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints. IMPORTANT: Do NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank Unit > Component Information > Diagrams > Page 8586 4. Remove the fuel sender assembly (2) and seal (3). Discard the seal. 5. Clean the fuel sender sealing surfaces (4). CAUTION: Refer to Fuel Storage Caution. 6. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. IMPORTANT: Some lock ring were manufactured with DO NOT REUSE stamped into them. These lock rings may be reused if they are not damaged or warped. - Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring. - Check the lock ring for flatness. 7. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement. 8. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank Unit > Component Information > Diagrams > Page 8587 1. Install a NEW seal (3) onto the fuel tank. IMPORTANT: Never reuse the old seal or a fuel leak may occur. Always use a NEW seal. 2. Install the fuel sender assembly (2). IMPORTANT: Place the fuel pump strainer in a horizontal position when you install the fuel sender in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm. 3. Use the J 45722 in order to install the fuel sender lock ring. Turn the fuel sender lock ring in a clockwise direction. IMPORTANT: Always replace the fuel sender seal when installing the fuel sender assembly. Replace the lock ring if necessary. Do not apply any type of lubrication in the seal groove. Ensure the lock ring is installed with the correct side facing upward. A correctly installed lock ring will only turn in a clockwise direction. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Fuel Tank Unit > Component Information > Diagrams > Page 8588 4. Install the fuel feed (1) and EVAP (2) lines to the sender assembly. 5. Install the fuel tank. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 8592 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations Fuel Pump Relay: Locations Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 8597 Application Table Part (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 8598 Application Table (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Locations > Page 8599 Location View Location View Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions Fuel Pump Relay: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8602 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8603 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8604 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8605 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8606 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8607 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8608 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8609 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8610 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8611 Fuel Pump Relay: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8612 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8613 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8614 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8615 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8616 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8617 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8618 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8619 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8620 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8621 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8622 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8623 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8624 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8625 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8626 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8627 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8628 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8629 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8630 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8631 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8632 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8633 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8634 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8635 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8636 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8637 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8638 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8639 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8640 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8641 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8642 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8643 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8644 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8645 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8646 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8647 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8648 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8649 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8650 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8651 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8652 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8653 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8654 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8655 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8656 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8657 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8658 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8659 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8660 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8661 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8662 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8663 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8664 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8665 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8666 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8667 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8668 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8669 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8670 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8671 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8672 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8673 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Diagram Information and Instructions > Page 8674 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection Main Relay (Computer/Fuel System): Testing and Inspection POWERTRAIN RELAY DIAGNOSIS DIAGNOSTIC FAULT INFORMATION Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures TYPICAL SCAN TOOL DATA EC Ignition Relay Feedback Signal CIRCUIT/SYSTEM DESCRIPTION The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the following fuses in the underhood fuse block: The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The ignition 1 voltage that is supplied to the ECM through the TAC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed. DIAGNOSTIC AIDS - This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Non-HP2). - When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness. - Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. CIRCUIT/SYSTEM VERIFICATION 1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command. 2. With the ignition ON, engine OFF, probe both test points of each of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate, continue with Circuit/System Testing. CIRCUIT/SYSTEM TESTING 1. With the ignition OFF, remove the powertrain relay from the underhood fuse block. 2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Relays and Modules - Fuel Delivery and Air Induction > Main Relay (Computer/Fuel System) > Component Information > Testing and Inspection > Page 8678 less than 2 ohms. 3. Measure for voltage between the relay coil control circuit and ground. - If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM. 4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states. If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM. - If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. 5. Measure for B+ between the relay armature supply circuit, and ground. - If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms. 6. With the ignition ON, test for voltage on each test point of the TAC fuse in the underhood fuse block. - If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain relay, and the TAC fuse for a short to voltage. - If both circuits test normal, replace the ECM. 7. Connect a 20 amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain relay at the underhood fuse block. With a test lamp, probe both test points of the TAC fuse. If the test lamp illuminates at both test points of the TAC fuse, repair the ignition 1 voltage circuit between the powertrain relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms. - If the test lamp only illuminates at one test point of the TAC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. - If the test lamp does not illuminate on either test point of the TAC fuse, repair the open or high resistance between the powertrain relay and the TAC fuse. All wire circuit resistance should measure 2 ohms or less. 8. With a test lamp, test for voltage on both test points of the following fuses: - The ENG 1 fuse - The TAC fuse - The INJ A fuse - The INJ B fuse - The O2A fuse - The O2B fuse - If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain relay. All wire circuit resistance should measure 2 ohms or less. COMPONENT TESTING - Measure for 70-110 ohms between terminals 85 and 86 of the relay. If the resistance is not within the specified range, replace the relay. - Measure for infinite resistance between terminals 30 and 86 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 87 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 30 and 85 of the relay. If continuity is detected, replace the relay. - Measure for infinite resistance between terminals 85 and 87 of the relay. If continuity is detected, replace the relay. - Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM. If the resistance measures more than 2 ohms, replace the relay. REPAIR INSTRUCTIONS IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) - Underhood Electrical Center or Junction Block Replacement - Engine Control Module Programming and Setup Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Resonator, Intake Air > Component Information > Service and Repair Resonator: Service and Repair AIR CLEANER RESONATOR OUTLET DUCT REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield. 2. Disconnect the positive crankcase ventilation (PCV) fresh air tube (2) from the air cleaner resonator outlet duct (1). 3. Loosen the air cleaner outlet duct clamps at the mass air flow (MAF)/intake air temperature (IAT) sensor, and the throttle body. 4. Grasp the air cleaner outlet duct near the stud and firmly lift up, disengaging the duct from the stud. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Resonator, Intake Air > Component Information > Service and Repair > Page 8682 1. Install the air cleaner outlet duct to the MAF/IAT sensor and the throttle body. 2. Ensure that the air cleaner outlet duct flange is seated over the stud and firmly push down, securing the duct to the stud. 3. Tighten the air cleaner outlet duct clamps. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the clamps to 7 N.m (62 lb in). 4. Connect the PCV fresh air tube (2) to the air cleaner resonator outlet duct (1). 5. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations Accelerator And Brake Pedals Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8687 Accelerator Pedal Position (APP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8688 Accelerator Pedal Position Sensor: Description and Operation ACCELERATOR PEDAL POSITION (APP) SENSOR The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits: - A 5-volt reference circuit - A low reference circuit - A signal circuit The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8689 Accelerator Pedal Position Sensor: Service and Repair ACCELERATOR PEDAL WITH POSITION SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Disconnect the accelerator pedal position (APP) sensor electrical connector. NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. 2. Remove the 3 APP sensor bolts (1). 3. Remove the APP sensor (2). INSTALLATION PROCEDURE 1. Install the APP sensor. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Accelerator Pedal Position Sensor > Component Information > Locations > Page 8690 NOTE: Refer to Fastener Notice. 2. Install the 3 APP sensor bolts (1). Tighten the bolts to 20 N.m (15 lb ft). 3. Connect the APP sensor electrical connector. 4. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 5. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Locations Upper Right Side Of The Engine - Front Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions Air Flow Meter/Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8696 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8697 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8698 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8699 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8700 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8701 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8702 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8703 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8704 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8705 Air Flow Meter/Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8706 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8707 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8708 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8709 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8710 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8711 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8712 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8713 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8714 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8715 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8716 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8717 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8718 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8719 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8720 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8721 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8722 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8723 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8724 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8725 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8726 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8727 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8728 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8729 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8730 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8731 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8732 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8733 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8734 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8735 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8736 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8737 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8738 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8739 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8740 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8741 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8742 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8743 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8744 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8745 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8746 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8747 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8748 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8749 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8750 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8751 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8752 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8753 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8754 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8755 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8756 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8757 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8758 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8759 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8760 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8761 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8762 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8763 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8764 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8765 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8766 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8767 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8768 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8769 Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 8770 Air Flow Meter/Sensor: Service and Repair MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT REMOVAL PROCEDURE IMPORTANT: Use care when handling the mass air flow/intake air temperature (MAF/IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation. 1. Disconnect the MAF/IAT sensor electrical connector. 2. Loosen the clamps at the MAF/IAT sensor and the throttle body. 3. Remove the air cleaner outlet duct bolt. 4. Remove the air cleaner outlet duct. 5. Loosen the clamp attaching the MAF/IAT sensor to the air cleaner housing. 6. Remove the MAF/IAT sensor from the air cleaner housing. INSTALLATION PROCEDURE IMPORTANT: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 8771 1. Locate the air flow direction arrow (2) on the MAF/IAT sensor. 2. Install the MAF/IAT sensor on to the air cleaner housing. NOTE: Refer to Fastener Notice in Service Precautions. 3. Tighten the clamp securing the MAF/IAT sensor to the air cleaner housing. Tighten the clamp to 7 N.m (62 lb in). 4. Install the air cleaner outlet duct. 5. Install the air cleaner outlet duct bolt. Tighten the bolt to 10 N.m (89 lb in). 6. Tighten the clamps at the MAF/IAT sensor and the throttle body. Tighten the clamps to 7 N.m (62 lb in). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Air Flow Meter/Sensor > Component Information > Diagrams > Page 8772 7. Connect the MAF/IAT electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8777 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8778 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8779 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8780 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8781 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8782 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8783 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8784 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8785 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8786 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8787 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8788 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8789 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8790 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8791 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8792 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8793 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8794 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8795 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8796 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8797 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8798 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8799 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8800 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8801 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8802 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8803 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8804 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8805 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8806 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8807 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8808 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8809 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8810 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8811 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8812 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8813 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8814 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8815 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8816 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8817 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8818 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8819 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8820 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8821 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8822 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8823 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8824 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8825 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8826 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8827 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8828 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8829 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8830 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8831 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8832 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8833 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8834 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8835 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8836 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8837 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8838 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8839 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8840 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8841 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8842 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8843 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8844 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8845 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8846 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8847 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8848 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8849 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Body > Component Information > Diagrams Throttle Body Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Body > Component Information > Diagrams > Page 8853 Throttle Body: Description and Operation THROTTLE BODY ASSEMBLY The throttle assembly contains the following components: - The throttle blade - The throttle actuator motor - The throttle position (TP) sensor 1 and 2 The throttle body functions similar to a conventional throttle body with the following exceptions: - An electric motor opens and closes the throttle valve. - The throttle blade is spring loaded in both directions and the default position is slightly open. - There are 2 individual TP sensors within the throttle body assembly. The TP sensors are used to determine the throttle plate angle. The TP sensors provide the engine control module (ECM) with a signal voltage proportional to throttle plate movement. The TP sensor 1 signal voltage at closed throttle is above 4 volts and decreases as the throttle plate is opened. The TP sensor 2 signal voltage at closed throttle is below 1 volt and increases as the throttle plate is opened. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Body > Component Information > Service and Repair > Throttle Body Assembly Replacement Throttle Body: Service and Repair Throttle Body Assembly Replacement THROTTLE BODY ASSEMBLY REPLACEMENT REMOVAL PROCEDURE 1. Partially drain the cooling system in order to allow the hose at the throttle body to be removed. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2). NOTE: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type. IMPORTANT: DO NOT for any reason, insert a screwdriver or other small hand tool into the throttle body to hold open the throttle plate, as the throttle body could be damaged. - An 8-digit part identification number is stamped on the throttle body casting. Refer to this number if servicing, or part replacement is required. 2. Remove the air cleaner outlet duct. 3. Disconnect the throttle actuator motor electrical connector (1) from the throttle actuator motor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Body > Component Information > Service and Repair > Throttle Body Assembly Replacement > Page 8856 4. Reposition the throttle body hose clamp. 5. Remove both of the throttle body engine coolant hoses from the throttle body. 6. Remove the throttle body bolts (538) and nuts (507). 7. Remove the throttle body (508) and gasket (509). Discard the gasket. IMPORTANT: Do not reuse the throttle body gasket. Install a new gasket during assembly. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Body > Component Information > Service and Repair > Throttle Body Assembly Replacement > Page 8857 1. Install a NEW throttle body gasket (509). 2. Install the throttle body (508). 3. Install the throttle body bolts (538) and nuts (507). NOTE: Refer to Fastener Notice. Tighten the bolts/nuts to 6 N.m (53 lb in). 4. Connect the 2 throttle body engine coolant hoses to the throttle body. 5. Position the throttle body hose clamps. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Body > Component Information > Service and Repair > Throttle Body Assembly Replacement > Page 8858 6. Connect the throttle actuator motor electrical connector (1) to the throttle actuator motor (2). 7. Install the air cleaner outlet duct. 8. Refill the cooling system. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling System (LH6, LS2). 9. Verify that the vehicle meets the following conditions: - The vehicle is not in a reduced engine power mode. - The ignition is ON. - The engine is OFF. 10. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range. 11. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT). 12. Start the engine. 13. Inspect for coolant leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Body > Component Information > Service and Repair > Throttle Body Assembly Replacement > Page 8859 Throttle Body: Service and Repair Throttle Body Cleaning THROTTLE BODY CLEANING PROCEDURE 1. Remove the air cleaner resonator outlet duct. CAUTION: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury . NOTE: Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate. 2. Inspect the throttle body bore and the throttle valve plate for deposits. It is necessary to open the throttle valve in order to inspect all surfaces. NOTE: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components. 3. Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or ACDelco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product. 4. Install the air cleaner resonator outlet duct. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Throttle Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8864 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8865 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8866 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8867 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8868 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8869 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8870 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8871 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8872 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8873 Throttle Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8874 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8875 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8876 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8877 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8878 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8879 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8880 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8881 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8882 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8883 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8884 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8885 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8886 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8887 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8888 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8889 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8890 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8891 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8892 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8893 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8894 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8895 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8896 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8897 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8898 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8899 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8900 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8901 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8902 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8903 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8904 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8905 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8906 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8907 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8908 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8909 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8910 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8911 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8912 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8913 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8914 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8915 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8916 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8917 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8918 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8919 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8920 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8921 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8922 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8923 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8924 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8925 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8926 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8927 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8928 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8929 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8930 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8931 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8932 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8933 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8934 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8935 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8936 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8943 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8944 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8945 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8946 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8947 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8948 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8949 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8950 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8951 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8952 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8953 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8954 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8955 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8956 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8957 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8958 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8959 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8960 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8961 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8962 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8963 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8964 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8965 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8966 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8967 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8968 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8969 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8970 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8971 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8972 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8973 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8974 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8975 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8976 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8977 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8978 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8979 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8980 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8981 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8982 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8983 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8984 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8985 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8986 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8987 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8988 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8989 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8990 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8991 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8992 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8993 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8994 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8995 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8996 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8997 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8998 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 8999 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9000 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9001 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9002 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9003 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9004 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9005 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9006 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9007 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9008 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9009 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9010 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9011 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9012 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9013 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9014 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9015 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9016 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 9017 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 9018 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 9019 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9025 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9026 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9027 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9028 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9029 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9030 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9031 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9032 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9033 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9034 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9035 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9036 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9037 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9038 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9039 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9040 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9041 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9042 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9043 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9044 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9045 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9046 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9047 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9048 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9049 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9050 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9051 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9052 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9053 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9054 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9055 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9056 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9057 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9058 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9059 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9060 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9061 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9062 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9063 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9064 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9065 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9066 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9067 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9068 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9069 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9070 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9071 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9072 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9073 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9074 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9075 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9076 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9077 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9078 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9079 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9080 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9081 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9082 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9083 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9084 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9085 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9086 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9087 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9088 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9089 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9090 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9091 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9092 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9093 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9094 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9095 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9096 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9097 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9098 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Page 9099 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 9102 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 9103 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Cable > Component Information > Specifications Ignition Cable: Specifications Spark Plug Wire Resistance................................................................................................................. ................................................397 - 1,337 ohms per ft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Cable > Component Information > Specifications > Page 9107 Ignition Cable: Testing and Inspection SPARK PLUG WIRE INSPECTION Spark plug wire integrity is vital for proper engine operation. A thorough inspection is necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions: 1. Correct routing of the spark plug wires - Incorrect routing may cause cross-firing. 2. Any signs of cracks or splits in the wires. 3. Inspect each boot for the following conditions: - Tearing - Piercing - Arcing - Carbon tracking - Corroded terminal If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or terminal, replace the wire and the component connected to the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Cable > Component Information > Specifications > Page 9108 Ignition Cable: Service and Repair SPARK PLUG WIRE REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield, if necessary. 2. Remove the spark plug wire from the spark plug. - Twist each spark plug 1/2 turn. - Pull only on the boot in order to remove the wire from each spark plug. 3. Remove the spark plug wire from the ignition coil. - Twist each spark plug boot 1/2 turn. - Pull only on the boot in order to remove the wires from the ignition coil. INSTALLATION PROCEDURE 1. Install the spark plug wire to the ignition coil. 2. Install the spark plug wire to the spark plug. 3. Inspect the wires for proper installation: - Push sideways on each boot in order to inspect the seating. - Reinstall any loose boot. 4. Install the intake manifold sight shield, if necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams Ignition Coil: Diagrams Ignition Coil 1 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9112 Ignition Coil 2 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9113 Ignition Coil 3 Ignition Coil 4 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9114 Ignition Coil 5 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9115 Ignition Coil 6 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9116 Ignition Coil 7 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9117 Ignition Coil 8 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9118 Ignition Coil: Description and Operation IGNITION COILS Each ignition coil has an ignition 1 voltage feed and a ground. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9119 Ignition Coil: Service and Repair IGNITION COIL(S) REPLACEMENT REMOVAL PROCEDURE 1. Remove the intake manifold sight shield. 2. Remove the spark plug wire from the ignition coil. 3. Disconnect the ignition coil electrical connector. 4. Remove the ignition coil bolts. 5. Remove the ignition coil. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Ignition Coil > Component Information > Diagrams > Page 9120 1. Install the ignition coil. 2. Install the ignition coil bolts. NOTE: Refer to Fastener Notice. Tighten the bolts to 8 N.m (71 lb in). 3. Connect the ignition coil electrical connector. 4. Connect the spark plug wire to the ignition coil. 5. Install the intake manifold sight shield. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Locations > Page 9124 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9127 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9128 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9129 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9130 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9131 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9132 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9133 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9134 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9135 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9136 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9137 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9138 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9139 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9140 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9141 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9142 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9143 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9144 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9145 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9146 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9147 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9148 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9149 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9150 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9151 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9152 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9153 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9154 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9155 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9156 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9157 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9158 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9159 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9160 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9161 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9162 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9163 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9164 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9165 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9166 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9167 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9168 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9169 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9170 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9171 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9172 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9173 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9174 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9175 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9176 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9177 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9178 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9179 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9180 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9181 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9182 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9183 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9184 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9185 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9186 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9187 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9188 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9189 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9190 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9191 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9192 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9193 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9194 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9195 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9196 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9197 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9198 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9199 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9200 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Diagrams > Page 9201 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 9204 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Locations Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Camshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9211 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9212 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9213 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9214 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9215 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9216 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9217 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9218 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9219 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9220 Camshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9221 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9222 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9223 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9224 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9225 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9226 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9227 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9228 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9229 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9230 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9231 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9232 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9233 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9234 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9235 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9236 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9237 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9238 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9239 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9240 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9241 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9242 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9243 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9244 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9245 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9246 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9247 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9248 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9249 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9250 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9251 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9252 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9253 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9254 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9255 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9256 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9257 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9258 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9259 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9260 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9261 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9262 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9263 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9264 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9265 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9266 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9267 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9268 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9269 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9270 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9271 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9272 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9273 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9274 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9275 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9276 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9277 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9278 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9279 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9280 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9281 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9282 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9283 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9284 Camshaft Position (CMP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 9285 Camshaft Position Sensor: Description and Operation CAMSHAFT POSITION (CMP) SENSOR The camshaft position (CMP) sensor is also a magneto resistive sensor, with the same type of circuits as the crankshaft position (CKP) sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the engine control module (ECM) to determine the position of the valve train relative to the CKP. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 9286 Camshaft Position Sensor: Service and Repair CAMSHAFT POSITION (CMP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the generator bracket assembly. 2. Remove the camshaft position sensor mounting bolts (1). 3. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7). 4. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors. 5. Remove the camshaft sensor assembly (4, 5, 6). 6. Disconnect camshaft position sensor (5) from the jumper harness (4). INSTALLATION PROCEDURE 1. Reconnect the camshaft sensor (5) and the jumper harness (4). 2. Install the O-ring (6) on the camshaft sensor assembly (4 and 5). 3. Reconnect the camshaft position sensor assembly (4, 5 and 6) and the engine harness connector (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Camshaft Position Sensor > Component Information > Diagrams > Page 9287 4. Install the camshaft position sensor assembly (4, 5 and 6) in the front cover (7). IMPORTANT: Before installing the camshaft sensor assembly, apply a small amount of clean motor oil to the O-ring (6). 5. Install the camshaft position sensor mounting bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the camshaft position mounting bolts 25 N.m (18 lb ft). 6. Install the generator assembly. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Locations Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions Crankshaft Position Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9293 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9294 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9295 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9296 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9297 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9298 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9299 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9300 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9301 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9302 Crankshaft Position Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9303 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9304 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9305 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9306 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9307 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9308 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9309 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9310 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9311 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9312 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9313 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9314 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9315 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9316 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9317 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9318 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9319 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9320 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9321 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9322 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9323 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9324 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9325 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9326 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9327 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9328 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9329 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9330 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9331 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9332 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9333 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9334 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9335 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9336 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9337 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9338 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9339 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9340 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9341 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9342 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9343 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9344 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9345 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9346 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9347 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9348 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9349 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9350 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9351 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9352 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9353 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9354 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9355 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9356 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9357 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9358 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9359 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9360 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9361 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9362 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9363 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9364 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9365 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9366 Crankshaft Position (CKP) Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Diagrams > Page 9367 Crankshaft Position Sensor: Description and Operation CRANKSHAFT POSITION (CKP) SENSOR The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The engine control module (ECM) supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement Crankshaft Position Sensor: Service and Repair Crankshaft Position Sensor Replacement CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT REMOVAL PROCEDURE 1. Remove the starter. IMPORTANT: Perform CKP System Variation Learn Procedure whenever the crankshaft position (CKP) sensor is removed or replaced. 2. Disconnect the electrical connector (2) from the CKP sensor (1). 3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine. 4. Remove the CKP sensor bolt. 5. Remove the CKP sensor. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 9370 1. Install the CKP sensor. 2. Install the CKP sensor bolt. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt to 25 N.m (18 lb ft). 3. Connect the electrical connector (2) to the CKP sensor (1). 4. Install the starter. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Crankshaft Position Sensor > Component Information > Service and Repair > Crankshaft Position Sensor Replacement > Page 9371 Crankshaft Position Sensor: Service and Repair Crankshaft Position System Variation Learn CKP SYSTEM VARIATION LEARN PROCEDURE 1. Install a scan tool. 2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. Select the crankshaft position (CKP) variation learn procedure with a scan tool. 4. The scan tool instructs you to perform the following: 1. Accelerate to wide open throttle (WOT). 2. Release throttle when fuel cut-off occurs. 3. Observe fuel cut-off for applicable engine. 4. Engine should not accelerate beyond calibrated RPM value. 5. Release throttle immediately if value is exceeded. 6. Block drive wheels. 7. Set parking brake. 8. DO NOT apply brake pedal. 9. Cycle ignition from OFF to ON. 10. Apply and hold brake pedal. 11. Start and idle engine. 12. Turn A/C OFF. 13. Vehicle must remain in Park or Neutral. 14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. - Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. - Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. 5. Enable the CKP system variation learn procedure with a scan tool. 6. Accelerate to WOT. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 7. Release when the fuel cut-off occurs. 8. Test in progress 9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully. 11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement - An engine replacement - A ECM replacement - A harmonic balancer replacement - A crankshaft replacement - Any engine repairs which disturb the CKP sensor relationship Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: Customer Interest A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Customer Interest for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 9381 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Ignition Switch Lock Cylinder: All Technical Service Bulletins A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Ignition Switch Lock Cylinder: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 9387 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Technical Service Bulletins > Page 9388 Ignition Switch Lock Cylinder: Description and Operation KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding Ignition Switch Lock Cylinder: Service and Repair Key and Lock Cylinder Coding KEY AND LOCK CYLINDER CODING USE INSTRUCTION SHEET SUPPLIED For the key cutting and lock cylinder coding procedure, refer to the instruction sheet supplied in the key and lock cylinder kit. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 9391 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Replacement Ignition Lock Cylinder Replacement Removal Procedure 1. Disconnect the negative battery cable. 2. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 3. Lower the hush and knee bolster. 4. Remove the steering column trim covers. 5. With the key installed, turn the key to the RUN position. 6. Install an allen wrench into the hole on top of the lock cylinder housing. Push down on the allen wrench to release the tab on the lock cylinder inside the lock cylinder housing. 7. Slide the lock cylinder out of the lock cylinder housing. Installation Procedure 1. Install the key into the lock cylinder. 2. Use a screwdriver to rotate the lock cylinder housing gear clockwise to the start position allowing it to spring return into the RUN position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 9392 Important: The gears between the ignition switch and the lock cylinder housing must be in the correct position. Failure to do so will cause a misalignment of the gears in the ignition switch and the lock cylinder housing, which may result in a NO START or BATTERY DRAIN. 3. Align the lock cylinder and install into the lock cylinder housing. 4. Install the steering column trim covers. 5. Install the hush and knee bolster. 6. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. 7. Connect the negative battery cable. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Ignition Switch > Ignition Switch Lock Cylinder > Component Information > Service and Repair > Key and Lock Cylinder Coding > Page 9393 Ignition Switch Lock Cylinder: Service and Repair Ignition Lock Cylinder Case Replacement Ignition Lock Cylinder Case Replacement Removal Procedure 1. Disable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Caution: Refer to SIR Caution in Service Precautions. 2. Remove the ignition switch. 3. Remove the turn signal cancel cam. 4. Remove the park lock cable from the lock cylinder housing. 5. Remove 3 TORX(R) screws. 6. Remove the lock cylinder housing from the steering column. Installation Procedure 1. Install 3 TORX(R) screws into the lock cylinder housing. Tighten the TORX(R) screws to 7 Nm (62 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 2. Install the turn signal cancel cam. 3. Install the park lock cable into the lock cylinder housing. 4. Install the ignition switch. 5. Enable the SIR system. Refer to SIR Disabling and Enabling in Restraint Systems. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Locations Knock Sensor: Locations Lower Left Side Of Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Locations > Page 9397 Lower Right Side Of The Engine - Rear Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions Knock Sensor: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9400 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9401 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9402 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9403 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9404 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9405 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9406 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9407 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9408 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9409 Knock Sensor: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9410 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9411 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9412 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9413 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9414 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9415 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9416 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9417 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9418 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9419 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9420 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9421 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9422 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9423 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9424 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9425 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9426 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9427 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9428 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9429 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9430 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9431 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9432 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9433 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9434 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9435 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9436 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9437 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9438 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9439 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9440 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9441 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9442 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9443 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9444 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9445 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9446 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9447 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9448 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9449 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9450 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9451 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9452 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9453 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9454 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9455 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9456 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9457 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9458 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9459 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9460 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9461 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9462 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9463 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9464 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9465 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9466 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9467 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9468 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9469 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9470 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9471 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9472 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Diagram Information and Instructions > Page 9473 Knock Sensor: Connector Views Knock Sensor (KS) 1 - Left Knock Sensor (KS) 2 - Right Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Diagrams > Page 9474 Knock Sensor: Description and Operation KNOCK SENSOR (KS) SYSTEM DESCRIPTION PURPOSE The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock. SENSOR DESCRIPTION This knock sensor (KS) system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Left Side) KNOCK SENSOR (KS) REPLACEMENT (LEFT SIDE) REMOVAL PROCEDURE 1. Remove the mounting bolt for the knock sensor 1. 2. Disconnect the electrical connector of the knock sensor from the engine harness (3). 3. Remove the knock sensor (2) from the engine block (4). INSTALLATION PROCEDURE 1. Reconnect the engine harness (3) and the knock sensor (2) electrical connectors. 2. Position the knock sensor 2 on the engine block (4). 3. Install the mounting bolt (1) for the knock sensor 2. 4. Tighten the knock sensor mounting bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the knock sensor mounting bolt to 20 N.m (15 lb ft). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Sensors and Switches - Ignition System > Knock Sensor > Component Information > Service and Repair > Knock Sensor (KS) Replacement (Left Side) > Page 9477 Knock Sensor: Service and Repair Knock Sensor (KS) Replacement (Right Side) KNOCK SENSOR (KS) REPLACEMENT (RIGHT SIDE) REMOVAL PROCEDURE 1. Disconnect the electrical connector (3) from the knock sensor (2). 2. Remove the knock sensor bolt (1). 3. Remove the knock sensor (2) from the engine block. INSTALLATION PROCEDURE 1. Position the knock sensor (2) on the engine block. 2. Install the knock sensor bolt (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the bolt (1) to 20 N.m (15 lb ft). 3. Connect the electrical connector (3) to the knock sensor (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Spark Plug > Component Information > Specifications > Spark Plug Gap Spark Plug: Specifications Spark Plug Gap Spark Plug Gap ................................................................................................................................... .................................................... 1.02 mm (0.040 in.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Spark Plug > Component Information > Specifications > Spark Plug Gap > Page 9482 Spark Plug: Specifications Spark Plug Torque Spark Plug Torque ............................................................................................................................... ................................................... 15 Nm (11.0 lb. ft.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Spark Plug > Component Information > Specifications > Page 9483 Spark Plug: Application and ID SPARK PLUG TYPE GM P/N ................................................................................................................................................ .............................................................. 12571164 AC P/N ................................................................................................................................................. .................................................................. 41-985 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Spark Plug > Component Information > Specifications > Page 9484 Spark Plug: Testing and Inspection SPARK PLUG INSPECTION - Verify that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to Ignition System Specifications for the correct spark plug. - Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions: Spark plug fouling - Colder plug - Pre-ignition causing spark plug and/or engine damage - Hotter plug - Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1) - Test for a loose terminal post (1) by twisting and pulling the post. The terminal post should not move. - Inspect the insulator (2) for flashover or carbon tracking, or soot. This is caused by the electrical charge traveling across the insulator between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. - Inspect the spark plug recess are of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated will cause arcing to ground. - Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3,4). - Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3). An excessively wide electrode gap can prevent correct spark plug operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Spark Plug > Component Information > Specifications > Page 9485 - Inspect for the correct spark plug torque. Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. - Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). - Inspect for a broken or worn side electrode (3). - Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. - A looses center electrode (4) reduces the spark intensity. - Inspect for bridged electrodes (3,4). Deposits on the electrodes (3,4) reduce or eliminates the gap. - Inspect for worn or missing platinum pads on the electrodes (3,4), if equipped. - Inspect for excessive fouling. - Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation. Visual Inspection Normal operation - Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives. - Carbon fouled - Dry, fluffy black carbon, or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors - Excessive fuel pressure - Restricted air filter element - Incorrect combustion - Reduced ignition system voltage output Weak ignition coils - Worn ignition wires - Incorrect spark plug gap - Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off. - Deposit fouling - Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark plug intensity. Most powdery deposits will not affect spark plug intensity unless they form into a glazing over the electrode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Spark Plug > Component Information > Specifications > Page 9486 Spark Plug: Service and Repair SPARK PLUG REPLACEMENT REMOVAL PROCEDURE 1. Remove the spark plug wire. 2. Remove the washer solvent container to gain access to the #2 spark plug. 3. Loosen the spark plug 1-2 turns. 4. Brush or using compressed air, blow away any dirt from around the spark plug. 5. Remove the spark plug.If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number. INSTALLATION PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Ignition System > Spark Plug > Component Information > Specifications > Page 9487 1. Correctly position the spark plug washer. 2. Inspect the spark plug gap. Adjust the gap as needed. Spark plug gap: 1.524 mm (0.060 in) 3. Hand start the spark plug in the corresponding cylinder. 4. Tighten the spark plug. - For used heads, tighten the plug to 15 N.m (11 lb ft). - For NEW heads, tighten the plug to 20 N.m (15 lb ft). NOTE: Refer to Fastener Notice. 5. Install the spark plug wire. 6. If removed, install the washer solvent container. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams Pressure Regulating Solenoid: Diagrams Automatic Transmission Inline 20-Way Connector End View Pressure Control (PC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 9494 Pressure Regulating Solenoid: Service and Repair Pressure Regulator Replacement Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and filter. 3. Compress the reverse boost valve sleeve into the bore of the oil pump to release tension on the reverse boost valve retaining ring. 4. Remove the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 5. Remove the reverse boost valve sleeve (5) and the reverse boost valve (4). 6. Remove the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 7. Remove the pressure regulator valve (1). Installation Procedure 1. Install the pressure regulator valve (1). 2. Install the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 3. Install the reverse boost valve (4) in the reverse boost valve sleeve (5). 4. Install the reverse boost valve (4) and sleeve (5) in the oil pump cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 9495 5. Compress the reverse boost valve sleeve into the bore of the oil pump to expose the retaining ring slot. 6. Install the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 7. Install the transmission oil filter and pan. 8. Lower the vehicle. 9. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 10. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available Shift Interlock Solenoid: Technical Service Bulletins A/T - Shift Lock Control Actuator Available Bulletin No.: 05-07-129-001B Date: February 16, 2007 INFORMATION Subject: Automatic Transmission Shift Lock Control Actuator Available for Service Use Models: 2004-2007 Buick Rainier 2002-2007 Chevrolet TrailBlazer 2002-2006 Chevrolet TrailBlazer EXT 2003-2006 Chevrolet SSR 2002-2007 GMC Envoy 2002-2006 GMC Envoy XL 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada 2003-2007 HUMMER H2 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to update the model years and add the SSR. Please discard Corporate Bulletin Number 05-07-129-001A (Section 07 - Transmission/Transaxle). The automatic transmission shift lock control actuator is now available for service as a separate part. The actuator was formerly available only as part of the entire shifter assembly. DO NOT replace the shifter assembly if the shift lock control actuator requires replacement. Please refer to the Automatic Transmission Shift Lock Control Actuator Replacement procedure in the Automatic Transmission sub-section of the Service Information. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available > Page 9500 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9501 Shift Interlock Solenoid: Locations Shift Lock Control Component Views Automatic Transmission Shift Lock Actuator 1 - Lower Console 2 - Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9502 Shift Interlock Solenoid: Diagrams Shift Lock Control Connector End Views Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9503 Shift Interlock Solenoid: Service and Repair Automatic Transmission Shift Lock Actuator Replacement Important: After assembling the shift lock actuator, turn the ignition forward but do not start (auxiliary position) and attempt to pull the lever from PARK with and without the brake pedal depressed to verify there is no gear access without the brake pedal depressed. Important: Ensure the key cannot be removed from the ignition unless both the shiftier is in PARK and the shift knob button has been depressed. Removal Procedure 1. Remove the console. 2. Disconnect the shift lock actuator (3) electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9504 3. Shift assembly to the LOW position. 4. Loosen and remove the screw at the rear of the shiftier assembly. 5. Shift the assembly to the NEUTRAL position. 6. Loosen and remove the top screw of the shift lock actuator through the lever slot. 7. Pull lever to the DRIVE position and remove the shift lock actuator. Installation Procedure 1. In DRIVE position, depress the shift lock actuator button and realign into the shiftier lever. 2. Push lever to NEUTRAL. 3. Install the top screw through the lever slot. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Shift lever to LOW. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9505 5. Install the screw at the rear of the shiftier assembly. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). 6. Connect the electrical connector (3). 7. Verify the shift lock actuator functions properly. 8. Install the console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications Shift Solenoid Valve State and Gear Ratio Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications > Page 9509 Shift Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Shift Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9512 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9513 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9514 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9515 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9516 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9517 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9518 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9519 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9520 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9521 Shift Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9522 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9523 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9524 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9525 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9526 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9527 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9528 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9529 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9530 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9531 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9532 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9533 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9534 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9535 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9536 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9537 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9538 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9539 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9540 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9541 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9542 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9543 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9544 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9545 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9546 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9547 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9548 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9549 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9550 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9551 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9552 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9553 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9554 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9555 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9556 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9557 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9558 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9559 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9560 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9561 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9562 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9563 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9564 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9565 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9566 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9567 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9568 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9569 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9570 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9571 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9572 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9573 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9574 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9575 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9576 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9577 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9578 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9579 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9580 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9581 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9582 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9583 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9584 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9585 Shift Solenoid: Connector Views Automatic Transmission Internal Connector End Views 1-2 Shift Solenoid (SS) Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9586 2-3 Shift Solenoid (SS) Valve, Wiring Harness Side 3-2 Shift Solenoid (SS) Valve Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 9587 Shift Solenoid: Service and Repair Control and Shift Solenoids Replacement Removal Procedure 1. Remove the transmission oil pan and filter. 2. Remove the 1-2 accumulator if necessary. Important: Do not remove the valve body for the following procedures. Removal of the 1-2 accumulator is necessary only if servicing the pressure control solenoid. 3. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 4. Remove the pressure control solenoid retainer. 5. Remove the pressure control solenoid. 6. Remove the 1-2 and 2-3 shift solenoid retainers. 7. Remove the 1-2 and 2-3 shift solenoids. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 9588 8. Remove the 3-2 control solenoid retainer. 9. Remove the 3-2 control solenoid. Installation Procedure 1. Install the 3-2 control solenoid. 2. Install the 3-2 control solenoid retainer. 3. Install the 1-2 and 2-3 shift solenoids. 4. Install the 1-2 and 2-3 shift solenoid retainers. 5. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 9589 Notice: Refer to Fastener Notice in Service Precautions. 6. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 7. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 8. Install the 1-2 accumulator. 9. Install the transmission oil pan and filter. 10. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 11. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Locations Torque Converter Clutch Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Torque Converter Clutch Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9595 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9596 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9597 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9598 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9599 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9600 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9601 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9602 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9603 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9604 Torque Converter Clutch Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9605 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9606 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9607 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9608 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9609 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9610 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9611 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9612 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9613 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9614 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9615 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9616 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9617 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9618 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9619 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9620 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9621 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9622 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9623 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9624 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9625 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9626 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9627 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9628 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9629 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9630 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9631 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9632 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9633 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9634 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9635 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9636 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9637 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9638 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9639 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9640 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9641 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9642 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9643 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9644 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9645 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9646 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9647 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9648 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9649 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9650 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9651 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9652 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9653 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9654 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9655 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9656 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9657 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9658 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9659 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9660 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9661 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9662 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9663 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9664 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9665 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9666 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9667 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9668 Torque Converter Clutch Solenoid: Connector Views Automatic Transmission Inline 20-Way Connector End View Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9669 Torque Converter Clutch (TCC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9670 Torque Converter Clutch Solenoid: Service and Repair Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness Tools Required ^ J28458 Seal Protector Retainer Installer Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and the filter. 3. Disconnect the transmission harness 20-way connector from the transmission internal harness pass-through connector. Depress both tabs on the connector and pull straight up; do not pry the connector. 4. Remove the 1-2 accumulator assembly. Do not remove the spacer plate. Important: Removal of the valve body is not necessary for the following procedure. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9671 6. Remove the TCC PWM solenoid retainer. 7. Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts. 8. Remove the pressure control solenoid retainer. 9. Remove the pressure control solenoid. 10. Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness. 11. Using J28458, release the pass-through electrical connector from the transmission case. 1. Use the small end of the J28458 over the top of the connector. 2. Twist in order to release the four tabs retaining the connector. 3. Pull the harness connector down through the transmission case. 12. Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9672 13. Inspect the TCC solenoid and wiring harness assembly for the following defects: ^ Damage ^ Cracked connectors ^ Exposed wires ^ Loose pins Installation Procedure 1. Install the wiring harness and TCC solenoid assembly with a new O-ring seal to the transmission. 2. Install the pass-through electrical connector to the transmission case. 3. Install the valve body bolts which retain the internal wiring harness and install the TCC solenoid retaining bolts. ^ Tighten the control valve body retaining bolts to 11 Nm (97 inch lbs.). ^ Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9673 4. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. 5. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 6. Install the TCC PWM solenoid to the control valve body. 7. Install the TCC PWM solenoid retainer. 8. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 9. Install the 1-2 accumulator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9674 10. Connect the transmission harness 20-way connector to the transmission pass-through connector. Align the arrows on each half of the connector and insert straight down. 11. Install the transmission oil pan and filter. 12. Lower the vehicle. 13. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 14. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Lamps and Indicators Transmission and Drivetrain > Lamps and Indicators - A/T > Shift Indicator > Component Information > Description and Operation Shift Indicator: Description and Operation PRND321 DISPLAY The instrument panel cluster (IPC) displays the selected gear position as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the gear position. The PRND321 display blanks if: - The PCM detects a malfunction in the transmission range switch circuit. - The IPC detects a loss of class 2 communications with the PCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Engine, A/T Controls - Shared Diagnostic Trouble Codes Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9686 Control Module: Locations Automatic Transmission Electronic Component Views Transmission Control Module (TCM) 1 - Engine Harness 2 - Transmission Control Module (TCM) 3 - Transmission Control Module (TCM) Connector Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9687 Control Module: Diagrams Automatic Transmission Related Connector End Views Transmission Control Module (TCM), Engine Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9688 Transmission Control Module (TCM), Engine Side (5.3L and 6.0L) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9689 Control Module: Service and Repair Transmission Control Module (TCM) Replacement Service of the transmission control module (TCM) should consist of reprogramming of the TCM. If the diagnostic procedures call for the TCM to be replaced, the replacement TCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty TCM and install the new service TCM. The replacement TCM must be programmed. Removal Procedure 1. Disconnect the negative battery cable. 2. Disconnect the cooling fan electrical connector for additional clearance while removing the TCM. 3. Depress the engine control module (ECM)/TCM cover retainers (2). 4. Remove the ECM/TCM cover from the ECM/TCM bracket (1). 5. Disconnect the TCM electrical connector (1) from the TCM (2) Notice: Refer to Handling ESD Sensitive Parts Notice. Important: It is not necessary to disconnect the TCM electrical connectors in order to remove the TCM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. Important: Remove any debris from around the TCM connector surfaces before servicing the TCM. Inspect the TCM module connector gaskets when diagnosing or replacing the TCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the TCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9690 6. Release the bracket TCM retainer (1). 7. Tilt the TCM (2) away from the ECM/TCM bracket. 8. Remove the TCM (1) from the TCM bracket (2). 9. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the ECM (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9691 10. Remove the ECM/TCM bracket retaining bolts (2). 11. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. Tighten the bolts to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9692 4. If the ECM was previously removed from the ECM/TCM bracket (2), install the ECM (3). 5. Insert the TCM (1) into the retaining slot of the ECM/TCM bracket (2). 6. Secure the TCM (2) to the ECM/TCM mounting bracket ensuring the TCM retaining tab (1) is fully engaged. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 9693 7. Connect the ECM electrical connector (1) to the TCM (2) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. 12. If the TCM was replaced the replacement TCM must be programmed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications TFP Manual Valve Position Switch Logic Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9699 Fluid Pressure Sensor/Switch: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9700 Fluid Pressure Sensor/Switch: Diagrams Automatic Transmission Inline 20-Way Connector End View Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9701 Fluid Pressure Sensor/Switch: Service and Repair Valve Body and Pressure Switch Replacement Removal Procedure 1. Ensure that removal of the valve body is necessary before proceeding. ^ Important: The following components can be serviced without removing the valve body from the transmission: The torque converter clutch solenoid (1) ^ The pressure control solenoid (2) ^ The internal wiring harness (3) ^ The 2-3 shift solenoid (4) ^ The 1-2 shift solenoid (5) ^ The transmission fluid pressure manual valve position switch (6) ^ The 3-2 shift solenoid (7) ^ The torque converter clutch pulse width modulation (TCC PWM) solenoid (8) 2. Remove the fluid level indicator. 3. Raise the vehicle. 4. Remove the oil pan, gasket, and filter. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9702 6. Remove the fluid indicator stop bracket bolt (2). 7. Remove the fluid indicator bracket (1). 8. Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible. 9. Remove the TCC PWM solenoid (1) in order to access the TCC solenoid retaining bolts. 10. Remove the TCC solenoid retaining bolts. 11. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body. 12. Reposition the harness to the side of the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9703 13. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. 14. Remove the transmission fluid pressure switch. 15. Inspect the transmission fluid pressure switch for damage or debris. 16. Remove the manual detent spring retaining bolt. 17. Remove the manual detent spring. 18. Inspect the manual detent spring for cracks or damage. 19. Remove the remaining control valve body bolts. Important: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9704 20. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. Installation Procedure Ball Check Valves 1. Install the checkballs (1-7) in the valve body. 2. Install the control valve body to the transmission case while simultaneously connecting the manual valve link to the manual valve. 3. Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2). 4. Install one bolt (M6 X 1.0 X 47.5) hand tight in the center (1) of the valve body to hold it in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9705 5. Do not install the transmission fluid indicator stop bracket and bolt at this time. Install but do not tighten the control valve body bolts which retain only the valve body directly. Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following: ^ M6 X 1.0 X 65.0 (1) ^ M6 X 1.0 X 54.4 (2) ^ M6 X 1.0 X 47.5 (3) ^ M6 X 1.0 X 35.0 (4) ^ M8 X 1.0 X 20.0 (5) ^ M6 X 1.0 X 12.0 (6) ^ M6 X 1.0 X 18.0 (7) Important: When installing bolts throughout this procedure, be sure to use the correct bolt size and length in the correct location as specified. 6. Install the manual detent spring. 7. Install but do not tighten the manual detent spring retaining bolt. 8. Install the transmission fluid pressure switch. 9. Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9706 10. Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows. Tighten the control valve body bolts (in sequence) to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation. 11. Ensure that the manual detent spring is aligned properly with the detent lever. Tighten the manual detent spring bolt to 31 Nm (23 ft. lbs.). 12. Install the TCC solenoid with a new O-ring seal to the valve body. 13. Install the TCC solenoid bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9707 Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). 14. Install the internal wiring harness to the valve body. The internal wiring harness has a tab (1) on the edge of the conduit. 15. Place the tab between the valve body and the pressure switch in the location shown (2). Press the harness into position on the valve body bolt bosses (1, 3). 16. Install the TCC PWM solenoid (1) to the control valve body. 17. Install the TCC PWM solenoid retainer (2). 18. Install the transmission fluid indicator stop bracket (1) and bolt (2). Tighten the transmission fluid indicator stop bracket bolt to 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 9708 19. Connect the internal wiring harness electrical connectors to the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) 20. Install the transmission oil pan and filter. 21. Lower the vehicle. 22. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 23. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 9712 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 9713 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 9714 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 9715 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations Transmission Speed Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 9719 Vehicle Speed Sensor (VSS) 1 - VSS Sensor 2 - Transfer Case Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 9720 Transmission Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Input Speed Sensor (ISS) Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Temperature Sensor/Switch, A/T > Component Information > Specifications Transmission Fluid Temperature (TFT) Sensor Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > Customer Interest: > 07-08-49-006 > May > 07 > Brakes - StabiliTrak(R) Light On/DTC C0244 PROM - Programmable Read Only Memory: Customer Interest Brakes - StabiliTrak(R) Light On/DTC C0244 Bulletin No.: 07-08-49-006 Date: May 07, 2007 TECHNICAL Subject: Intermittent StabiliTrak(R) Service/Indicator Light On, Service StabiliTrak(R) Message Displayed, EBCM DTC C0244 Set (Reprogram Engine Control Module (ECM)) Models: 2006 Chevrolet TrailBlazer SS with 6.0L Engine (VIN H - RPO LS2) Condition Some customers may comment on an intermittent StabiliTrak(R) light being illuminated or a Service StabiliTrak(R) message displayed. Upon investigation, the technician may find EBCM DTC C0244 set in history. This condition may be induced during wide open throttle acceleration from a stop or when accelerating onto an express way during low ambient temperatures. Cause This condition may be caused by the ECM sending out an invalid torque request signal. Correction A new calibration has been released to correct this condition. Reprogram the ECM using SPS. This new service calibration is available on TIS2WEB. Be sure to select the correct calibration part number with the description that states - to prevent C0244 at low ambient temperatures. Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026C > Aug > 10 > Engine/Transmission - Aftermarket Calibrations PROM - Programmable Read Only Memory: All Technical Service Bulletins Engine/Transmission Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026C Date: August 13, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2011 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to the latest version of Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine , transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026C > Aug > 10 > Engine/Transmission - Aftermarket Calibrations > Page 9737 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. Note All pictures must be sent as a.jpg file. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026C > Aug > 10 > Engine/Transmission - Aftermarket Calibrations > Page 9738 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026C > Aug > 10 > Engine/Transmission - Aftermarket Calibrations > Page 9739 Note All pictures must be sent as a.jpg file. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026B > Apr > 10 > Engine/Transmission - Aftermarket Calibrations PROM - Programmable Read Only Memory: All Technical Service Bulletins Engine/Transmission Aftermarket Calibrations INFORMATION Bulletin No.: 09-06-04-026B Date: April 07, 2010 Subject: Identifying Non-GM (Aftermarket) Engine and Transmission Calibrations for V8 Gas Engines Using Tech 2(R) or Global Diagnostic System (GDS) Models: 2006-2010 GM Passenger Cars and Light Duty Trucks (Excluding Saab 9-7X) 2006-2009 HUMMER H2 2006-2010 HUMMER H3 Equipped with V8 Gas Powered Engines Only Attention: This bulletin applies to V8 gas powered engines ONLY. For Duramax(TM) diesel powered engines, refer to Corporate Bulletin Number 08-06-04-006G. Supercede: This bulletin is being revised to add the 2010 model year and information about retrieving calibrations on a Global A vehicle. Please discard Corporate Bulletin Number 09-06-04-026A (Section 06 - Engine/Propulsion System). General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non-GM (aftermarket) engine and transmission control calibrations being used. When alteration to the GM-released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy that prevents any UNAUTHORIZED dealer warranty claim submissions to any remaining warranty coverage, to the powertrain and driveline components whenever the presence of a non-GM (aftermarket) calibration is confirmed - even if the non-GM control module calibration is subsequently removed. Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that is essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different from those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life. Additionally, non-GM (aftermarket) issued engine control modifications often do not meet the same emissions performance standards as GM issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and/or penalties. This bulletin outlines a procedure to identify the presence of non-GM (aftermarket) calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated. The PQC has a process to confirm the ECM/PCM calibration is GM issued. The PQC will require a picture of the engine calibration verification screen, as outlined in this bulletin, before authorizing any V8 gas powered engine replacement. If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty will be blocked and notated in GMVIS and the dealership will be notified. This block prevents any UNAUTHORIZED warranty claim submission. 1. Connect the Tech 2(R) to the vehicle. 2. Go to: Diagnostics and build the vehicle. 3. Select: Powertrain. 4. Select: Engine. 5. *Select: Engine Control Module or PCM. 6. *Select: Module ID Information or I/M Information System if the Module ID Information selection is not available. 7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information. ‹› If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026B > Apr > 10 > Engine/Transmission - Aftermarket Calibrations > Page 9744 8. Take a CLEAR digital picture of the Tech 2(R) Vehicle Information screen showing the engine Calibration IDs and Verification Numbers as shown above. Retain the printout information and the Tech 2(R) screen photograph with the repair order. 9. E-mail a copy of the picture to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 10. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 11. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Tech 2(R) Displaying All Zeroes for the Verification Numbers on the Calibration ID and Verification Number Screen If the Tech 2(R) that you are using displays all zeroes for the Verification Numbers as shown, then perform the following steps: 1. Update the Tech 2(R) with the latest software from TIS2WEB. 2. Turn OFF the ignition for 90 seconds. 3. Connect the Tech 2(R) to the vehicle. 4. Turn ON the ignition, and build the vehicle. Observe the Tech 2(R) Calibration ID and Verification Number screen for proper operation. ‹› If the Tech 2(R) screen still does not display properly, then turn OFF the ignition for 90 seconds again. Turn ON the ignition and observe the same screen for proper operation. Retrieving Calibrations From a Global A Vehicle This information applies to the 2010 Camaro and is typical of the procedure that will be used on Global A vehicles. 1. Turn OFF the ignition. 2. Connect the MDI to the Data Link Connector (DLC) of the vehicle. Note Use the USB port to make the following MDI connection: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026B > Apr > 10 > Engine/Transmission - Aftermarket Calibrations > Page 9745 3. Connect the MDI to a PC or laptop that has been downloaded with the GDS application from TIS2WEB. Note At least one Diagnostic Package must be installed on the PC to perform diagnostics. If GDS was just installed, select: Add New Diagnostic Package and then select: a Diagnostic Package to download. 4. Click: On the GDS icon on the PC. 5. The Login Page will appear. 6. Select: A User. 7. The ID Screen will appear. 8. Select: The serial number of the MDI being used. 9. Select: Connect. 10. Verify that the system status is ready by observing for a flashing PC light icon on the MDI. 11. Select: Make, Model and Model Year, in order to build the vehicle. 12. Click: Upload VIN, to allow the VIN to be reported to the PC. 13. At: The Verification step, turn ON the ignition, with the engine OFF. 14. Select: Next Action. 15. The Home Page will appear. 16. Select: Next. 17. The Diagnostic Screen will appear. Note Due to vehicle build, software and RPO variations, GDS may ask for additional information in Step 18. 18. Select: Engine ID, if prompted. 19. Select: Module Diagnostics. 20. Select: ECM. 21. Select: ID Information. 22. The Diagnostics page will appear. Typical View of GDS Calibration History Screen Note GDS is capable of displaying up to 10 Calibration History events. 23. Select: Calibration History from the drop down menu in order to display the following items on the screen: - Calibration History Buffer - Number of Calibration History Events Stored - Calibration Part Number History - Calibration Verification Number History 24. Select: Screenshot. 25. Name and save the file in an appropriate folder. 26. Select : Print, and retain a copy of the screenshot with the repair order. 27. E-mail a copy of the screenshot to [email protected]. In the subject line of the e-mail include the phrase "V8 Cal" as well as the complete VIN and Dealer BAC. In the body of the e-mail, include the VIN, mileage, R.O. number and BAC. Include a brief description of the customer concern and cause of the concern. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 09-06-04-026B > Apr > 10 > Engine/Transmission - Aftermarket Calibrations > Page 9746 Note The dealer will receive an e-mail reply after the calibrations have been validated. The e-mail reply will advise the dealer if the calibrations are OEM. 28. Allow two hours for the PQC to verify the calibrations and set up the case details. ‹› If the PQC determines that the calibrations ARE aftermarket calibrations, DO NOT contact GM Technical Assistance to discuss warranty concerns on the aftermarket calibrations. ALL questions and concerns about warranty should be directed to the dealers Fixed Operations Manager (FOM), (Warranty Manager (WM) in Canada). 29. You may call the PQC two hours after submitting the e-mail for authorization to replace the assembly. This will provide them time to receive, review and set up a case on the request. Please be prepared to provide all the usual documentation that is normally required when requesting an assembly authorization from the PQC. Warranty Information - The Dealership Service Management must be involved in any situation that would justify the use of labor operation Z1111. - Notify the Fixed Operations Manager (FOM) (Warranty Manager (WM) in Canada) of the situation. - All claims will have to be routed to the FOM (WM in Canada) for approval. - Please refer to Corporate Bulletin Number 09-00-89-016, Labor Operation Z1111 - Suspected Tampering or Vehicle Modifications for important information. For vehicles repaired under warranty, use the table above. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 07-08-49-006 > May > 07 > Brakes StabiliTrak(R) Light On/DTC C0244 PROM - Programmable Read Only Memory: All Technical Service Bulletins Brakes - StabiliTrak(R) Light On/DTC C0244 Bulletin No.: 07-08-49-006 Date: May 07, 2007 TECHNICAL Subject: Intermittent StabiliTrak(R) Service/Indicator Light On, Service StabiliTrak(R) Message Displayed, EBCM DTC C0244 Set (Reprogram Engine Control Module (ECM)) Models: 2006 Chevrolet TrailBlazer SS with 6.0L Engine (VIN H - RPO LS2) Condition Some customers may comment on an intermittent StabiliTrak(R) light being illuminated or a Service StabiliTrak(R) message displayed. Upon investigation, the technician may find EBCM DTC C0244 set in history. This condition may be induced during wide open throttle acceleration from a stop or when accelerating onto an express way during low ambient temperatures. Cause This condition may be caused by the ECM sending out an invalid torque request signal. Correction A new calibration has been released to correct this condition. Reprogram the ECM using SPS. This new service calibration is available on TIS2WEB. Be sure to select the correct calibration part number with the description that states - to prevent C0244 at low ambient temperatures. Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Other Service Bulletins for PROM - Programmable Read Only Memory: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad Horn Switch: All Technical Service Bulletins Horn - Inoperative When Pressing Horn Pad TECHNICAL Bulletin No.: 07-08-54-001C Date: October 17, 2008 Subject: EI07279 - Horn Inoperative from Steering Wheel Horn Pad (Ground Path Repair Procedure) Models: 2006-2007 Buick Rainier 2006 Chevrolet TrailBlazer EXT 2006-2009 Chevrolet TrailBlazer 2006 GMC Envoy XL, Envoy XUV 2006-2009 GMC Envoy, Envoy Denali Supercede: This bulletin is being revised to provide field fix information. Please discard Corporate Bulletin Number 07-08-54-001B (Section 08 - Body and Accessories). Condition Important: If the horn does NOT work from the key fob horn button, disregard this bulletin and proceed with diagnosis/repair according to SI. Some customers may comment that the horn is inoperative from the horn pad on the steering wheel. Cause The general cause of this condition is high resistance in the ground path through the steering column that energizes the horn relay. The key fob panic button uses a different ground path and is not affected. A number of locations in the circuit have been identified as sources of the high resistance. It is often difficult to pinpoint the specific location of the high resistance because the condition is usually intermittent. Attempting to discover the location can be frustrating because as circuit components are moved, the condition will often disappear. A few locations have been identified as frequent contributors to the problem. Correction Complete the following steps to diagnose and repair this condition: 1. Does the horn work by depressing the button(s) on the key fob? ^ Yes - proceed with step 2. ^ No - do not proceed with this bulletin. Diagnose and repair using information found in SI. 2. To aid in the diagnosis and to avoid disturbing others, disconnect the wiring harness from the horn assembly and insert appropriate connectors to monitor the voltage with a multi-meter or a test light. If the horn pad is currently working, rotate the steering wheel lock to lock while depressing the horn pad to determine if there are any spots in the rotation where the horn pad quits working. Caution: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling. Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Other Service Bulletins for PROM - Programmable Read Only Memory: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 9756 repairs. 3. Remove the Inflatable Restraint Steering Wheel Module using the procedure found in Service Information. Remove the horn contacts from the steering wheel. Clean the brass contact on the end of the red wires with an abrasive pad. If possible, remove any contamination present on the mating contact on the cancel cam (inside the black tube). Also clean the four copper rivets embedded in the steering wheel frame. Apply GM Dielectric Lubricant to all the contacts to protect against reoccurrence of the corrosion. Refer to the graphic. 4. Reinstall the horn contacts and the Inflatable Restraint Steering Wheel Module and test for proper operation of the horn pad. Test for proper operation of the horn pad through the entire steering wheel rotation. Does the horn pad work properly? ^ Yes - repair is complete. ^ No - proceed with step 5. 5. Is the inoperative condition only present at certain steering wheel positions? ^ Yes - proceed with step 6. ^ No - proceed with step 9. 6. Remove the steering column trim covers. Position the steering wheel on a dead spot. Ground a test light to the steering column frame close to the steering wheel. Probe the surface of the turn signal cancel cam with the test light. Does grounding the cam activate the horn? ^ Yes - this may mean that the contact of the cancel cam that mates to the horn contact wiring harness contact, may not be clean enough or that the cancel cam may need to be replaced. Repair as necessary. Procedure complete. ^ No - proceed with step 7.Turn Signal Cancel Cam: 7. Disconnect the wiring harness that goes to the top of the multi-function switch (connector X1). Using the grounded test light, touch the harness connection for pin G. Does grounding the pin activate the horn? ^ Yes - proceed with step 8. ^ No - try grounding the test light on a known good ground. If this activates the horn, proceed to step 9. If not, investigate a possible condition with the wiring harness or BCM with appropriate SI documents. 8. The condition lies either in the multi-function switch or the interface between the multi-function switch and the cancel cam. In some cases, removing the multi-function switch and clearing the horn contact that mates with the cancel cam (refer to the graphic) of debris and reinstalling the switch will eliminate the condition. In other cases, the cancel cam may be losing contact with the multi-function switch contact. If distortion in the cancel cam is present, it may be necessary to replace the cancel cam. Repair as necessary. Procedure complete. 9. Remove the left side IP insulator (refer to Instrument Panel Insulator Panel Replacement found in SI) so it can be moved aside enough to see the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Other Service Bulletins for PROM - Programmable Read Only Memory: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 9757 steering column. 10. Depress the horn contacts in the steering wheel. Does the horn work? ^ Yes - Check if the operation of the horn is sensitive to pressure applied to the steering wheel as if a driver were doing a panic stop. In some cases, pressure applied to the steering wheel in different directions will expose a bad ground path in the steering column. Proceed to step 11. ^ No - proceed with step 11. 11. Inspect the steering column through the insulator panel location. Note: The shaft from the steering wheel comes through a metal bracket. That bracket is surrounded by plastic, which is inside of another metal bracket. Look for a small metal clip (refer to the "horn clip" graphic) that connects the inner bracket (inside the plastic) and the outer bracket. This clip provides an auxiliary ground path which is needed in some cases, if the primary path has a bad connection. 12. To verify this, connect a test light between the red wire on the horn contacts in the steering wheel and the steering column sections (1) and (2) in the illustration. Does the horn work when grounded to (1) and not (2)? ^ Yes - add or replace the horn clip. ^ No - refer to the Horn Inoperative section in SI to diagnose which component in the circuit is causing the horn inoperative condition. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Other Service Bulletins for PROM - Programmable Read Only Memory: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 9763 repairs. 3. Remove the Inflatable Restraint Steering Wheel Module using the procedure found in Service Information. Remove the horn contacts from the steering wheel. Clean the brass contact on the end of the red wires with an abrasive pad. If possible, remove any contamination present on the mating contact on the cancel cam (inside the black tube). Also clean the four copper rivets embedded in the steering wheel frame. Apply GM Dielectric Lubricant to all the contacts to protect against reoccurrence of the corrosion. Refer to the graphic. 4. Reinstall the horn contacts and the Inflatable Restraint Steering Wheel Module and test for proper operation of the horn pad. Test for proper operation of the horn pad through the entire steering wheel rotation. Does the horn pad work properly? ^ Yes - repair is complete. ^ No - proceed with step 5. 5. Is the inoperative condition only present at certain steering wheel positions? ^ Yes - proceed with step 6. ^ No - proceed with step 9. 6. Remove the steering column trim covers. Position the steering wheel on a dead spot. Ground a test light to the steering column frame close to the steering wheel. Probe the surface of the turn signal cancel cam with the test light. Does grounding the cam activate the horn? ^ Yes - this may mean that the contact of the cancel cam that mates to the horn contact wiring harness contact, may not be clean enough or that the cancel cam may need to be replaced. Repair as necessary. Procedure complete. ^ No - proceed with step 7.Turn Signal Cancel Cam: 7. Disconnect the wiring harness that goes to the top of the multi-function switch (connector X1). Using the grounded test light, touch the harness connection for pin G. Does grounding the pin activate the horn? ^ Yes - proceed with step 8. ^ No - try grounding the test light on a known good ground. If this activates the horn, proceed to step 9. If not, investigate a possible condition with the wiring harness or BCM with appropriate SI documents. 8. The condition lies either in the multi-function switch or the interface between the multi-function switch and the cancel cam. In some cases, removing the multi-function switch and clearing the horn contact that mates with the cancel cam (refer to the graphic) of debris and reinstalling the switch will eliminate the condition. In other cases, the cancel cam may be losing contact with the multi-function switch contact. If distortion in the cancel cam is present, it may be necessary to replace the cancel cam. Repair as necessary. Procedure complete. 9. Remove the left side IP insulator (refer to Instrument Panel Insulator Panel Replacement found in SI) so it can be moved aside enough to see the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Powertrain Management > PROM - Programmable Read Only Memory > Component Information > Technical Service Bulletins > All Other Service Bulletins for PROM - Programmable Read Only Memory: > 07-08-54-001C > Oct > 08 > Horn - Inoperative When Pressing Horn Pad > Page 9764 steering column. 10. Depress the horn contacts in the steering wheel. Does the horn work? ^ Yes - Check if the operation of the horn is sensitive to pressure applied to the steering wheel as if a driver were doing a panic stop. In some cases, pressure applied to the steering wheel in different directions will expose a bad ground path in the steering column. Proceed to step 11. ^ No - proceed with step 11. 11. Inspect the steering column through the insulator panel location. Note: The shaft from the steering wheel comes through a metal bracket. That bracket is surrounded by plastic, which is inside of another metal bracket. Look for a small metal clip (refer to the "horn clip" graphic) that connects the inner bracket (inside the plastic) and the outer bracket. This clip provides an auxiliary ground path which is needed in some cases, if the primary path has a bad connection. 12. To verify this, connect a test light between the red wire on the horn contacts in the steering wheel and the steering column sections (1) and (2) in the illustration. Does the horn work when grounded to (1) and not (2)? ^ Yes - add or replace the horn clip. ^ No - refer to the Horn Inoperative section in SI to diagnose which component in the circuit is causing the horn inoperative condition. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams Pressure Regulating Solenoid: Diagrams Automatic Transmission Inline 20-Way Connector End View Pressure Control (PC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 9771 Pressure Regulating Solenoid: Service and Repair Pressure Regulator Replacement Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and filter. 3. Compress the reverse boost valve sleeve into the bore of the oil pump to release tension on the reverse boost valve retaining ring. 4. Remove the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 5. Remove the reverse boost valve sleeve (5) and the reverse boost valve (4). 6. Remove the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 7. Remove the pressure regulator valve (1). Installation Procedure 1. Install the pressure regulator valve (1). 2. Install the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 3. Install the reverse boost valve (4) in the reverse boost valve sleeve (5). 4. Install the reverse boost valve (4) and sleeve (5) in the oil pump cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 9772 5. Compress the reverse boost valve sleeve into the bore of the oil pump to expose the retaining ring slot. 6. Install the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 7. Install the transmission oil filter and pan. 8. Lower the vehicle. 9. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 10. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Automatic Transmission/Transaxle/Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T Shift Lock Control Actuator Available Shift Interlock Solenoid: Technical Service Bulletins A/T - Shift Lock Control Actuator Available Bulletin No.: 05-07-129-001B Date: February 16, 2007 INFORMATION Subject: Automatic Transmission Shift Lock Control Actuator Available for Service Use Models: 2004-2007 Buick Rainier 2002-2007 Chevrolet TrailBlazer 2002-2006 Chevrolet TrailBlazer EXT 2003-2006 Chevrolet SSR 2002-2007 GMC Envoy 2002-2006 GMC Envoy XL 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada 2003-2007 HUMMER H2 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to update the model years and add the SSR. Please discard Corporate Bulletin Number 05-07-129-001A (Section 07 - Transmission/Transaxle). The automatic transmission shift lock control actuator is now available for service as a separate part. The actuator was formerly available only as part of the entire shifter assembly. DO NOT replace the shifter assembly if the shift lock control actuator requires replacement. Please refer to the Automatic Transmission Shift Lock Control Actuator Replacement procedure in the Automatic Transmission sub-section of the Service Information. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T Shift Lock Control Actuator Available > Page 9777 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9778 Shift Interlock Solenoid: Locations Shift Lock Control Component Views Automatic Transmission Shift Lock Actuator 1 - Lower Console 2 - Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9779 Shift Interlock Solenoid: Diagrams Shift Lock Control Connector End Views Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9780 Shift Interlock Solenoid: Service and Repair Automatic Transmission Shift Lock Actuator Replacement Important: After assembling the shift lock actuator, turn the ignition forward but do not start (auxiliary position) and attempt to pull the lever from PARK with and without the brake pedal depressed to verify there is no gear access without the brake pedal depressed. Important: Ensure the key cannot be removed from the ignition unless both the shiftier is in PARK and the shift knob button has been depressed. Removal Procedure 1. Remove the console. 2. Disconnect the shift lock actuator (3) electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9781 3. Shift assembly to the LOW position. 4. Loosen and remove the screw at the rear of the shiftier assembly. 5. Shift the assembly to the NEUTRAL position. 6. Loosen and remove the top screw of the shift lock actuator through the lever slot. 7. Pull lever to the DRIVE position and remove the shift lock actuator. Installation Procedure 1. In DRIVE position, depress the shift lock actuator button and realign into the shiftier lever. 2. Push lever to NEUTRAL. 3. Install the top screw through the lever slot. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Shift lever to LOW. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9782 5. Install the screw at the rear of the shiftier assembly. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). 6. Connect the electrical connector (3). 7. Verify the shift lock actuator functions properly. 8. Install the console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications Shift Solenoid Valve State and Gear Ratio Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications > Page 9786 Shift Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Shift Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9789 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9790 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9791 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9792 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9793 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9794 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9795 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9796 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9797 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9798 Shift Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9799 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9800 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9801 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9802 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9803 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9804 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9805 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9806 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9807 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9808 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9809 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9810 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9811 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9812 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9813 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9814 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9815 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9816 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9817 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9818 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9819 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9820 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9821 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9822 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9823 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9824 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9825 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9826 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9827 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9828 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9829 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9830 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9831 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9832 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9833 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9834 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9835 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9836 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9837 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9838 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9839 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9840 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9841 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9842 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9843 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9844 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9845 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9846 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9847 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9848 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9849 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9850 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9851 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9852 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9853 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9854 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9855 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9856 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9857 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9858 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9859 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9860 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9861 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9862 Shift Solenoid: Connector Views Automatic Transmission Internal Connector End Views 1-2 Shift Solenoid (SS) Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9863 2-3 Shift Solenoid (SS) Valve, Wiring Harness Side 3-2 Shift Solenoid (SS) Valve Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 9864 Shift Solenoid: Service and Repair Control and Shift Solenoids Replacement Removal Procedure 1. Remove the transmission oil pan and filter. 2. Remove the 1-2 accumulator if necessary. Important: Do not remove the valve body for the following procedures. Removal of the 1-2 accumulator is necessary only if servicing the pressure control solenoid. 3. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 4. Remove the pressure control solenoid retainer. 5. Remove the pressure control solenoid. 6. Remove the 1-2 and 2-3 shift solenoid retainers. 7. Remove the 1-2 and 2-3 shift solenoids. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 9865 8. Remove the 3-2 control solenoid retainer. 9. Remove the 3-2 control solenoid. Installation Procedure 1. Install the 3-2 control solenoid. 2. Install the 3-2 control solenoid retainer. 3. Install the 1-2 and 2-3 shift solenoids. 4. Install the 1-2 and 2-3 shift solenoid retainers. 5. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 9866 Notice: Refer to Fastener Notice in Service Precautions. 6. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 7. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 8. Install the 1-2 accumulator. 9. Install the transmission oil pan and filter. 10. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 11. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Automatic Transmission/Transaxle/Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Locations Torque Converter Clutch Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Torque Converter Clutch Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9872 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9873 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9874 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9875 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9876 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9877 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9878 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9879 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9880 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9881 Torque Converter Clutch Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9882 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9883 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9884 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9885 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9886 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9887 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9888 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9889 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9890 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9891 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9892 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9893 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9894 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9895 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9896 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9897 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9898 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9899 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9900 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9901 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9902 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9903 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9904 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9905 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9906 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9907 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9908 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9909 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9910 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9911 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9912 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9913 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9914 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9915 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9916 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9917 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9918 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9919 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9920 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9921 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9922 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9923 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9924 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9925 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9926 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9927 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9928 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9929 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9930 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9931 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9932 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9933 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9934 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9935 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9936 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9937 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9938 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9939 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9940 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9941 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9942 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9943 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9944 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9945 Torque Converter Clutch Solenoid: Connector Views Automatic Transmission Inline 20-Way Connector End View Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9946 Torque Converter Clutch (TCC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9947 Torque Converter Clutch Solenoid: Service and Repair Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness Tools Required ^ J28458 Seal Protector Retainer Installer Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and the filter. 3. Disconnect the transmission harness 20-way connector from the transmission internal harness pass-through connector. Depress both tabs on the connector and pull straight up; do not pry the connector. 4. Remove the 1-2 accumulator assembly. Do not remove the spacer plate. Important: Removal of the valve body is not necessary for the following procedure. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9948 6. Remove the TCC PWM solenoid retainer. 7. Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts. 8. Remove the pressure control solenoid retainer. 9. Remove the pressure control solenoid. 10. Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness. 11. Using J28458, release the pass-through electrical connector from the transmission case. 1. Use the small end of the J28458 over the top of the connector. 2. Twist in order to release the four tabs retaining the connector. 3. Pull the harness connector down through the transmission case. 12. Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9949 13. Inspect the TCC solenoid and wiring harness assembly for the following defects: ^ Damage ^ Cracked connectors ^ Exposed wires ^ Loose pins Installation Procedure 1. Install the wiring harness and TCC solenoid assembly with a new O-ring seal to the transmission. 2. Install the pass-through electrical connector to the transmission case. 3. Install the valve body bolts which retain the internal wiring harness and install the TCC solenoid retaining bolts. ^ Tighten the control valve body retaining bolts to 11 Nm (97 inch lbs.). ^ Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9950 4. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. 5. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 6. Install the TCC PWM solenoid to the control valve body. 7. Install the TCC PWM solenoid retainer. 8. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 9. Install the 1-2 accumulator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Actuators and Solenoids - Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 9951 10. Connect the transmission harness 20-way connector to the transmission pass-through connector. Align the arrows on each half of the connector and insert straight down. 11. Install the transmission oil pan and filter. 12. Lower the vehicle. 13. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 14. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams Pressure Regulating Solenoid: Diagrams Automatic Transmission Inline 20-Way Connector End View Pressure Control (PC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 9957 Pressure Regulating Solenoid: Service and Repair Pressure Regulator Replacement Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and filter. 3. Compress the reverse boost valve sleeve into the bore of the oil pump to release tension on the reverse boost valve retaining ring. 4. Remove the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 5. Remove the reverse boost valve sleeve (5) and the reverse boost valve (4). 6. Remove the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 7. Remove the pressure regulator valve (1). Installation Procedure 1. Install the pressure regulator valve (1). 2. Install the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 3. Install the reverse boost valve (4) in the reverse boost valve sleeve (5). 4. Install the reverse boost valve (4) and sleeve (5) in the oil pump cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 9958 5. Compress the reverse boost valve sleeve into the bore of the oil pump to expose the retaining ring slot. 6. Install the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 7. Install the transmission oil filter and pan. 8. Lower the vehicle. 9. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 10. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available Shift Interlock Solenoid: Technical Service Bulletins A/T - Shift Lock Control Actuator Available Bulletin No.: 05-07-129-001B Date: February 16, 2007 INFORMATION Subject: Automatic Transmission Shift Lock Control Actuator Available for Service Use Models: 2004-2007 Buick Rainier 2002-2007 Chevrolet TrailBlazer 2002-2006 Chevrolet TrailBlazer EXT 2003-2006 Chevrolet SSR 2002-2007 GMC Envoy 2002-2006 GMC Envoy XL 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada 2003-2007 HUMMER H2 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to update the model years and add the SSR. Please discard Corporate Bulletin Number 05-07-129-001A (Section 07 - Transmission/Transaxle). The automatic transmission shift lock control actuator is now available for service as a separate part. The actuator was formerly available only as part of the entire shifter assembly. DO NOT replace the shifter assembly if the shift lock control actuator requires replacement. Please refer to the Automatic Transmission Shift Lock Control Actuator Replacement procedure in the Automatic Transmission sub-section of the Service Information. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available > Page 9963 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9964 Shift Interlock Solenoid: Locations Shift Lock Control Component Views Automatic Transmission Shift Lock Actuator 1 - Lower Console 2 - Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9965 Shift Interlock Solenoid: Diagrams Shift Lock Control Connector End Views Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9966 Shift Interlock Solenoid: Service and Repair Automatic Transmission Shift Lock Actuator Replacement Important: After assembling the shift lock actuator, turn the ignition forward but do not start (auxiliary position) and attempt to pull the lever from PARK with and without the brake pedal depressed to verify there is no gear access without the brake pedal depressed. Important: Ensure the key cannot be removed from the ignition unless both the shiftier is in PARK and the shift knob button has been depressed. Removal Procedure 1. Remove the console. 2. Disconnect the shift lock actuator (3) electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9967 3. Shift assembly to the LOW position. 4. Loosen and remove the screw at the rear of the shiftier assembly. 5. Shift the assembly to the NEUTRAL position. 6. Loosen and remove the top screw of the shift lock actuator through the lever slot. 7. Pull lever to the DRIVE position and remove the shift lock actuator. Installation Procedure 1. In DRIVE position, depress the shift lock actuator button and realign into the shiftier lever. 2. Push lever to NEUTRAL. 3. Install the top screw through the lever slot. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Shift lever to LOW. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 9968 5. Install the screw at the rear of the shiftier assembly. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). 6. Connect the electrical connector (3). 7. Verify the shift lock actuator functions properly. 8. Install the console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications Shift Solenoid Valve State and Gear Ratio Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications > Page 9972 Shift Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Shift Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9975 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9976 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9977 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9978 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9979 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9980 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9981 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9982 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9983 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9984 Shift Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9985 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9986 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9987 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9988 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9989 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9990 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9991 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9992 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9993 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9994 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9995 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9996 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9997 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9998 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 9999 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10000 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10001 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10002 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10003 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10004 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10005 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10006 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10007 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10008 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10009 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10010 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10011 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10012 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10013 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10014 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10015 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10016 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10017 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10018 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10019 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10020 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10021 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10022 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10023 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10024 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10025 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10026 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10027 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10028 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10029 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10030 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10031 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10032 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10033 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10034 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10035 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10036 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10037 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10038 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10039 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10040 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10041 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10042 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10043 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10044 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10045 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10046 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10047 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10048 Shift Solenoid: Connector Views Automatic Transmission Internal Connector End Views 1-2 Shift Solenoid (SS) Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10049 2-3 Shift Solenoid (SS) Valve, Wiring Harness Side 3-2 Shift Solenoid (SS) Valve Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 10050 Shift Solenoid: Service and Repair Control and Shift Solenoids Replacement Removal Procedure 1. Remove the transmission oil pan and filter. 2. Remove the 1-2 accumulator if necessary. Important: Do not remove the valve body for the following procedures. Removal of the 1-2 accumulator is necessary only if servicing the pressure control solenoid. 3. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 4. Remove the pressure control solenoid retainer. 5. Remove the pressure control solenoid. 6. Remove the 1-2 and 2-3 shift solenoid retainers. 7. Remove the 1-2 and 2-3 shift solenoids. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 10051 8. Remove the 3-2 control solenoid retainer. 9. Remove the 3-2 control solenoid. Installation Procedure 1. Install the 3-2 control solenoid. 2. Install the 3-2 control solenoid retainer. 3. Install the 1-2 and 2-3 shift solenoids. 4. Install the 1-2 and 2-3 shift solenoid retainers. 5. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 10052 Notice: Refer to Fastener Notice in Service Precautions. 6. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 7. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 8. Install the 1-2 accumulator. 9. Install the transmission oil pan and filter. 10. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 11. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Locations Torque Converter Clutch Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Torque Converter Clutch Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10058 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10059 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10060 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10061 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10062 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10063 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10064 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10065 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10066 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10067 Torque Converter Clutch Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10068 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10069 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10070 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10071 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10072 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10073 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10074 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10075 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10076 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10077 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10078 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10079 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10080 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10081 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10082 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10083 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10084 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10085 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10086 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10087 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10088 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10089 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10090 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10091 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10092 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10093 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10094 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10095 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10096 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10097 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10098 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10099 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10100 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10101 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10102 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10103 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10104 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10105 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10106 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10107 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10108 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10109 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10110 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10111 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10112 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10113 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10114 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10115 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10116 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10117 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10118 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10119 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10120 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10121 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10122 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10123 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10124 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10125 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10126 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10127 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10128 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10129 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10130 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10131 Torque Converter Clutch Solenoid: Connector Views Automatic Transmission Inline 20-Way Connector End View Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10132 Torque Converter Clutch (TCC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10133 Torque Converter Clutch Solenoid: Service and Repair Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness Tools Required ^ J28458 Seal Protector Retainer Installer Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and the filter. 3. Disconnect the transmission harness 20-way connector from the transmission internal harness pass-through connector. Depress both tabs on the connector and pull straight up; do not pry the connector. 4. Remove the 1-2 accumulator assembly. Do not remove the spacer plate. Important: Removal of the valve body is not necessary for the following procedure. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10134 6. Remove the TCC PWM solenoid retainer. 7. Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts. 8. Remove the pressure control solenoid retainer. 9. Remove the pressure control solenoid. 10. Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness. 11. Using J28458, release the pass-through electrical connector from the transmission case. 1. Use the small end of the J28458 over the top of the connector. 2. Twist in order to release the four tabs retaining the connector. 3. Pull the harness connector down through the transmission case. 12. Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10135 13. Inspect the TCC solenoid and wiring harness assembly for the following defects: ^ Damage ^ Cracked connectors ^ Exposed wires ^ Loose pins Installation Procedure 1. Install the wiring harness and TCC solenoid assembly with a new O-ring seal to the transmission. 2. Install the pass-through electrical connector to the transmission case. 3. Install the valve body bolts which retain the internal wiring harness and install the TCC solenoid retaining bolts. ^ Tighten the control valve body retaining bolts to 11 Nm (97 inch lbs.). ^ Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10136 4. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. 5. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 6. Install the TCC PWM solenoid to the control valve body. 7. Install the TCC PWM solenoid retainer. 8. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 9. Install the 1-2 accumulator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10137 10. Connect the transmission harness 20-way connector to the transmission pass-through connector. Align the arrows on each half of the connector and insert straight down. 11. Install the transmission oil pan and filter. 12. Lower the vehicle. 13. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 14. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis Accumulator: Technical Service Bulletins A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis Bulletin No.: 01-07-30-030B Date: October 18, 2005 INFORMATION Subject: 4L60-E/4L65-E Automatic Transmission Diagnostic Information on Harsh 1-2 Upshift Models: 2001-2006 GM Passenger Cars and Light Duty Trucks 2003-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission Supercede: This bulletin is being revised to add model years and models. Please discard Corporate Bulletin Number 01-07-30-030A (Section 07 - Transmission/Transaxle). The following four conditions have been found to cause the majority of consistent, harsh 1-2 shift comments. ^ Chips/Sediment/Debris/Contamination found in the valve body, 1-2 accumulator valve (371) bore, may cause the 1-2 accumulator valve to stick or hang-up. ^ Chips/Sediment/Debris/Contamination found in the valve body, 4-3 sequence valve (383) bore, may cause the 4-3 sequence valve to stick or hang-up. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10142 A cracked 1-2 accumulator piston (56) that is allowing fluid to leak by. Mislocated/Missing valve body-to-spacer plate check balls (61). When attempting to correct a consistent harsh 1-2 shift, the four conditions listed above should be inspected as possible causes. It is important to also refer to the appropriate Service Manual for further possible causes of this condition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10143 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10144 This diagnostic table should be used when addressing a harsh 1-2 shift concern. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > Page 10145 Accumulator: Service and Repair Accumulator Assembly, Spacer Plate, and Gaskets Tools Required ^ J25025-B Pump and Valve Body Alignment Pin Set ^ J36850 Transjel Lubricant Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and filter. 3. Remove the control valve body. Important: The 1-2 accumulator can be removed without removing the control valve assembly. 4. Remove the accumulator cover retaining bolts. 5. Remove the 1-2 accumulator cover assembly. 6. Disassemble the 1-2 accumulator. 1. Blow compressed air into the 1-2 accumulator cover, as shown, to remove the 1-2 accumulator piston. 2. Remove the 1-2 accumulator inner and outer springs. 7. Inspect the 1-2 accumulator inner and outer springs for cracks. 8. Remove the 1-2 accumulator piston seal (1) from the 1-2 accumulator piston. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > Page 10146 9. Inspect the 1-2 accumulator piston for the following defects: ^ Porosity ^ Cracks ^ Scoring ^ Nicks and scratches 10. Inspect the 1-2 accumulator cover for the following defects: ^ Porosity ^ Cracks ^ Scoring ^ Nicks and scratches 11. Remove the spacer plate support retaining bolts. 12. Remove the spacer plate support. Important: Use care not to drop the following items that will be removed along with the spacer plate: ^ The number 1 checkball ^ The 3-4 accumulator spring ^ The 3-4 accumulator pin 13. Remove the spacer plate to valve body gasket, the spacer plate and the spacer plate to transmission case gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > Page 10147 14. Remove the 3-4 accumulator piston (2). 15. Inspect the 3-4 accumulator spring for cracks. 16. Remove the 3-4 accumulator piston seal (1) from the 3-4 accumulator piston. 17. Inspect the 3-4 accumulator piston for the following defects: ^ Porosity ^ Cracks ^ Scoring ^ Nicks and scratches Installation Procedure 1. Install a new 3-4 accumulator piston seal (1) to the 3-4 accumulator piston. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > Page 10148 2. Install the 3-4 accumulator pin (1) into the transmission case and retain the pin with J36850. 3. Install the 3-4 accumulator piston (2) onto the pin (1) in the transmission case. Ensure that the 3-4 accumulator piston legs face away from the transmission case. 4. Install the J25025-B (2, 3) to the transmission case. 5. Install the spacer plate to transmission case gasket and the spacer plate to valve body gasket to the spacer plate; use J36850 in order to retain the gaskets to the spacer plate. ^ The case gasket is identified by a C. Be sure to place the case gasket on the transmission case side of the spacer plate. ^ The valve body gasket is identified by a V. Be sure to place the valve body gasket on the valve body side of the spacer plate. 6. Ensure that the solenoid screens (1, 2) are in place on the spacer plate. 7. Place the checkball (3) on the spacer plate in the location shown. 8. Place the 3-4 accumulator spring (4) on the spacer plate. 9. Install the spacer plate and related components to the transmission. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > Page 10149 10. Install the spacer plate support and the spacer plate support retaining bolts. Tighten the spacer plate support retaining bolts to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 11. After installing the spacer plate support (2), look through the hole in the spacer plate to ensure that the checkball (1) has remained in the proper location. 12. Install a new 1-2 accumulator piston seal (1) to the 1-2 accumulator piston. 13. Install the 1-2 accumulator inner and outer springs to the 1-2 accumulator cover. 14. Install the 1-2 accumulator piston onto the pin in the 1-2 accumulator cover. Ensure that the piston legs face the accumulator cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Accumulator, A/T > Component Information > Technical Service Bulletins > Page 10150 15. Install the 1-2 accumulator cover and the accumulator cover retaining bolts. Tighten the accumulator cover retaining bolts to 11 Nm (97 inch lbs.). 16. Remove the J25025-B from the transmission case. 17. Install the control valve body. 18. Install the transmission oil pan and filter. 19. Lower the vehicle. 20. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 21. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Band Apply Servo, A/T > Component Information > Service and Repair Band Apply Servo: Service and Repair 2-4 Servo Removal Procedure Tools Required ^ J29714-A Servo Cover Depressor 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Support the transmission with a suitable jack. 3. Remove the transmission support. 4. Remove the front exhaust pipe assembly. 5. Remove the heat shield if equipped. 6. Carefully lower the transmission to gain access to the 2-4 Servo. 7. Install the J29714-A. 8. Tighten the bolt in order to compress the servo cover. 9. Remove the servo cover retaining ring. 10. Remove the J29714-A. 11. Remove the servo cover and the O-ring seal. If the cover is hung up on the seal, use a pick (2) to pull and stretch the seal (1) out of the groove. Cut and remove the O-ring seal before removing the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Band Apply Servo, A/T > Component Information > Service and Repair > Page 10154 12. Remove the 2-4 servo from the transmission. 13. Inspect the 4th apply piston, 2-4 servo converter, 2nd apply piston, and the servo piston inner housing for the following defects. ^ Cracks ^ Scoring ^ Burrs and nicks Installation Procedure 1. Install new seals on the servo pistons and the servo cover. 2. Install the 2-4 servo assembly into the transmission. 3. Install the J29714-A. 4. Tighten the bolt in order to compress the servo cover. 5. Install the servo cover retaining ring. 6. Remove the J29714-A from the oil pan flange. 7. Install the transmission oil pan bolt. Tighten the bolt to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 8. Install the heat shield if equipped. 9. Install the exhaust pipe assembly. 10. Install the transmission support. 11. Remove the transmission jack. 12. Lower the vehicle. 13. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Band Apply Servo, A/T > Component Information > Service and Repair > Page 10155 14. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Case, A/T > Component Information > Technical Service Bulletins > A/T - Cracked Case Diagnosis Case: Technical Service Bulletins A/T - Cracked Case Diagnosis Bulletin No.: 02-07-30-024B Date: August 18, 2005 INFORMATION Subject: Diagnosis of Cracked or Broken Transmission Case Models: 2006 and Prior Cars and Light Duty Trucks 2006 and Prior HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X with 4L60/4L60-E/4L65-E or 4L80-E/4L85-E or Allison(R) Series 1000 Automatic Transmission Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 02-07-30-024A (Section 07 - Transmission/Transaxle). Diagnosing the cause of a cracked or broken transmission case requires additional diagnosis and repair or a repeat failure will occur. A cracked or broken transmission case is most often the result of abnormal external torsional forces acting on the transmission case. If none of the conditions listed below are apparent, an internal transmission component inspection may be required. Repairs of this type may be the result of external damage or abuse for which General Motors is not responsible. They are not the result of defects in materials or workmanship. If in doubt, contact your General Motors Service Representative. The following items should be considered: ^ It is important to inspect the vehicle for signs of an out of line condition, impact damage or foreign material to the following components: - The transmission - The engine mounts - The transmission rear mount and crossmember - Vehicle frame damage that alters the front to rear alignment of the driveshaft - The driveshafts (both front and rear) - The wheels (caked with mud, concrete, etc.) - The tires (roundness, lack of cupping, excessive balance weights) - The transfer case (if the vehicle is 4WD) ^ A worn or damaged driveshaft U-Joint has shown to be a frequent cause of transmission case cracking, especially on vehicles that see extended periods of highway driving. Always inspect the U-joint condition when diagnosing this condition. ^ For driveshaft damage or imbalance, Inspect the driveshafts (both front and rear) for dents, straightness/runout or signs of missing balance weights. Also, inspect for foreign material such as undercoat sprayed on the driveshaft. ^ The driveshaft working angles may be excessive or non-canceling, especially if the vehicle carrying height has been altered (lifted or lowered) or if the frame has been extended or modified. ^ Damaged or worn upper or lower rear control arms or bushings. ^ A rear axle that is not seated in the rear spring properly (leaf spring vehicles). ^ Broken rear springs and or worn leaf spring bushings. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Case, A/T > Component Information > Technical Service Bulletins > A/T - Cracked Case Diagnosis > Page 10160 In some cases, the customer may not comment about a vibration but it is important to test drive the vehicle while using the electronic vibration analysis tool in an attempt to locate the cause of the torsional vibration. Refer to the Vibration Diagnosis and Correction sub-section of the appropriate Service Manual for more details on diagnosing and correcting vibrations. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Channel Plate, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent Channel Plate: Customer Interest A/T - 4T65E Fluid Leaking From A/T Vent TECHNICAL Bulletin No.: 01-07-30-032E Date: September 29, 2008 Subject: Transmission Oil Leaking From Transmission Vent (Replace Transmission Case Cover (Channel Plate) Gasket) Models: 1997-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) with Hydra-Matic 4T65-E Automatic Transmission (RPOs MN3, MN7, M15, M76) Supercede: This bulletin is being revised to add the 2008 and 2009 model years. Please discard Corporate Bulletin Number 01-07-30-032D (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak. Cause This condition may be caused by an improperly torqued channel plate gasket. Correction To correct this condition, replace the case cover (channel plate) gaskets (429 and 430). Refer to Unit Repair publication in SI of the appropriate vehicle being serviced. Visual inspection of the upper gasket (1) will reveal damage at the referenced area. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Channel Plate, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent > Page 10169 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Channel Plate, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Channel Plate: > 01-07-30-036H > Jan > 09 > A/T Control - DTC P0756 Diagnostic Tips Channel Plate: All Technical Service Bulletins A/T Control - DTC P0756 Diagnostic Tips INFORMATION Bulletin No.: 01-07-30-036H Date: January 29, 2009 Subject: Diagnostic Tips for Automatic Transmission DTC P0756, Second, Third, Fourth Gear Start Models: 2009 and Prior GM Passenger Cars and Light Duty Trucks 2009 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with 4L60-E, 4L65-E or 4L70E Automatic Transmission (RPOs M30, M32 or M70) Supercede: This bulletin is being revised to add the 2009 model year and add details regarding spacer plates. Please discard Corporate Bulletin Number 01-07-30-036G (Section 07 - Transmission/Transaxle). Some dealership technicians may have difficulty diagnosing DTC P0756, 2-3 Shift Valve Performance on 4L60-E, 4L65-E or 4L70E automatic transmissions. As detailed in the Service Manual, when the PCM detects a 4-3-3-4 shift pattern, DTC P0756 will set. Some customers may also describe a condition of a second, third or fourth gear start that may have the same causes but has not set this DTC yet. Below are some tips when diagnosing this DTC: ^ This is a performance code. This means that a mechanical malfunction exists. ^ This code is not set by electrical issues such as a damaged wiring harness or poor electrical connections. Electrical problems would cause a DTC P0758, P0787 or P0788 to set. ^ The most likely cause is chips/debris plugging the filtered AFL oil at orifice # 29 on the top of the spacer plate (48). This is a very small hole and is easily plugged by a small amount of debris. It is important to remove the spacer plate and inspect orifice # 29 and the immediate area for the presence of chips/debris. Also, the transmission case passage directly above this orifice and the valve body passage directly below should be inspected and cleaned of any chips/debris. For 2003 and newer vehicles the spacer plate should be replaced. The service replacement spacer plate is a bonded style with gaskets and solenoid filter screens bonded to the spacer plate. These screens can help to prevent plugging of orifice # 29 caused by small debris or chips. ^ This code could be set if the 2-3 shift valve (368) were stuck or hung-up in its bore. Inspect the 2-3 shift valve (368) and the 2-3 shuttle valve (369) for free movement or damage and clean the valves, the bore and the valve body passages. ^ This code could be set by a 2-3 shift solenoid (367b) if it were cracked, broken or leaking. Refer to Shift Solenoid Leak Test in the appropriate Service Manual for the leak test procedure. Based on parts return findings, a damaged or leaking shift solenoid is the least likely cause of this condition. Simply replacing a shift solenoid will not correct this condition unless the solenoid has been found to be cracked, broken or leaking. It is important to also refer to the appropriate Service Manual or Service Information (SI) for further possible causes of this condition. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Channel Plate, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Channel Plate: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent Channel Plate: All Technical Service Bulletins A/T - 4T65E Fluid Leaking From A/T Vent TECHNICAL Bulletin No.: 01-07-30-032E Date: September 29, 2008 Subject: Transmission Oil Leaking From Transmission Vent (Replace Transmission Case Cover (Channel Plate) Gasket) Models: 1997-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) with Hydra-Matic 4T65-E Automatic Transmission (RPOs MN3, MN7, M15, M76) Supercede: This bulletin is being revised to add the 2008 and 2009 model years. Please discard Corporate Bulletin Number 01-07-30-032D (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak. Cause This condition may be caused by an improperly torqued channel plate gasket. Correction To correct this condition, replace the case cover (channel plate) gaskets (429 and 430). Refer to Unit Repair publication in SI of the appropriate vehicle being serviced. Visual inspection of the upper gasket (1) will reveal damage at the referenced area. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Channel Plate, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Channel Plate: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent > Page 10179 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Channel Plate, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Channel Plate: > 01-07-30-036H > Jan > 09 > A/T Control - DTC P0756 Diagnostic Tips Channel Plate: All Technical Service Bulletins A/T Control - DTC P0756 Diagnostic Tips INFORMATION Bulletin No.: 01-07-30-036H Date: January 29, 2009 Subject: Diagnostic Tips for Automatic Transmission DTC P0756, Second, Third, Fourth Gear Start Models: 2009 and Prior GM Passenger Cars and Light Duty Trucks 2009 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with 4L60-E, 4L65-E or 4L70E Automatic Transmission (RPOs M30, M32 or M70) Supercede: This bulletin is being revised to add the 2009 model year and add details regarding spacer plates. Please discard Corporate Bulletin Number 01-07-30-036G (Section 07 - Transmission/Transaxle). Some dealership technicians may have difficulty diagnosing DTC P0756, 2-3 Shift Valve Performance on 4L60-E, 4L65-E or 4L70E automatic transmissions. As detailed in the Service Manual, when the PCM detects a 4-3-3-4 shift pattern, DTC P0756 will set. Some customers may also describe a condition of a second, third or fourth gear start that may have the same causes but has not set this DTC yet. Below are some tips when diagnosing this DTC: ^ This is a performance code. This means that a mechanical malfunction exists. ^ This code is not set by electrical issues such as a damaged wiring harness or poor electrical connections. Electrical problems would cause a DTC P0758, P0787 or P0788 to set. ^ The most likely cause is chips/debris plugging the filtered AFL oil at orifice # 29 on the top of the spacer plate (48). This is a very small hole and is easily plugged by a small amount of debris. It is important to remove the spacer plate and inspect orifice # 29 and the immediate area for the presence of chips/debris. Also, the transmission case passage directly above this orifice and the valve body passage directly below should be inspected and cleaned of any chips/debris. For 2003 and newer vehicles the spacer plate should be replaced. The service replacement spacer plate is a bonded style with gaskets and solenoid filter screens bonded to the spacer plate. These screens can help to prevent plugging of orifice # 29 caused by small debris or chips. ^ This code could be set if the 2-3 shift valve (368) were stuck or hung-up in its bore. Inspect the 2-3 shift valve (368) and the 2-3 shuttle valve (369) for free movement or damage and clean the valves, the bore and the valve body passages. ^ This code could be set by a 2-3 shift solenoid (367b) if it were cracked, broken or leaking. Refer to Shift Solenoid Leak Test in the appropriate Service Manual for the leak test procedure. Based on parts return findings, a damaged or leaking shift solenoid is the least likely cause of this condition. Simply replacing a shift solenoid will not correct this condition unless the solenoid has been found to be cracked, broken or leaking. It is important to also refer to the appropriate Service Manual or Service Information (SI) for further possible causes of this condition. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > Customer Interest for Clutch: > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear Clutch: Customer Interest A/T - No Movement in Drive or 3rd Gear TECHNICAL Bulletin No.: 08-07-30-027 Date: June 04, 2008 Subject: No Movement When Transmission is Shifted to Drive or Third - Normal Operation When Shifted to Second, First or Reverse (Replace Forward Sprag Assembly) Models: 1982 - 2005 GM Passenger Cars and Light Duty Trucks 2006 - 2007 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet SSR 2006 - 2008 Chevrolet Avalanche, Colorado, Express, Silverado Classic, Silverado, Suburban, Tahoe, TrailBlazer 2006 GMC Yukon Denali, Yukon Denali XL 2006 - 2008 GMC Canyon, Envoy, Savana, Sierra Classic, Sierra, Yukon, Yukon XL 2006 Pontiac GTO 2006 - 2007 HUMMER H2 2006 - 2008 HUMMER H3 2006 - 2008 Saab 9-7X with 4L60, 4L60E, 4L65E or 4L70E Automatic Transmission (RPOs MD8, M30, M32, M33 or M70) Condition Some customers may comment that the vehicle has no movement when the transmission is shifted to DRIVE or THIRD position, but there is normal operation when it is shifted to SECOND, FIRST or REVERSE position. Cause This condition may be caused by a damaged forward sprag assembly (642). Correction When inspecting the sprag, it is important to test the sprag for proper operation by holding the outer race (644) with one hand while rotating the input sun gear (640) with the other hand. The sun gear should rotate only in the counterclockwise direction with the input sun gear facing upward. If the sprag rotates in both directions or will not rotate in either direction, the sprag elements should be inspected by removing one of the sprag assembly retaining rings (643). Refer to SI Unit Repair section for forward clutch sprag disassembly procedures. If the sprag is found to be damaged, make repairs to the transmission as necessary. A new forward roller clutch sprag assembly is now available from GMSPO. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > Customer Interest for Clutch: > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 10193 If clutch debris is found, it is also very important to inspect the Pressure Control (PC) solenoid valve (377) fluid screens. Clean or replace the PC solenoid (377) as necessary. It is also important to flush and flow check the transmission oil cooler using J45096. Refer to SI Automatic Transmission Oil Cooler Flushing and Flow Test for the procedure. The notches above each sprag must point up as shown when assembled into the outer race. Bearing Assembly, Input Sun Gear Snap Ring, Overrun Clutch Hub Retaining Hub, Overrun Clutch Wear Plate, Sprag Assembly Retainer and Race Assembly, Sprag Forward Sprag Assembly Retainer Rings, Sprag Assembly Outer Race, Forward Clutch Washer, Thrust (Input Carrier to Race) The following information applies when this sprag is used in 1982-86 transmissions. The new design sprag can be used on models 1982 through 1986, by replacing the entire assembly (637 - 644). Individual components are NOT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > Customer Interest for Clutch: > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 10194 interchangeable. Important: The wear plate (640) and input thrust washer (660) are not required with the new sprag. Use of the thrust washer and wear plate with the new sprag assembly will cause a misbuild (correct end play cannot be obtained). Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > Customer Interest for Clutch: > 08-07-30-009B > May > 08 > A/T 4T80E, Slips in Gear/L/H Axle Seal Leaks Clutch: Customer Interest A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Clutch: > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear Clutch: All Technical Service Bulletins A/T - No Movement in Drive or 3rd Gear TECHNICAL Bulletin No.: 08-07-30-027 Date: June 04, 2008 Subject: No Movement When Transmission is Shifted to Drive or Third - Normal Operation When Shifted to Second, First or Reverse (Replace Forward Sprag Assembly) Models: 1982 - 2005 GM Passenger Cars and Light Duty Trucks 2006 - 2007 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet SSR 2006 - 2008 Chevrolet Avalanche, Colorado, Express, Silverado Classic, Silverado, Suburban, Tahoe, TrailBlazer 2006 GMC Yukon Denali, Yukon Denali XL 2006 - 2008 GMC Canyon, Envoy, Savana, Sierra Classic, Sierra, Yukon, Yukon XL 2006 Pontiac GTO 2006 - 2007 HUMMER H2 2006 - 2008 HUMMER H3 2006 - 2008 Saab 9-7X with 4L60, 4L60E, 4L65E or 4L70E Automatic Transmission (RPOs MD8, M30, M32, M33 or M70) Condition Some customers may comment that the vehicle has no movement when the transmission is shifted to DRIVE or THIRD position, but there is normal operation when it is shifted to SECOND, FIRST or REVERSE position. Cause This condition may be caused by a damaged forward sprag assembly (642). Correction When inspecting the sprag, it is important to test the sprag for proper operation by holding the outer race (644) with one hand while rotating the input sun gear (640) with the other hand. The sun gear should rotate only in the counterclockwise direction with the input sun gear facing upward. If the sprag rotates in both directions or will not rotate in either direction, the sprag elements should be inspected by removing one of the sprag assembly retaining rings (643). Refer to SI Unit Repair section for forward clutch sprag disassembly procedures. If the sprag is found to be damaged, make repairs to the transmission as necessary. A new forward roller clutch sprag assembly is now available from GMSPO. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Clutch: > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 10204 If clutch debris is found, it is also very important to inspect the Pressure Control (PC) solenoid valve (377) fluid screens. Clean or replace the PC solenoid (377) as necessary. It is also important to flush and flow check the transmission oil cooler using J45096. Refer to SI Automatic Transmission Oil Cooler Flushing and Flow Test for the procedure. The notches above each sprag must point up as shown when assembled into the outer race. Bearing Assembly, Input Sun Gear Snap Ring, Overrun Clutch Hub Retaining Hub, Overrun Clutch Wear Plate, Sprag Assembly Retainer and Race Assembly, Sprag Forward Sprag Assembly Retainer Rings, Sprag Assembly Outer Race, Forward Clutch Washer, Thrust (Input Carrier to Race) The following information applies when this sprag is used in 1982-86 transmissions. The new design sprag can be used on models 1982 through 1986, by replacing the entire assembly (637 - 644). Individual components are NOT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Clutch: > 08-07-30-027 > Jun > 08 > A/T - No Movement in Drive or 3rd Gear > Page 10205 interchangeable. Important: The wear plate (640) and input thrust washer (660) are not required with the new sprag. Use of the thrust washer and wear plate with the new sprag assembly will cause a misbuild (correct end play cannot be obtained). Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Clutch, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Clutch: > 08-07-30-009B > May > 08 > A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks Clutch: All Technical Service Bulletins A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Engine, A/T Controls - Shared Diagnostic Trouble Codes Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10214 Control Module: Locations Automatic Transmission Electronic Component Views Transmission Control Module (TCM) 1 - Engine Harness 2 - Transmission Control Module (TCM) 3 - Transmission Control Module (TCM) Connector Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10215 Control Module: Diagrams Automatic Transmission Related Connector End Views Transmission Control Module (TCM), Engine Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10216 Transmission Control Module (TCM), Engine Side (5.3L and 6.0L) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10217 Control Module: Service and Repair Transmission Control Module (TCM) Replacement Service of the transmission control module (TCM) should consist of reprogramming of the TCM. If the diagnostic procedures call for the TCM to be replaced, the replacement TCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty TCM and install the new service TCM. The replacement TCM must be programmed. Removal Procedure 1. Disconnect the negative battery cable. 2. Disconnect the cooling fan electrical connector for additional clearance while removing the TCM. 3. Depress the engine control module (ECM)/TCM cover retainers (2). 4. Remove the ECM/TCM cover from the ECM/TCM bracket (1). 5. Disconnect the TCM electrical connector (1) from the TCM (2) Notice: Refer to Handling ESD Sensitive Parts Notice. Important: It is not necessary to disconnect the TCM electrical connectors in order to remove the TCM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. Important: Remove any debris from around the TCM connector surfaces before servicing the TCM. Inspect the TCM module connector gaskets when diagnosing or replacing the TCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the TCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10218 6. Release the bracket TCM retainer (1). 7. Tilt the TCM (2) away from the ECM/TCM bracket. 8. Remove the TCM (1) from the TCM bracket (2). 9. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the ECM (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10219 10. Remove the ECM/TCM bracket retaining bolts (2). 11. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. Tighten the bolts to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10220 4. If the ECM was previously removed from the ECM/TCM bracket (2), install the ECM (3). 5. Insert the TCM (1) into the retaining slot of the ECM/TCM bracket (2). 6. Secure the TCM (2) to the ECM/TCM mounting bracket ensuring the TCM retaining tab (1) is fully engaged. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10221 7. Connect the ECM electrical connector (1) to the TCM (2) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. 12. If the TCM was replaced the replacement TCM must be programmed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Extension Housing, A/T > Component Information > Service and Repair Extension Housing: Service and Repair Transmission Extension Housing Assembly Replacement Removal Procedure 1. Raise and suitably support the vehicle. 2. Support the transmission with a transmission jack. 3. Place a drain pan under the vehicle. 4. Remove the propeller shaft. 5. Remove the transmission mount. 6. Remove the case extension bolts (1). 7. Remove the case extension (2). 8. Remove and discard the case extension O ring seal (3). Installation Procedure 1. Install a new case extension O ring seal (3). 2. Install the case extension (2). Notice: Refer to Fastener Notice in Service Precautions. 3. Install the case extension bolts (1). Tighten the case extension bolts (1) to 45 Nm (33 ft. lbs.). 4. Install the transmission mount. 5. Install the propeller shaft. 6. Remove the drain pan and the transmission jack. 7. Lower the vehicle. 8. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information Fluid - A/T: Technical Service Bulletins A/T - DEXRON(R)-VI Fluid Information INFORMATION Bulletin No.: 04-07-30-037E Date: April 07, 2011 Subject: Release of DEXRON(R)-VI Automatic Transmission Fluid (ATF) Models: 2008 and Prior GM Passenger Cars and Light Duty Trucks 2003-2008 HUMMER H2 2006-2008 HUMMER H3 2005-2007 Saturn Relay 2005 and Prior Saturn L-Series 2005-2007 Saturn ION 2005-2008 Saturn VUE with 4T45-E 2005-2008 Saab 9-7X Except 2008 and Prior Chevrolet Aveo, Equinox Except 2006 and Prior Chevrolet Epica Except 2007 and Prior Chevrolet Optra Except 2008 and Prior Pontiac Torrent, Vibe, Wave Except 2003-2005 Saturn ION with CVT or AF23 Only Except 1991-2002 Saturn S-Series Except 2008 and Prior Saturn VUE with CVT, AF33 or 5AT (MJ7/MJ8) Transmission Only Except 2008 Saturn Astra Attention: DEXRON(R)-VI Automatic Transmission Fluid (ATF) is the only approved fluid for warranty repairs for General Motors transmissions/transaxles requiring DEXRON(R)-III and/or prior DEXRON(R) transmission fluids. Supercede: This bulletin is being revised to update information. Please discard Corporate Bulletin Number 04-07-30-037D (Section 07 - Transmission/Transaxle). MANUAL TRANSMISSIONS / TRANSFER CASES and POWER STEERING The content of this bulletin does not apply to manual transmissions or transfer cases. Any vehicle that previously required DEXRON(R)-III for a manual transmission or transfer case should now use P/N 88861800. This fluid is labeled Manual Transmission and Transfer Case Fluid. Some manual transmissions and transfer cases require a different fluid. Appropriate references should be checked when servicing any of these components. Power Steering Systems should now use P/N 9985010 labeled Power Steering Fluid. Consult the Parts Catalog, Owner's Manual, or Service Information (SI) for fluid recommendations. Some of our customers and/or General Motors dealerships/Saturn Retailers may have some concerns with DEXRON(R)-VI and DEXRON(R)-III Automatic Transmission Fluid (ATF) and transmission warranty claims. DEXRON(R)-VI is the only approved fluid for warranty repairs for General Motors transmissions/transaxles requiring DEXRON(R)-III and/or prior DEXRON(R) transmission fluids (except as noted above). Please remember that the clean oil reservoirs of the J-45096 - Flushing and Flow Tester machine should be purged of DEXRON(R)-III and filled with DEXRON(R)-VI for testing, flushing or filling General Motors transmissions/transaxles (except as noted above). DEXRON(R)-VI can be used in any proportion in past model vehicles equipped with an automatic transmission/transaxle in place of DEXRON(R)-III (i.e. topping off the fluid in the event of a repair or fluid change). DEXRON(R)-VI is also compatible with any former version of DEXRON(R) for use in automatic transmissions/transaxles. DEXRON(R)-VI ATF General Motors Powertrain has upgraded to DEXRON(R)-VI ATF with the start of 2006 vehicle production. Current and prior automatic transmission models that had used DEXRON(R)-III must now only use DEXRON(R)-VI. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information > Page 10229 All 2006 and future model transmissions that use DEXRON(R)-VI are to be serviced ONLY with DEXRON(R)-VI fluid. DEXRON(R)-VI is an improvement over DEXRON(R)-III in the following areas: * These ATF change intervals remain the same as DEXRON(R)-III for the time being. 2006-2008 Transmission Fill and Cooler Flushing Some new applications of the 6L80 six speed transmission will require the use of the J 45096 Flushing and Flow Tester to accomplish transmission fluid fill. The clean oil reservoir of the machine should be purged of DEXRON(R)-III and filled with DEXRON(R)-VI. Parts Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information > Page 10230 Fluid - A/T: Technical Service Bulletins A/T - Water Or Coolant Contamination Information INFORMATION Bulletin No.: 08-07-30-035B Date: November 01, 2010 Subject: Information on Water or Ethylene Glycol in Transmission Fluid Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks with Automatic Transmission Supercede: This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 08-07-30-035A (Section 07 - Transmission/Transaxle). Water or ethylene glycol in automatic transmission fluid (ATF) is harmful to internal transmission components and will have a negative effect on reliability and durability of these parts. Water or ethylene glycol in ATF will also change the friction of the clutches, frequently resulting in shudder during engagement or gear changes, especially during torque converter clutch engagement. Indications of water in the ATF may include: - ATF blowing out of the transmission vent tube. - ATF may appear cloudy or, in cases of extreme contamination, have the appearance of a strawberry milkshake. - Visible water in the oil pan. - A milky white substance inside the pan area. - Spacer plate gaskets that appear to be glued to the valve body face or case. - Spacer plate gaskets that appear to be swollen or wrinkled in areas where they are not compressed. - Rust on internal transmission iron/steel components. If water in the ATF has been found and the source of the water entry has not been identified, or if a leaking in-radiator transmission oil cooler is suspected (with no evidence of cross-contamination in the coolant recovery reservoir), a simple and quick test kit is available that detects the presence of ethylene glycol in ATF. The "Gly-Tek" test kit, available from the Nelco Company, should be obtained and the ATF tested to make an accurate decision on the need for radiator replacement. This can help to prevent customer comebacks if the in-radiator transmission oil cooler is leaking and reduce repair expenses by avoiding radiator replacement if the cooler is not leaking. These test kits can be obtained from: Nelco Company Test kits can be ordered by phone or through the website listed above. Orders are shipped standard delivery time but can be shipped on a next day delivery basis for an extra charge. One test kit will complete 10 individual fluid sample tests. For vehicles repaired under warranty, the cost of the complete test kit plus shipping charges should be divided by 10 and submitted on the warranty claim as a net item. The transmission should be repaired or replaced based on the normal cost comparison procedure. Important If water or coolant is found in the transmission, the following components MUST be replaced. - Replace all of the rubber-type seals. - Replace all of the composition-faced clutch plates and/or bands. - Replace all of the nylon parts. - Replace the torque converter. - Thoroughly clean and rebuild the transmission, using new gaskets and oil filter. Important The following steps must be completed when repairing or replacing. Flush and flow check the transmission oil cooler using J 45096. Refer to Corporate Bulletin Number 02-07-30-052F- Automatic Transmission Oil Cooler Flush and Flow Test Essential Tool J 45096 TransFlow. - Thoroughly inspect the engine cooling system and hoses and clean/repair as necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Technical Service Bulletins > A/T - DEXRON(R)-VI Fluid Information > Page 10231 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Capacity Specifications Fluid - A/T: Capacity Specifications AUTOMATIC TRANSMISSION Pan Removal .................................................................................... .......................................................................................................... 4.7 liters (5.0 qts) Overhaul ...... .............................................................................................................................................................. ............................. 10.6 liters (11.0 qts) 280 mm Torque Converter Dry Fill ..................................................................................................................................................... 11.25 liters (11.9 qts) 300 mm Torque Converter Dry Fill ..................................................................................................................................................... 11.50 liters (12.1 qts) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Capacity Specifications > Page 10234 Fluid - A/T: Fluid Type Specifications AUTOMATIC TRANSMISSION DEXRON-VI Automatic Transmission Fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Page 10235 Fluid - A/T: Testing and Inspection Transmission Fluid Checking Procedure 1. Start the engine and operate the vehicle for 15 minutes or until the transmission fluid reaches an operating temperature of 82 - 93°C (180 - 200°F) . 2. Park the vehicle on a level surface. 3. With your foot on the brake, move the shift lever through each gear range. Pause for about 3 seconds in each range, ending in PARK. 4. Apply the parking brake and let the engine idle for 3 minutes. 5. Remove the transmission fluid level indicator. Wipe the indicator clean. Insert the indicator. Give the indicator a full twist in order to close. 6. Wait 3 seconds and remove the indicator. 7. Read both sides of the indicator. The fluid must be within the hot cross-hatched area using the lowest level reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Page 10236 Step 1 - Step 17 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Page 10237 Step 18 - Step 20 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Page 10238 Fluid - A/T: Service and Repair Automatic Transmission Fluid/Filter Replacement Removal Procedure Caution: When the transmission is at operating temperatures, take necessary precautions when removing the drain plug, to avoid being burned by draining fluid. 1. Raise and support the vehicle. 2. Place a drain pan under the transmission oil pan. 3. Remove the oil pan drain plug, if equipped. 4. If necessary, remove the bolts and position aside the range selector cable bracket for clearance while lowering the pan. It is not necessary to remove the cable from the lever or bracket. 5. Remove the oil pan bolts from the front and sides of the pan only. 6. Loosen the rear oil pan bolts approximately 4 turns. 7. Lightly tap the oil pan with a rubber mallet in order to loosen the pan to allow the fluid to drain. 8. Remove the remaining oil pan bolts. 9. Remove the oil pan and the gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Page 10239 10. Grasp firmly while pulling down with a twisting motion in order to remove the filter. 11. Remove the filter seal. The filter seal may be stuck in the pump; if necessary, carefully use pliers or another suitable tool to remove the seal. 12. Discard the seal. 13. Inspect the fluid color. 14. Inspect the filter. Pry the metal crimping away from the top of the filter and pull apart. The filter may contain the following evidence for root cause diagnosis: ^ Clutch material ^ Bronze slivers indicating bushing wear ^ Steel particles 15. Clean the transmission case and the oil pan gasket surfaces with solvent, and air dry. You must remove all traces of the old gasket material. Installation Procedure 1. Coat the new filter seal with automatic transmission fluid. 2. Install the new filter seal into the transmission case. Tap the seal into place using a suitable size socket. 3. Install the new filter into the case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid - A/T > Component Information > Specifications > Page 10240 4. Install the oil pan and a new gasket. 5. Install the oil pan bolts. Tighten the oil pan to transmission case bolts alternately and evenly to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. If previously removed, install the range selector cable bracket and bolts. Tighten the bolts to 25 Nm (18 ft. lbs.). 7. Apply a small amount of sealant GM P/N 12346004 to the threads of the oil pan drain plug, if equipped. 8. Install the oil pan drain plug, if equipped. Tighten the oil pan drain plug to 18 Nm (13 ft. lbs.). 9. Lower the vehicle. 10. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Refer to Transmission Fluid Checking Procedure and Fluid Capacity Specifications. 11. Check the COLD fluid level reading for initial fill only. 12. Inspect the oil pan gasket for leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Filter - A/T > Component Information > Service and Repair Fluid Filter - A/T: Service and Repair Automatic Transmission Fluid/Filter Replacement Removal Procedure Caution: When the transmission is at operating temperatures, take necessary precautions when removing the drain plug, to avoid being burned by draining fluid. 1. Raise and support the vehicle. 2. Place a drain pan under the transmission oil pan. 3. Remove the oil pan drain plug, if equipped. 4. If necessary, remove the bolts and position aside the range selector cable bracket for clearance while lowering the pan. It is not necessary to remove the cable from the lever or bracket. 5. Remove the oil pan bolts from the front and sides of the pan only. 6. Loosen the rear oil pan bolts approximately 4 turns. 7. Lightly tap the oil pan with a rubber mallet in order to loosen the pan to allow the fluid to drain. 8. Remove the remaining oil pan bolts. 9. Remove the oil pan and the gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Filter - A/T > Component Information > Service and Repair > Page 10244 10. Grasp firmly while pulling down with a twisting motion in order to remove the filter. 11. Remove the filter seal. The filter seal may be stuck in the pump; if necessary, carefully use pliers or another suitable tool to remove the seal. 12. Discard the seal. 13. Inspect the fluid color. 14. Inspect the filter. Pry the metal crimping away from the top of the filter and pull apart. The filter may contain the following evidence for root cause diagnosis: ^ Clutch material ^ Bronze slivers indicating bushing wear ^ Steel particles 15. Clean the transmission case and the oil pan gasket surfaces with solvent, and air dry. You must remove all traces of the old gasket material. Installation Procedure 1. Coat the new filter seal with automatic transmission fluid. 2. Install the new filter seal into the transmission case. Tap the seal into place using a suitable size socket. 3. Install the new filter into the case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Filter - A/T > Component Information > Service and Repair > Page 10245 4. Install the oil pan and a new gasket. 5. Install the oil pan bolts. Tighten the oil pan to transmission case bolts alternately and evenly to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. If previously removed, install the range selector cable bracket and bolts. Tighten the bolts to 25 Nm (18 ft. lbs.). 7. Apply a small amount of sealant GM P/N 12346004 to the threads of the oil pan drain plug, if equipped. 8. Install the oil pan drain plug, if equipped. Tighten the oil pan drain plug to 18 Nm (13 ft. lbs.). 9. Lower the vehicle. 10. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Refer to Transmission Fluid Checking Procedure and Fluid Capacity Specifications. 11. Check the COLD fluid level reading for initial fill only. 12. Inspect the oil pan gasket for leaks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Technical Service Bulletins > A/T - Revised Converter Check Valve/Cooler Line Fitting Fluid Line/Hose: Technical Service Bulletins A/T - Revised Converter Check Valve/Cooler Line Fitting INFORMATION Bulletin No.: 04-07-30-017B Date: November 25, 2008 Subject: Information on 4T65-E MN7, M15, M76, MN3 Automatic Transmission Case, Cooler Fitting and Torque Converter Drain Back Check Ball Change Models: 2008 and Prior GM Passenger Cars and Light Duty Trucks with one of the HYDRA-MATIC(R) Automatic Transmissions shown above. Supercede: This bulletin is being revised to update the Parts Information. Please discard Corporate Bulletin Number 04-07-30-017A (Section 07 - Transmission/Transaxle). Effective with Julian date 4019 (January 19, 2004), the 4T65E transaxle cases and cooler fittings have changed and are not interchangeable with past models. The technician may find that when replacing the inlet or outlet transmission cooler lines, the new lines cannot be connected to the transmission. A change to the transmission cooler line fittings was implemented in production on February 1, 2004. The cooler line fittings were changed to a design with a longer lead in pilot (1). The cooler line fittings with the longer lead in pilot will not fit on models built before February 1, 2004. The longer lead in pilot fittings (1) (9/16-18 UNF) have replaced the shorter lead in pilot fittings (2) (3/8-18 NPSF w/check ball & 1/4-18 NPSF). If the transmission cooler lines will not connect, then replace them with the following cooler line fittings as appropriate with the older, shorter lead in pilot design: ^ For vehicles built prior to February 1, 2004, use Transmission Fluid Cooler Inlet Hose, P/N 20793004. ^ For vehicles built after February 1, 2004, use Transmission Fluid Cooler Inlet Hose, second design P/N 15264588. ^ For vehicles built prior to February 1, 2004, use Transmission Fluid Cooler Outlet Hose, P/N 20793005. ^ For vehicles built after February 1, 2004, use Transmission Fluid Cooler Outlet Hose, second design P/N 15264589. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Technical Service Bulletins > A/T - Revised Converter Check Valve/Cooler Line Fitting > Page 10250 The torque specification has changed for the fittings to case. The torque has changed from 38 Nm (28 lb ft) to 32 Nm (23 lb ft). Tighten Tighten the new cooler fittings to 32 Nm (23 lb ft). The converter drain back check ball (420C) has been removed from the cooler line fitting and is now located in the channel plate. If you get a concern of no movement in the morning or after sitting for several hours, the cooler check ball should be inspected. The best way to determine where the check ball is located is to look at the cooler line fittings. The old fittings are different sizes (3/8-18 NPSF & 1/4-18 NPSF) and would contain the cooler check ball. The new fittings are the same size as each other (9/16-18 UNF) and do not have a cooler check ball. Parts Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Technical Service Bulletins > A/T - Revised Converter Check Valve/Cooler Line Fitting > Page 10251 Fluid Line/Hose: Technical Service Bulletins A/T - Cooler Line Fitting Applications Bulletin No.: 08-07-30-004 Date: January 31, 2008 INFORMATION Subject: 4L60-E, 4L65-E, 4L70-E HYDRA-MATIC(R) Automatic Transmission (RPOs M30, M70 M32, M33, MK2 MD6) Oil Cooler Fitting Change Models: 1997-2008 GM Light Duty Trucks (Including Saab) with 4L60-E, 4L65-E, 4L70-E HYDRA-MATIC(R) Automatic Transmission (RPOs M30, M70, M3, M33, MK2, MD6) Aluminum cooler line fittings - These new fittings (2) cannot be used on earlier cases because the threaded hole is not the same size. Old style fittings (1) will continue to be available through SPO parts. Service cases will be the new case and fittings. The old cases with the old thread design will not be maintained for service. The connection on the hose side will accept both the short snout and the newer longer snout cooler hose assemblies. The fittings (1) have a new torque specification of 20 N.m (14 lb ft). They also have one inner and one outer "0" ring that are not serviced separately. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Technical Service Bulletins > A/T - Revised Converter Check Valve/Cooler Line Fitting > Page 10252 The new thread size 9/16-1a UNF-2A (1) was implemented on 11-29-07 or Julian date 333. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Service and Repair > Transmission Fluid Cooler Hose/Pipe Replacement Fluid Line/Hose: Service and Repair Transmission Fluid Cooler Hose/Pipe Replacement Transmission Fluid Cooler Hose/Pipe Replacement (Body Vin Code 6 LM4) Removal Procedure 1. Disconnect the transmission cooler lines from the radiator. 2. Remove the rear sections of the cooler lines from the retainer (2) located on the right side of the engine. 3. Remove the clip that holds the cooler lines together. 4. Support the transmission with a transmission jack. 5. Remove the transmission support. 6. Remove the front exhaust pipe assembly. 7. Carefully lower the transmission to gain access to the cooler line fittings. 8. Place a drain pan under the vehicle. 9. Disconnect the transmission cooler lines from the transmission. 10. Disconnect the rear oil cooler lines (2) from the front oil cooler lines (1). 11. Remove the oil cooler lines from the vehicle. Installation Procedure 1. Install the transmission oil cooler lines to the vehicle. 2. Install the transmission cooler lines to the transmission. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Service and Repair > Transmission Fluid Cooler Hose/Pipe Replacement > Page 10255 3. Connect the rear cooler lines (2) to the front cooler lines (1). 4. Install the cooling line ends (3) to the transmission. 5. Raise the transmission into position. 6. Install the front exhaust pipe assembly. 7. Install the transmission support. 8. Remove the transmission jack. 9. Install the clip that holds the cooler lines together. 10. Install the cooler lines to the retainer (2) located on the right side of the engine. 11. Install the front sections of the cooler lines to the vehicle. 12. Install the cooler lines to the retainer located on the radiator shroud. 13. Connect the front and rear cooler lines at the quick connect fitting. 14. Install the cooler lines (4,5) to the radiator. 15. Remove the drain pan from under the vehicle. 16. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Service and Repair > Transmission Fluid Cooler Hose/Pipe Replacement > Page 10256 17. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Refer to Fluid Capacity Specifications. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Service and Repair > Transmission Fluid Cooler Hose/Pipe Replacement > Page 10257 Fluid Line/Hose: Service and Repair Transmission Fluid Cooler Line Quick Connect Fitting Transmission Fluid Cooler Line Quick Connect Fitting Removal Procedure 1. Important: Perform the following procedure when removing the retaining rings and cooler lines from the quick connect fittings located on the radiator and/or the transmission. Pull the plastic cap back from the quick connect fitting and down along the cooler line about 5 cm (2 inch). 2. Using a bent-tip screwdriver, pull on one of the open ends of the retaining ring in order to rotate the retaining ring around the quick connect fitting until the retaining ring is out of position and can be completely removed. 3. Remove the retaining ring from the quick connect fitting. 4. Discard the retaining ring. 5. Pull the cooler line straight out from the quick connect fitting. Installation Procedure 1. Install a new retaining ring into the quick connect fitting using the following procedure: Important: ^ Do not reuse any of the existing oil lines or oil line fittings if there is excessive corrosion. ^ Do not reuse any of the existing retaining rings that were removed from the existing quick connect fittings. Install new retaining rings. ^ Ensure the following procedures are performed when installing the new retaining rings onto the fittings. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Service and Repair > Transmission Fluid Cooler Hose/Pipe Replacement > Page 10258 2. Hook one of the open ends of the retaining ring in one of the slots in the quick connect fitting. 3. Rotate the retaining ring around the fitting until the retaining ring is positioned with all three ears through the three slots on the fitting. 4. Do not install the new retaining ring onto the fitting by pushing the retaining ring. 5. Ensure that the three retaining ring ears are seen from inside the fitting and that the retaining ring moves freely in the fitting slots. 6. Install the cooler line into the quick connect fitting. 7. Insert the cooler line end into the quick connect fitting until a click is either heard or felt. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Service and Repair > Transmission Fluid Cooler Hose/Pipe Replacement > Page 10259 8. Do not use the plastic cap on the cooler line in order to install the cooler line into the fitting. 9. Pull back sharply on the cooler line in order to ensure that the cooler line is fastened into the quick connect fitting. 10. Position (snap) the plastic cap onto the fitting. Do not manually depress the retaining ring when installing the plastic cap onto the quick connect fitting. Important: Do not manually depress the retaining clip when installing the plastic cap. 11. Ensure that the plastic cap is fully seated against the fitting. 12. Ensure that no gap is present between the cap and the fitting. 13. Ensure that the yellow identification band on the tube is hidden within the quick connect fitting. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Line/Hose, A/T > Component Information > Service and Repair > Transmission Fluid Cooler Hose/Pipe Replacement > Page 10260 14. A hidden yellow identification band indicates proper joint seating. 15. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pan, A/T > Component Information > Specifications Fluid Pan: Specifications Oil Passage Cover to Case Bolt ............................................................................................................................................... 8 - 14 Nm (71 - 124 inch lbs.) Transmission Oil Pan to Case Bolt .................................................................................................................................... 9.5 - 13.8 Nm (84 - 122 inch lbs.) Oil pan bolts. Tighten the oil pan to transmission case bolts alternately and evenly to ......................................................................................... 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications TFP Manual Valve Position Switch Logic Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10267 Fluid Pressure Sensor/Switch: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10268 Fluid Pressure Sensor/Switch: Diagrams Automatic Transmission Inline 20-Way Connector End View Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10269 Fluid Pressure Sensor/Switch: Service and Repair Valve Body and Pressure Switch Replacement Removal Procedure 1. Ensure that removal of the valve body is necessary before proceeding. ^ Important: The following components can be serviced without removing the valve body from the transmission: The torque converter clutch solenoid (1) ^ The pressure control solenoid (2) ^ The internal wiring harness (3) ^ The 2-3 shift solenoid (4) ^ The 1-2 shift solenoid (5) ^ The transmission fluid pressure manual valve position switch (6) ^ The 3-2 shift solenoid (7) ^ The torque converter clutch pulse width modulation (TCC PWM) solenoid (8) 2. Remove the fluid level indicator. 3. Raise the vehicle. 4. Remove the oil pan, gasket, and filter. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10270 6. Remove the fluid indicator stop bracket bolt (2). 7. Remove the fluid indicator bracket (1). 8. Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible. 9. Remove the TCC PWM solenoid (1) in order to access the TCC solenoid retaining bolts. 10. Remove the TCC solenoid retaining bolts. 11. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body. 12. Reposition the harness to the side of the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10271 13. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. 14. Remove the transmission fluid pressure switch. 15. Inspect the transmission fluid pressure switch for damage or debris. 16. Remove the manual detent spring retaining bolt. 17. Remove the manual detent spring. 18. Inspect the manual detent spring for cracks or damage. 19. Remove the remaining control valve body bolts. Important: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10272 20. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. Installation Procedure Ball Check Valves 1. Install the checkballs (1-7) in the valve body. 2. Install the control valve body to the transmission case while simultaneously connecting the manual valve link to the manual valve. 3. Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2). 4. Install one bolt (M6 X 1.0 X 47.5) hand tight in the center (1) of the valve body to hold it in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10273 5. Do not install the transmission fluid indicator stop bracket and bolt at this time. Install but do not tighten the control valve body bolts which retain only the valve body directly. Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following: ^ M6 X 1.0 X 65.0 (1) ^ M6 X 1.0 X 54.4 (2) ^ M6 X 1.0 X 47.5 (3) ^ M6 X 1.0 X 35.0 (4) ^ M8 X 1.0 X 20.0 (5) ^ M6 X 1.0 X 12.0 (6) ^ M6 X 1.0 X 18.0 (7) Important: When installing bolts throughout this procedure, be sure to use the correct bolt size and length in the correct location as specified. 6. Install the manual detent spring. 7. Install but do not tighten the manual detent spring retaining bolt. 8. Install the transmission fluid pressure switch. 9. Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10274 10. Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows. Tighten the control valve body bolts (in sequence) to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation. 11. Ensure that the manual detent spring is aligned properly with the detent lever. Tighten the manual detent spring bolt to 31 Nm (23 ft. lbs.). 12. Install the TCC solenoid with a new O-ring seal to the valve body. 13. Install the TCC solenoid bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10275 Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). 14. Install the internal wiring harness to the valve body. The internal wiring harness has a tab (1) on the edge of the conduit. 15. Place the tab between the valve body and the pressure switch in the location shown (2). Press the harness into position on the valve body bolt bosses (1, 3). 16. Install the TCC PWM solenoid (1) to the control valve body. 17. Install the TCC PWM solenoid retainer (2). 18. Install the transmission fluid indicator stop bracket (1) and bolt (2). Tighten the transmission fluid indicator stop bracket bolt to 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10276 19. Connect the internal wiring harness electrical connectors to the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) 20. Install the transmission oil pan and filter. 21. Lower the vehicle. 22. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 23. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > Customer Interest for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Fluid Pump: Customer Interest A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > Customer Interest for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10285 Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > Customer Interest for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10286 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > Customer Interest for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10287 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Fluid Pump: All Technical Service Bulletins A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10293 Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10294 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Fluid Pump, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid Pump: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10295 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Lamps and Indicators A/T > Shift Indicator > Component Information > Description and Operation Shift Indicator: Description and Operation PRND321 DISPLAY The instrument panel cluster (IPC) displays the selected gear position as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the gear position. The PRND321 display blanks if: - The PCM detects a malfunction in the transmission range switch circuit. - The IPC detects a loss of class 2 communications with the PCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Output Shaft, A/T > Component Information > Technical Service Bulletins > A/T - 2-3 Upshift or 3-2 Downshift Clunk Noise Output Shaft: Technical Service Bulletins A/T - 2-3 Upshift or 3-2 Downshift Clunk Noise INFORMATION Bulletin No.: 01-07-30-042F Date: February 05, 2010 Subject: Information on 2-3 Upshift or 3-2 Downshift Clunk Noise Models: 2010 and Prior GM Passenger Cars and Light Duty Trucks 2010 and Prior HUMMER H2, H3 2005-2009 Saab 9-7X with 4L60-E, 4L65-E or 4L70-E Automatic Transmission (RPOs M30, M32, M70) Supercede: This bulletin is being revised to add the 2010 model year and 4L70E transmission. Please discard Corporate Bulletin Number 01-07-30-042E (Section 07 - Transmission/Transaxle). Important For 2005 model year fullsize utilities and pickups, refer to Corporate Bulletin 05-07-30-012. Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or a 3-2 downshift. During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be worse on a 4-wheel drive vehicle due to the additional tolerances in the transfer case. This is a normal condition. No repairs should be attempted. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Pressure Regulating Solenoid, A/T > Component Information > Diagrams Pressure Regulating Solenoid: Diagrams Automatic Transmission Inline 20-Way Connector End View Pressure Control (PC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 10307 Pressure Regulating Solenoid: Service and Repair Pressure Regulator Replacement Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and filter. 3. Compress the reverse boost valve sleeve into the bore of the oil pump to release tension on the reverse boost valve retaining ring. 4. Remove the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 5. Remove the reverse boost valve sleeve (5) and the reverse boost valve (4). 6. Remove the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 7. Remove the pressure regulator valve (1). Installation Procedure 1. Install the pressure regulator valve (1). 2. Install the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 3. Install the reverse boost valve (4) in the reverse boost valve sleeve (5). 4. Install the reverse boost valve (4) and sleeve (5) in the oil pump cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 10308 5. Compress the reverse boost valve sleeve into the bore of the oil pump to expose the retaining ring slot. 6. Install the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 7. Install the transmission oil filter and pan. 8. Lower the vehicle. 9. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 10. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Engine, A/T Controls - Shared Diagnostic Trouble Codes Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10314 Control Module: Locations Automatic Transmission Electronic Component Views Transmission Control Module (TCM) 1 - Engine Harness 2 - Transmission Control Module (TCM) 3 - Transmission Control Module (TCM) Connector Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10315 Control Module: Diagrams Automatic Transmission Related Connector End Views Transmission Control Module (TCM), Engine Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10316 Transmission Control Module (TCM), Engine Side (5.3L and 6.0L) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10317 Control Module: Service and Repair Transmission Control Module (TCM) Replacement Service of the transmission control module (TCM) should consist of reprogramming of the TCM. If the diagnostic procedures call for the TCM to be replaced, the replacement TCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty TCM and install the new service TCM. The replacement TCM must be programmed. Removal Procedure 1. Disconnect the negative battery cable. 2. Disconnect the cooling fan electrical connector for additional clearance while removing the TCM. 3. Depress the engine control module (ECM)/TCM cover retainers (2). 4. Remove the ECM/TCM cover from the ECM/TCM bracket (1). 5. Disconnect the TCM electrical connector (1) from the TCM (2) Notice: Refer to Handling ESD Sensitive Parts Notice. Important: It is not necessary to disconnect the TCM electrical connectors in order to remove the TCM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. Important: Remove any debris from around the TCM connector surfaces before servicing the TCM. Inspect the TCM module connector gaskets when diagnosing or replacing the TCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the TCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10318 6. Release the bracket TCM retainer (1). 7. Tilt the TCM (2) away from the ECM/TCM bracket. 8. Remove the TCM (1) from the TCM bracket (2). 9. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the ECM (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10319 10. Remove the ECM/TCM bracket retaining bolts (2). 11. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. Tighten the bolts to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10320 4. If the ECM was previously removed from the ECM/TCM bracket (2), install the ECM (3). 5. Insert the TCM (1) into the retaining slot of the ECM/TCM bracket (2). 6. Secure the TCM (2) to the ECM/TCM mounting bracket ensuring the TCM retaining tab (1) is fully engaged. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Relays and Modules A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 10321 7. Connect the ECM electrical connector (1) to the TCM (2) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. 12. If the TCM was replaced the replacement TCM must be programmed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > Customer Interest for Seals and Gaskets: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent Seals and Gaskets: Customer Interest A/T - 4T65E Fluid Leaking From A/T Vent TECHNICAL Bulletin No.: 01-07-30-032E Date: September 29, 2008 Subject: Transmission Oil Leaking From Transmission Vent (Replace Transmission Case Cover (Channel Plate) Gasket) Models: 1997-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) with Hydra-Matic 4T65-E Automatic Transmission (RPOs MN3, MN7, M15, M76) Supercede: This bulletin is being revised to add the 2008 and 2009 model years. Please discard Corporate Bulletin Number 01-07-30-032D (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak. Cause This condition may be caused by an improperly torqued channel plate gasket. Correction To correct this condition, replace the case cover (channel plate) gaskets (429 and 430). Refer to Unit Repair publication in SI of the appropriate vehicle being serviced. Visual inspection of the upper gasket (1) will reveal damage at the referenced area. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > Customer Interest for Seals and Gaskets: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent > Page 10330 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > Customer Interest for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Seals and Gaskets: Customer Interest A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > Customer Interest for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10335 Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > Customer Interest for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10336 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > Customer Interest for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10337 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent Seals and Gaskets: All Technical Service Bulletins A/T - 4T65E Fluid Leaking From A/T Vent TECHNICAL Bulletin No.: 01-07-30-032E Date: September 29, 2008 Subject: Transmission Oil Leaking From Transmission Vent (Replace Transmission Case Cover (Channel Plate) Gasket) Models: 1997-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) with Hydra-Matic 4T65-E Automatic Transmission (RPOs MN3, MN7, M15, M76) Supercede: This bulletin is being revised to add the 2008 and 2009 model years. Please discard Corporate Bulletin Number 01-07-30-032D (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak. Cause This condition may be caused by an improperly torqued channel plate gasket. Correction To correct this condition, replace the case cover (channel plate) gaskets (429 and 430). Refer to Unit Repair publication in SI of the appropriate vehicle being serviced. Visual inspection of the upper gasket (1) will reveal damage at the referenced area. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > 01-07-30-032E > Sep > 08 > A/T - 4T65E Fluid Leaking From A/T Vent > Page 10343 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Seals and Gaskets: All Technical Service Bulletins A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10348 Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10349 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10350 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10351 Seals and Gaskets: By Symptom Technical Service Bulletin # 01-07-30-032E Date: 080929 A/T - 4T65E Fluid Leaking From A/T Vent TECHNICAL Bulletin No.: 01-07-30-032E Date: September 29, 2008 Subject: Transmission Oil Leaking From Transmission Vent (Replace Transmission Case Cover (Channel Plate) Gasket) Models: 1997-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) with Hydra-Matic 4T65-E Automatic Transmission (RPOs MN3, MN7, M15, M76) Supercede: This bulletin is being revised to add the 2008 and 2009 model years. Please discard Corporate Bulletin Number 01-07-30-032D (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak. Cause This condition may be caused by an improperly torqued channel plate gasket. Correction To correct this condition, replace the case cover (channel plate) gaskets (429 and 430). Refer to Unit Repair publication in SI of the appropriate vehicle being serviced. Visual inspection of the upper gasket (1) will reveal damage at the referenced area. Parts Information Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10352 For vehicles repaired under warranty, use the table. Disclaimer Technical Service Bulletin # 06-07-30-016 Date: 060718 A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10353 Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10354 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10355 For vehicles repaired under warranty, use the table. Disclaimer Technical Service Bulletin # 01-07-30-032E Date: 080929 A/T - 4T65E Fluid Leaking From A/T Vent TECHNICAL Bulletin No.: 01-07-30-032E Date: September 29, 2008 Subject: Transmission Oil Leaking From Transmission Vent (Replace Transmission Case Cover (Channel Plate) Gasket) Models: 1997-2009 GM Passenger Cars and Light Duty Trucks (including Saturn) with Hydra-Matic 4T65-E Automatic Transmission (RPOs MN3, MN7, M15, M76) Supercede: This bulletin is being revised to add the 2008 and 2009 model years. Please discard Corporate Bulletin Number 01-07-30-032D (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak. Cause This condition may be caused by an improperly torqued channel plate gasket. Correction Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10356 To correct this condition, replace the case cover (channel plate) gaskets (429 and 430). Refer to Unit Repair publication in SI of the appropriate vehicle being serviced. Visual inspection of the upper gasket (1) will reveal damage at the referenced area. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Technical Service Bulletin # 06-07-30-016 Date: 060718 A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10357 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10358 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10359 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement Seals and Gaskets: Service and Repair Filler Tube and Seal Replacement (LM4) Filler Tube and Seal Replacement (LM4) Removal Procedure 1. Remove the transmission oil level indicator. 2. Raise and suitably support the vehicle. 3. Support the transmission using a suitable jack. 4. Remove the transmission crossmember. 5. Loosen the catalytic converter. 6. Lower the transmission slightly. 7. Remove the indicator tube nut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10362 8. Remove the oil level indicator tube. 9. Remove the seal from the transmission, if necessary. Installation Procedure 1. Install a NEW seal to the indicator tube. 2. Install the oil level indicator tube. 3. Install the indicator tube nut. Tighten the nut to 18 Nm (13 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Install the catalytic converter. 5. Install the transmission crossmember. 6. Remove the support from the transmission. 7. Lower the vehicle. 8. Install the transmission oil level indicator. 9. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. (LL8) Filler Tube and Seal Replacement (LL8) Removal Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10363 1. Remove the filler tube indicator. 2. Remove the nut (2) securing the filler tube to the secondary air injection reaction (AIR) stud (1). 3. Raise the vehicle. 4. Remove the catalytic converter heat shield. 5. Position a drain pan under the vehicle. 6. Remove the filler tube (1) and seal (2) from the vehicle. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10364 1. Install a new seal (2) into the transmission case. 2. Install the filler tube (1) into the seal. 3. Remove the drain pan. 4. Install the catalytic converter heat shield. 5. Tighten the heat shield to transmission bolts. Tighten the bolts to 17 Nm (13 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Install the nut (2) securing the filler tube to the secondary AIR stud (1). Tighten the nut to 10 Nm (89 inch lbs.). 7. Install the filler tube indicator. 8. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10365 Seals and Gaskets: Service and Repair Manual Shift Shaft Seal Replacement Manual Shift Shaft Seal Replacement Tools Required ^ J43911 Selector Shaft Seal Remover ^ J43909 Selector Shaft Seal Installer Removal Procedure 1. Raise the vehicle. 2. Remove the Park/Neutral Position (PNP) Switch. 3. Be sure that the jackscrew for J43911 is backed off and will not interfere with installation of the removal tool. Slide the seal remover tool over the selector shaft (2) with the threaded end of the tool towards the seal. 4. Rotate the removal tool so that the threads on the end of the tool engage the steel shell (1) of the seal. Use a wrench to be sure that the removal tool is firmly attached to the seal shell. 5. Rotate the jackscrew in the clockwise direction to remove the seal from the bore. Discard the seal that was removed. Installation Procedure 1. Carefully slide a new selector shaft seal (1) over the selector shaft (2) with the wide face of the steel case facing outward. Position the seal so that it is starting to enter the seal bore. 2. Obtain J43909 and remove the inner sleeve so that the tool will slide over the selector shaft. 3. Slide the J43909 into position so that the end of the tool contacts the seal being installed. Use a mallet to strike the J43909 and drive the new seal Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10366 into the seal bore until it is seated at the bottom of the bore. 4. Install the PNP Switch. 5. Lower the vehicle. 6. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10367 Seals and Gaskets: Service and Repair Accumulator Assembly, Spacer Plate, and Gaskets Accumulator Assembly, Spacer Plate, and Gaskets Tools Required ^ J25025-B Pump and Valve Body Alignment Pin Set ^ J36850 Transjel Lubricant Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and filter. 3. Remove the control valve body. Important: The 1-2 accumulator can be removed without removing the control valve assembly. 4. Remove the accumulator cover retaining bolts. 5. Remove the 1-2 accumulator cover assembly. 6. Disassemble the 1-2 accumulator. 1. Blow compressed air into the 1-2 accumulator cover, as shown, to remove the 1-2 accumulator piston. 2. Remove the 1-2 accumulator inner and outer springs. 7. Inspect the 1-2 accumulator inner and outer springs for cracks. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10368 8. Remove the 1-2 accumulator piston seal (1) from the 1-2 accumulator piston. 9. Inspect the 1-2 accumulator piston for the following defects: ^ Porosity ^ Cracks ^ Scoring ^ Nicks and scratches 10. Inspect the 1-2 accumulator cover for the following defects: ^ Porosity ^ Cracks ^ Scoring ^ Nicks and scratches 11. Remove the spacer plate support retaining bolts. 12. Remove the spacer plate support. Important: Use care not to drop the following items that will be removed along with the spacer plate: ^ The number 1 checkball ^ The 3-4 accumulator spring ^ The 3-4 accumulator pin 13. Remove the spacer plate to valve body gasket, the spacer plate and the spacer plate to transmission case gasket. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10369 14. Remove the 3-4 accumulator piston (2). 15. Inspect the 3-4 accumulator spring for cracks. 16. Remove the 3-4 accumulator piston seal (1) from the 3-4 accumulator piston. 17. Inspect the 3-4 accumulator piston for the following defects: ^ Porosity ^ Cracks ^ Scoring ^ Nicks and scratches Installation Procedure 1. Install a new 3-4 accumulator piston seal (1) to the 3-4 accumulator piston. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10370 2. Install the 3-4 accumulator pin (1) into the transmission case and retain the pin with J36850. 3. Install the 3-4 accumulator piston (2) onto the pin (1) in the transmission case. Ensure that the 3-4 accumulator piston legs face away from the transmission case. 4. Install the J25025-B (2, 3) to the transmission case. 5. Install the spacer plate to transmission case gasket and the spacer plate to valve body gasket to the spacer plate; use J36850 in order to retain the gaskets to the spacer plate. ^ The case gasket is identified by a C. Be sure to place the case gasket on the transmission case side of the spacer plate. ^ The valve body gasket is identified by a V. Be sure to place the valve body gasket on the valve body side of the spacer plate. 6. Ensure that the solenoid screens (1, 2) are in place on the spacer plate. 7. Place the checkball (3) on the spacer plate in the location shown. 8. Place the 3-4 accumulator spring (4) on the spacer plate. 9. Install the spacer plate and related components to the transmission. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10371 10. Install the spacer plate support and the spacer plate support retaining bolts. Tighten the spacer plate support retaining bolts to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 11. After installing the spacer plate support (2), look through the hole in the spacer plate to ensure that the checkball (1) has remained in the proper location. 12. Install a new 1-2 accumulator piston seal (1) to the 1-2 accumulator piston. 13. Install the 1-2 accumulator inner and outer springs to the 1-2 accumulator cover. 14. Install the 1-2 accumulator piston onto the pin in the 1-2 accumulator cover. Ensure that the piston legs face the accumulator cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10372 15. Install the 1-2 accumulator cover and the accumulator cover retaining bolts. Tighten the accumulator cover retaining bolts to 11 Nm (97 inch lbs.). 16. Remove the J25025-B from the transmission case. 17. Install the control valve body. 18. Install the transmission oil pan and filter. 19. Lower the vehicle. 20. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 21. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Seals and Gaskets, A/T > System Information > Service and Repair > Filler Tube and Seal Replacement > Page 10373 Seals and Gaskets: Service and Repair Transmission Extension Housing Rear Oil Seal Replacement Transmission Extension Housing Rear Oil Seal Replacement Tools Required ^ J21426 Extension Housing Seal Installer ^ J36850 Transmission Assembly Lubricant Removal Procedure 1. Raise the vehicle. 2. Place a drain pan under the vehicle. 3. Remove the propeller shaft. 4. Remove the case extension housing rear oil seal. Use a flat bladed tool and carefully pry the seal from the housing. 5. Inspect the case extension housing for damage. Replace the extension housing if necessary. Installation Procedure 1. Lubricate the inside diameter of the new seal with J36850. 2. Use the J21426 with a soft faced mallet to install the seal. 3. Install the seal to the extension housing. 4. Install the propeller shaft. 5. Remove the drain pan and lower the vehicle. 6. Fill the transmission to the proper level with DEXRON(r) III transmission fluid. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications TFP Manual Valve Position Switch Logic Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10378 Fluid Pressure Sensor/Switch: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10379 Fluid Pressure Sensor/Switch: Diagrams Automatic Transmission Inline 20-Way Connector End View Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10380 Fluid Pressure Sensor/Switch: Service and Repair Valve Body and Pressure Switch Replacement Removal Procedure 1. Ensure that removal of the valve body is necessary before proceeding. ^ Important: The following components can be serviced without removing the valve body from the transmission: The torque converter clutch solenoid (1) ^ The pressure control solenoid (2) ^ The internal wiring harness (3) ^ The 2-3 shift solenoid (4) ^ The 1-2 shift solenoid (5) ^ The transmission fluid pressure manual valve position switch (6) ^ The 3-2 shift solenoid (7) ^ The torque converter clutch pulse width modulation (TCC PWM) solenoid (8) 2. Remove the fluid level indicator. 3. Raise the vehicle. 4. Remove the oil pan, gasket, and filter. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10381 6. Remove the fluid indicator stop bracket bolt (2). 7. Remove the fluid indicator bracket (1). 8. Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible. 9. Remove the TCC PWM solenoid (1) in order to access the TCC solenoid retaining bolts. 10. Remove the TCC solenoid retaining bolts. 11. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body. 12. Reposition the harness to the side of the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10382 13. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. 14. Remove the transmission fluid pressure switch. 15. Inspect the transmission fluid pressure switch for damage or debris. 16. Remove the manual detent spring retaining bolt. 17. Remove the manual detent spring. 18. Inspect the manual detent spring for cracks or damage. 19. Remove the remaining control valve body bolts. Important: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10383 20. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. Installation Procedure Ball Check Valves 1. Install the checkballs (1-7) in the valve body. 2. Install the control valve body to the transmission case while simultaneously connecting the manual valve link to the manual valve. 3. Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2). 4. Install one bolt (M6 X 1.0 X 47.5) hand tight in the center (1) of the valve body to hold it in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10384 5. Do not install the transmission fluid indicator stop bracket and bolt at this time. Install but do not tighten the control valve body bolts which retain only the valve body directly. Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following: ^ M6 X 1.0 X 65.0 (1) ^ M6 X 1.0 X 54.4 (2) ^ M6 X 1.0 X 47.5 (3) ^ M6 X 1.0 X 35.0 (4) ^ M8 X 1.0 X 20.0 (5) ^ M6 X 1.0 X 12.0 (6) ^ M6 X 1.0 X 18.0 (7) Important: When installing bolts throughout this procedure, be sure to use the correct bolt size and length in the correct location as specified. 6. Install the manual detent spring. 7. Install but do not tighten the manual detent spring retaining bolt. 8. Install the transmission fluid pressure switch. 9. Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10385 10. Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows. Tighten the control valve body bolts (in sequence) to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation. 11. Ensure that the manual detent spring is aligned properly with the detent lever. Tighten the manual detent spring bolt to 31 Nm (23 ft. lbs.). 12. Install the TCC solenoid with a new O-ring seal to the valve body. 13. Install the TCC solenoid bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10386 Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). 14. Install the internal wiring harness to the valve body. The internal wiring harness has a tab (1) on the edge of the conduit. 15. Place the tab between the valve body and the pressure switch in the location shown (2). Press the harness into position on the valve body bolt bosses (1, 3). 16. Install the TCC PWM solenoid (1) to the control valve body. 17. Install the TCC PWM solenoid retainer (2). 18. Install the transmission fluid indicator stop bracket (1) and bolt (2). Tighten the transmission fluid indicator stop bracket bolt to 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 10387 19. Connect the internal wiring harness electrical connectors to the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) 20. Install the transmission oil pan and filter. 21. Lower the vehicle. 22. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 23. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10391 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10392 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10393 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10394 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Speed Sensor, A/T > Component Information > Locations Transmission Speed Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 10398 Vehicle Speed Sensor (VSS) 1 - VSS Sensor 2 - Transfer Case Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 10399 Transmission Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Input Speed Sensor (ISS) Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Sensors and Switches A/T > Transmission Temperature Sensor/Switch, A/T > Component Information > Specifications Transmission Fluid Temperature (TFT) Sensor Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Interlock, A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available Shift Interlock Solenoid: Technical Service Bulletins A/T - Shift Lock Control Actuator Available Bulletin No.: 05-07-129-001B Date: February 16, 2007 INFORMATION Subject: Automatic Transmission Shift Lock Control Actuator Available for Service Use Models: 2004-2007 Buick Rainier 2002-2007 Chevrolet TrailBlazer 2002-2006 Chevrolet TrailBlazer EXT 2003-2006 Chevrolet SSR 2002-2007 GMC Envoy 2002-2006 GMC Envoy XL 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada 2003-2007 HUMMER H2 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to update the model years and add the SSR. Please discard Corporate Bulletin Number 05-07-129-001A (Section 07 - Transmission/Transaxle). The automatic transmission shift lock control actuator is now available for service as a separate part. The actuator was formerly available only as part of the entire shifter assembly. DO NOT replace the shifter assembly if the shift lock control actuator requires replacement. Please refer to the Automatic Transmission Shift Lock Control Actuator Replacement procedure in the Automatic Transmission sub-section of the Service Information. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Interlock, A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available > Page 10408 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Interlock, A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 10409 Shift Interlock Solenoid: Locations Shift Lock Control Component Views Automatic Transmission Shift Lock Actuator 1 - Lower Console 2 - Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Interlock, A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 10410 Shift Interlock Solenoid: Diagrams Shift Lock Control Connector End Views Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Interlock, A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 10411 Shift Interlock Solenoid: Service and Repair Automatic Transmission Shift Lock Actuator Replacement Important: After assembling the shift lock actuator, turn the ignition forward but do not start (auxiliary position) and attempt to pull the lever from PARK with and without the brake pedal depressed to verify there is no gear access without the brake pedal depressed. Important: Ensure the key cannot be removed from the ignition unless both the shiftier is in PARK and the shift knob button has been depressed. Removal Procedure 1. Remove the console. 2. Disconnect the shift lock actuator (3) electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Interlock, A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 10412 3. Shift assembly to the LOW position. 4. Loosen and remove the screw at the rear of the shiftier assembly. 5. Shift the assembly to the NEUTRAL position. 6. Loosen and remove the top screw of the shift lock actuator through the lever slot. 7. Pull lever to the DRIVE position and remove the shift lock actuator. Installation Procedure 1. In DRIVE position, depress the shift lock actuator button and realign into the shiftier lever. 2. Push lever to NEUTRAL. 3. Install the top screw through the lever slot. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Shift lever to LOW. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Interlock, A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 10413 5. Install the screw at the rear of the shiftier assembly. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). 6. Connect the electrical connector (3). 7. Verify the shift lock actuator functions properly. 8. Install the console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Specifications Shift Solenoid Valve State and Gear Ratio Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Specifications > Page 10417 Shift Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Shift Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10420 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10421 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10422 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10423 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10424 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10425 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10426 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10427 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10428 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10429 Shift Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10430 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10431 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10432 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10433 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10434 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10435 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10436 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10437 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10438 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10439 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10440 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10441 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10442 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10443 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10444 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10445 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10446 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10447 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10448 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10449 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10450 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10451 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10452 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10453 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10454 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10455 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10456 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10457 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10458 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10459 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10460 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10461 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10462 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10463 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10464 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10465 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10466 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10467 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10468 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10469 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10470 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10471 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10472 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10473 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10474 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10475 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10476 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10477 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10478 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10479 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10480 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10481 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10482 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10483 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10484 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10485 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10486 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10487 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10488 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10489 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10490 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10491 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10492 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10493 Shift Solenoid: Connector Views Automatic Transmission Internal Connector End Views 1-2 Shift Solenoid (SS) Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10494 2-3 Shift Solenoid (SS) Valve, Wiring Harness Side 3-2 Shift Solenoid (SS) Valve Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Page 10495 Shift Solenoid: Service and Repair Control and Shift Solenoids Replacement Removal Procedure 1. Remove the transmission oil pan and filter. 2. Remove the 1-2 accumulator if necessary. Important: Do not remove the valve body for the following procedures. Removal of the 1-2 accumulator is necessary only if servicing the pressure control solenoid. 3. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 4. Remove the pressure control solenoid retainer. 5. Remove the pressure control solenoid. 6. Remove the 1-2 and 2-3 shift solenoid retainers. 7. Remove the 1-2 and 2-3 shift solenoids. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Page 10496 8. Remove the 3-2 control solenoid retainer. 9. Remove the 3-2 control solenoid. Installation Procedure 1. Install the 3-2 control solenoid. 2. Install the 3-2 control solenoid retainer. 3. Install the 1-2 and 2-3 shift solenoids. 4. Install the 1-2 and 2-3 shift solenoid retainers. 5. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Solenoid, A/T > Component Information > Diagrams > Page 10497 Notice: Refer to Fastener Notice in Service Precautions. 6. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 7. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 8. Install the 1-2 accumulator. 9. Install the transmission oil pan and filter. 10. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 11. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shifter A/T > Component Information > Service and Repair Shifter A/T: Service and Repair Floor Shift Control Knob Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Automatic Transmission Shift Boot > Component Information > Technical Service Bulletins > Customer Interest for Automatic Transmission Shift Boot: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Automatic Transmission Shift Boot: Customer Interest A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Automatic Transmission Shift Boot > Component Information > Technical Service Bulletins > Customer Interest for Automatic Transmission Shift Boot: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 10510 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Automatic Transmission Shift Boot > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Automatic Transmission Shift Boot: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder Automatic Transmission Shift Boot: All Technical Service Bulletins A/T - Key Will Not Release From Ignition Lock Cylinder Bulletin No.: 05-07-30-021B Date: October 04, 2007 TECHNICAL Subject: Ignition Key Will Not Remove From Ignition Lock Cylinder (Reposition Shifter Boot) Models: 2004-2007 Buick Rainier 2002-2008 Chevrolet TrailBlazer Models 2002-2008 GMC Envoy Models 2003-2004 Oldsmobile Bravada Supercede: This bulletin is being revised to include the 2008 model year. Please discard Corporate Bulletin Number 05-07-30-021A (Section 07 - Transmission/Transaxle). Condition Some customers may comment that they are unable to remove the ignition key from the ignition cylinder. Cause The shifter boot may be caught/trapped in the shifter assembly mechanism. Correction Inspect the shifter boot for being caught/trapped in the shifter assembly. If the shifter boot is NOT caught/trapped in the shift assembly, refer to Ignition Key Cannot Be Removed from the Ignition Lock Cylinder in SI. If the shifter boot IS caught/trapped in the shifter assembly, continue with the next step. DO NOT replace the complete shifter assembly for this condition. ONLY replace the shifter boot/handle if damaged by shifter assembly. Reposition the shifter boot so that it is not caught/trapped in the shifter assembly. Warranty Information Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Automatic Transmission Shift Boot > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Automatic Transmission Shift Boot: > 05-07-30-021B > Oct > 07 > A/T - Key Will Not Release From Ignition Lock Cylinder > Page 10516 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Shift Cable, A/T > Component Information > Adjustments Shift Cable: Adjustments Automatic Transmission Range Selector Cable Adjustment Adjustment Procedure 1. Ensure that the range selector cable is not restricted. 2. Ensure that the floor shift control is in the PARK position. 3. Raise the vehicle. 4. Disconnect the range selector cable (4) from the range selector lever ball stud (6). 5. Ensure that the range selector lever is in the mechanical PARK position. (Rotate the range selector lever fully clockwise). 6. Release the locking tab (1) 7. Slide the secondary lock cover (1) to the side 8. Carefully squeeze the locking tabs (2) together to disengage the primary lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Shift Cable, A/T > Component Information > Adjustments > Page 10520 9. Pull the primary lock (1) up. Spring tension will push the end of the cable past the ball stud. 10. Push the end of the cable until it is aligned with the ball stud. Important: If the cable end is pushed rearward past the ball stud during the adjustment procedure, it must be released and allowed to come forward of the ball stud. The cable end must then be pushed back just enough to be installed to the ball stud. 11. Install the cable (4) to the ball stud (6). 12. Seat the primary lock (1) by pressing into the locked position. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Shift Cable, A/T > Component Information > Adjustments > Page 10521 13. Slide the secondary lock (1) over the primary lock. 14. Be sure that the secondary lock tab (1) is securely in place. 15. Lower the vehicle. 16. Check the vehicle for proper operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Shift Cable, A/T > Component Information > Service and Repair > Automatic Transmission Range Selector Cable Replacement Shift Cable: Service and Repair Automatic Transmission Range Selector Cable Replacement Automatic Transmission Range Selector Cable Replacement Removal Procedure 1. Ensure that the vehicle is in the park position. 2. Raise the vehicle. 3. Remove the end of the range selector cable from the transmission range selector lever ball stud (6). 4. Remove the retainer (5) from the range selector cable. 5. Remove the range selector cable (4) from the bracket (1). 6. Remove the cable from the retainer (3) on the floor panel. If the vehicle is equipped with 4WD, remove the cable from the retainers located on the transfer case. 7. Push the cable grommet (2) up through the floor panel. 8. Lower the vehicle. 9. Remove the console. 10. Remove the drivers side front mat and carpet. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Shift Cable, A/T > Component Information > Service and Repair > Automatic Transmission Range Selector Cable Replacement > Page 10524 11. Remove the end of the range selector cable (1) from the floor control ball stud. 12. Remove the range selector cable (2) from the floor shift control assembly. 13. Remove the tape and grommet on the shift cable from the floor panel. 14. Remove the range selector cable (3) from the vehicle. Installation Procedure 1. Push the cable down through the floor panel and install the grommet (2). 2. Install the range selector cable (2) to the floor shift control assembly. 3. Install the end of the range selector cable (1) to floor control ball stud. 4. Install the drivers side front mat and carpet. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Shift Cable, A/T > Component Information > Service and Repair > Automatic Transmission Range Selector Cable Replacement > Page 10525 5. Install the console. 6. Raise the vehicle. 7. Install the cable to the retainer (3) on the floor panel. If the vehicle is equipped with 4WD, install the cable to the retainers located on the transfer case. 8. Install the range selector cable (4) to the bracket (1). 9. Install the retainer (5) to the range selector cable. 10. Install the end of the range selector cable to the transmission range selector lever ball stud (6). 11. Adjust the range selector cable. 12. Lower the vehicle and check for proper operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Shift Linkage, A/T > Shift Cable, A/T > Component Information > Service and Repair > Automatic Transmission Range Selector Cable Replacement > Page 10526 Shift Cable: Service and Repair Automatic Transmission Range Selector Cable Bracket Replacement Automatic Transmission Range Selector Cable Bracket Replacement Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Disconnect the transmission range selector cable from the shift lever and the bracket (2). 5. Remove the bolts (1) securing the transmission range selector cable bracket (2) to the transmission. 6. Remove the transmission range selector cable bracket from the vehicle. Installation Procedure 1. Install the transmission range selector cable bracket to the vehicle. 2. Install the transmission range selector cable bracket bolts (1). Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 3. Install the transmission range selector cable to the bracket (2) and the lever. 4. Lower the vehicle. 5. Check the vehicle for proper operation. If adjustment of the cable is necessary, refer to Automatic Transmission Range Selector Cable Adjustment. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-017A > Aug > 06 > A/T 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise Torque Converter: Customer Interest A/T - 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise Bulletin No.: 06-07-30-017A Date: August 16, 2006 TECHNICAL Subject: 4L60-E, 4L65-E, 4L70-E Automatic Transmission High Pitched Whine, Whistle, Chirp or Buzz Type Noise at 1,500-1,800 RPM (Replace with Updated Torque Converter) Models: 2005-2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2005 Chevrolet Corvette 2005-2006 Chevrolet Silverado, Silverado SS, SSR 2006 Chevrolet TrailBlazer SS 2005-2006 GMC Sierra, Sierra Denali, Yukon Denali, Yukon Denali XL 2005-2006 Pontiac GTO 2005-2006 HUMMER H2, H2 SUT with 4L65-E, 4L70-E Automatic Transmission (RPOs M32 or M70) 2007 Chevrolet Avalanche, Suburban, Tahoe 2007 GMC Yukon, Yukon XL with 4L60-E Automatic Transmission (RPO M30) Supercede: This bulletin is being revised to update Transmission RPO usage information in the Parts table. Please discard Corporate Bulletin Number 06-07-30-017 (Section 07 - Automatic Transmission). Condition Some customers may comment on a high pitched whistle or whine type noise at approximately 1,500-1,800 rpm while in any forward gear with the torque converter clutch (TCC) disengaged. This noise is typically easier to duplicate when driving up a slight grade when accelerating. This noise will stop when the TCC is engaged. Some 2007 vehicles have been reported to exhibit this noise in 1st gear at approximately 16 km/h (10 mph) with 30-50% TPS on a launch from a stop. Cause The torque converter pump blade may cause this condition. A torque converter pump blade revision is expected in production by the end of July, 2006. Correction To determine the location of the noise, use the chassis ears with a small acoustic clip-on microphone (such as Radio Shack P/N 33-3013) plugged into the chassis ear amplifier. Drive the vehicle to duplicate the concern using the chassis ears and the Tech 2 to apply and release the TCC. If the noise is coming from the bell housing area only, when the TCC is commanded off, replace the torque converter. If the noise is present with the TCC commanded on, this noise is not caused by the torque converter and torque converter replacement will not correct the condition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-017A > Aug > 06 > A/T 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise > Page 10535 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-017A > Aug > 06 > A/T 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise > Page 10536 Parts Information Warranty Information For vehicles repaired under warranty, use the table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-017A > Aug > 06 > A/T 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise > Page 10537 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Torque Converter: Customer Interest A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10542 Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10543 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10544 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 01-07-30-010C > May > 08 > A/T - Torque Converter Replacement Information Torque Converter: All Technical Service Bulletins A/T - Torque Converter Replacement Information INFORMATION Bulletin No.: 01-07-30-010C Date: May 12, 2008 Subject: Automatic Transmission/Transaxle Torque Converter Replacement Models: 2009 and Prior GM Passenger Cars and Trucks 2009 and Prior HUMMER H2, H3 2009 and Prior Saturn Cars and Light Duty Trucks (Except VTi Equipped Vehicles (RPO M16 and M75) 2009 and Prior Saab 9-7X with ALL Automatic Transmissions and Transaxles Supercede: This bulletin is being revised to add the 2007-2009 model years. Please discard Corporate Bulletin Number 01-07-30-010B (Section 07 - Transmission/Transaxle). The purpose of this bulletin is to help technicians determine when a torque converter should be replaced. Below is a list of general guidelines to follow. The converter should NOT be replaced if the following apply: ^ DTC P0742 - TCC stuck on is set. This code is almost always the result of a controls condition (i.e. stuck TCC solenoid/valve). Experience has shown that this code rarely indicates a mechanical concern within the torque converter. ^ The fluid has an odor or is discolored but no evidence of metal contamination. ^ Fine metal particles (traces of metal flakes/gray color to fluid ) are found in the converter. This is not harmful to the torque converter. ^ The vehicle has been exposed to high mileage. ^ A small amount of wear appears on the hub where the oil pump drive gear mates to the converter (RWD only). A certain amount of such wear is normal for both the hub and oil pump gear. Neither the converter nor the front pump assembly should be replaced. The torque converter should be replaced under any of the following conditions: ^ The vehicle has TCC shudder and/or no TCC apply. First complete all electrical and hydraulic diagnosis and check for proper engine operation. The converter clutch may be damaged. Also the converter bushing and/or internal 0-ring may be damaged. ^ Evidence of damage to the oil pump assembly pump shaft turbine shaft drive sprocket support and bearing or metal chips/debris in the converter. ^ Metal chips/debris are found in the converter or when flushing the cooler and the cooler lines. ^ External leaks in the hub weld area lug weld or closure weld. ^ Converter pilot is broken damaged or fits poorly into the crankshaft. ^ The converter hub is scored or damaged. ^ The transmission oil is contaminated with engine coolant engine oil or water. ^ If excessive end play is found after measuring the converter for proper end play (refer to Service Manual). ^ If metal chips/debris are found in the fluid filter or on the magnet and no internal parts in the unit are worn or damaged. This indicates that the material came from the converter. ^ The converter has an unbalanced condition that results in a vibration that cannot be corrected by following Converter Vibration Procedures. ^ Blue converter or dark circular ring between lugs. This condition will also require a complete cleaning of the cooler and a check for adequate flow Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 01-07-30-010C > May > 08 > A/T - Torque Converter Replacement Information > Page 10550 through the cooler. ^ Converter bearing noise determined by noise from the bell housing area in Drive or Reverse at idle. The noise is gone in Neutral and Park. ^ If silicon from the viscous clutch is found in the lower pan (4T80-E ONLY). Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-017A > Aug > 06 > A/T - 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise Torque Converter: All Technical Service Bulletins A/T - 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise Bulletin No.: 06-07-30-017A Date: August 16, 2006 TECHNICAL Subject: 4L60-E, 4L65-E, 4L70-E Automatic Transmission High Pitched Whine, Whistle, Chirp or Buzz Type Noise at 1,500-1,800 RPM (Replace with Updated Torque Converter) Models: 2005-2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2005 Chevrolet Corvette 2005-2006 Chevrolet Silverado, Silverado SS, SSR 2006 Chevrolet TrailBlazer SS 2005-2006 GMC Sierra, Sierra Denali, Yukon Denali, Yukon Denali XL 2005-2006 Pontiac GTO 2005-2006 HUMMER H2, H2 SUT with 4L65-E, 4L70-E Automatic Transmission (RPOs M32 or M70) 2007 Chevrolet Avalanche, Suburban, Tahoe 2007 GMC Yukon, Yukon XL with 4L60-E Automatic Transmission (RPO M30) Supercede: This bulletin is being revised to update Transmission RPO usage information in the Parts table. Please discard Corporate Bulletin Number 06-07-30-017 (Section 07 - Automatic Transmission). Condition Some customers may comment on a high pitched whistle or whine type noise at approximately 1,500-1,800 rpm while in any forward gear with the torque converter clutch (TCC) disengaged. This noise is typically easier to duplicate when driving up a slight grade when accelerating. This noise will stop when the TCC is engaged. Some 2007 vehicles have been reported to exhibit this noise in 1st gear at approximately 16 km/h (10 mph) with 30-50% TPS on a launch from a stop. Cause The torque converter pump blade may cause this condition. A torque converter pump blade revision is expected in production by the end of July, 2006. Correction To determine the location of the noise, use the chassis ears with a small acoustic clip-on microphone (such as Radio Shack P/N 33-3013) plugged into the chassis ear amplifier. Drive the vehicle to duplicate the concern using the chassis ears and the Tech 2 to apply and release the TCC. If the noise is coming from the bell housing area only, when the TCC is commanded off, replace the torque converter. If the noise is present with the TCC commanded on, this noise is not caused by the torque converter and torque converter replacement will not correct the condition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-017A > Aug > 06 > A/T - 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise > Page 10555 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-017A > Aug > 06 > A/T - 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise > Page 10556 Parts Information Warranty Information For vehicles repaired under warranty, use the table. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-017A > Aug > 06 > A/T - 4L60-E/4L65-E/4L70-E Whine/Whistle/Chirp Noise > Page 10557 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Torque Converter: All Technical Service Bulletins A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area Bulletin No.: 06-07-30-016 Date: July 18, 2006 TECHNICAL Subject: 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) Models: 2006 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer 2006-2007 Chevrolet Avalanche, Suburban, Tahoe 2006 GMC Canyon, Envoy, Savana, Sierra 2006-2007 GMC Yukon 2007 GMC Yukon XL 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) Condition Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing. Cause Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots. Correction Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10562 Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern. The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss. Parts Information Warranty Information (excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10563 For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter: > 06-07-30-016 > Jul > 06 > A/T - 4L60-E, 4L65-E Fluid Leak From Bell Housing Area > Page 10564 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Other Service Bulletins for Torque Converter: > 01-07-30-010C > May > 08 > A/T - Torque Converter Replacement Information Torque Converter: All Technical Service Bulletins A/T - Torque Converter Replacement Information INFORMATION Bulletin No.: 01-07-30-010C Date: May 12, 2008 Subject: Automatic Transmission/Transaxle Torque Converter Replacement Models: 2009 and Prior GM Passenger Cars and Trucks 2009 and Prior HUMMER H2, H3 2009 and Prior Saturn Cars and Light Duty Trucks (Except VTi Equipped Vehicles (RPO M16 and M75) 2009 and Prior Saab 9-7X with ALL Automatic Transmissions and Transaxles Supercede: This bulletin is being revised to add the 2007-2009 model years. Please discard Corporate Bulletin Number 01-07-30-010B (Section 07 - Transmission/Transaxle). The purpose of this bulletin is to help technicians determine when a torque converter should be replaced. Below is a list of general guidelines to follow. The converter should NOT be replaced if the following apply: ^ DTC P0742 - TCC stuck on is set. This code is almost always the result of a controls condition (i.e. stuck TCC solenoid/valve). Experience has shown that this code rarely indicates a mechanical concern within the torque converter. ^ The fluid has an odor or is discolored but no evidence of metal contamination. ^ Fine metal particles (traces of metal flakes/gray color to fluid ) are found in the converter. This is not harmful to the torque converter. ^ The vehicle has been exposed to high mileage. ^ A small amount of wear appears on the hub where the oil pump drive gear mates to the converter (RWD only). A certain amount of such wear is normal for both the hub and oil pump gear. Neither the converter nor the front pump assembly should be replaced. The torque converter should be replaced under any of the following conditions: ^ The vehicle has TCC shudder and/or no TCC apply. First complete all electrical and hydraulic diagnosis and check for proper engine operation. The converter clutch may be damaged. Also the converter bushing and/or internal 0-ring may be damaged. ^ Evidence of damage to the oil pump assembly pump shaft turbine shaft drive sprocket support and bearing or metal chips/debris in the converter. ^ Metal chips/debris are found in the converter or when flushing the cooler and the cooler lines. ^ External leaks in the hub weld area lug weld or closure weld. ^ Converter pilot is broken damaged or fits poorly into the crankshaft. ^ The converter hub is scored or damaged. ^ The transmission oil is contaminated with engine coolant engine oil or water. ^ If excessive end play is found after measuring the converter for proper end play (refer to Service Manual). ^ If metal chips/debris are found in the fluid filter or on the magnet and no internal parts in the unit are worn or damaged. This indicates that the material came from the converter. ^ The converter has an unbalanced condition that results in a vibration that cannot be corrected by following Converter Vibration Procedures. ^ Blue converter or dark circular ring between lugs. This condition will also require a complete cleaning of the cooler and a check for adequate flow Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter > Component Information > Technical Service Bulletins > All Other Service Bulletins for Torque Converter: > 01-07-30-010C > May > 08 > A/T - Torque Converter Replacement Information > Page 10570 through the cooler. ^ Converter bearing noise determined by noise from the bell housing area in Drive or Reverse at idle. The noise is gone in Neutral and Park. ^ If silicon from the viscous clutch is found in the lower pan (4T80-E ONLY). Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Check Valve > Component Information > Technical Service Bulletins > A/T - Revised Converter Check Valve/Cooler Line Fitting Torque Converter Check Valve: Technical Service Bulletins A/T - Revised Converter Check Valve/Cooler Line Fitting INFORMATION Bulletin No.: 04-07-30-017B Date: November 25, 2008 Subject: Information on 4T65-E MN7, M15, M76, MN3 Automatic Transmission Case, Cooler Fitting and Torque Converter Drain Back Check Ball Change Models: 2008 and Prior GM Passenger Cars and Light Duty Trucks with one of the HYDRA-MATIC(R) Automatic Transmissions shown above. Supercede: This bulletin is being revised to update the Parts Information. Please discard Corporate Bulletin Number 04-07-30-017A (Section 07 - Transmission/Transaxle). Effective with Julian date 4019 (January 19, 2004), the 4T65E transaxle cases and cooler fittings have changed and are not interchangeable with past models. The technician may find that when replacing the inlet or outlet transmission cooler lines, the new lines cannot be connected to the transmission. A change to the transmission cooler line fittings was implemented in production on February 1, 2004. The cooler line fittings were changed to a design with a longer lead in pilot (1). The cooler line fittings with the longer lead in pilot will not fit on models built before February 1, 2004. The longer lead in pilot fittings (1) (9/16-18 UNF) have replaced the shorter lead in pilot fittings (2) (3/8-18 NPSF w/check ball & 1/4-18 NPSF). If the transmission cooler lines will not connect, then replace them with the following cooler line fittings as appropriate with the older, shorter lead in pilot design: ^ For vehicles built prior to February 1, 2004, use Transmission Fluid Cooler Inlet Hose, P/N 20793004. ^ For vehicles built after February 1, 2004, use Transmission Fluid Cooler Inlet Hose, second design P/N 15264588. ^ For vehicles built prior to February 1, 2004, use Transmission Fluid Cooler Outlet Hose, P/N 20793005. ^ For vehicles built after February 1, 2004, use Transmission Fluid Cooler Outlet Hose, second design P/N 15264589. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Check Valve > Component Information > Technical Service Bulletins > A/T - Revised Converter Check Valve/Cooler Line Fitting > Page 10575 The torque specification has changed for the fittings to case. The torque has changed from 38 Nm (28 lb ft) to 32 Nm (23 lb ft). Tighten Tighten the new cooler fittings to 32 Nm (23 lb ft). The converter drain back check ball (420C) has been removed from the cooler line fitting and is now located in the channel plate. If you get a concern of no movement in the morning or after sitting for several hours, the cooler check ball should be inspected. The best way to determine where the check ball is located is to look at the cooler line fittings. The old fittings are different sizes (3/8-18 NPSF & 1/4-18 NPSF) and would contain the cooler check ball. The new fittings are the same size as each other (9/16-18 UNF) and do not have a cooler check ball. Parts Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch, A/T > Component Information > Technical Service Bulletins > Customer Interest for Torque Converter Clutch: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Torque Converter Clutch: Customer Interest A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Bulletin No.: 06-07-30-007A Date: February 20, 2007 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) On, Diagnostic Trouble Code (DTC) P0894, Harsh 1-2 Shift with 4L60-E, 4L65-E, 4L70-E Automatic Transmission (Test and Replace Torque Converter Clutch (TCC) Enable Solenoid/Harness, Auto Trans Wiring) Models: 2006 Cadillac Escalade Models 2006 Chevrolet Light Duty Trucks 2006 Chevrolet Express Vans 2006 GMC Light Duty Trucks 2006 GMC Savana Vans 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E / 4L65-E / 4L70-E (RPOs M30, M32, M70) Automatic Transmission Supercede: This bulletin is being revised to add part number for vehicles with Input Speed Sensor (ISS). Please discard Corporate Bulletin Number 06-07-30-007 (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a harsh 1-2 shift with the MIL illuminated. Diagnosis with a scan tool may reveal a DTC P0894. Cause This condition may be caused by a leaking TCC enable solenoid. The TCC enable solenoid is part of the automatic transmission wiring harness. Correction Follow the diagnosis and repair procedure below for a DTC P0894. With a scan tool, verify the presence of DTC P0894. Remove the TCC Enable solenoid / automatic transmission wiring harness. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch, A/T > Component Information > Technical Service Bulletins > Customer Interest for Torque Converter Clutch: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10584 Typically if the TCC enable solenoid is found to have a crack/fracture (2), it will be located parallel to the mold seam (1) as shown above. Engineering investigation shows that TCC enable solenoids that are brown in color may exhibit the cracking / fracture condition. Engineering investigation shows that TCC enable solenoids that are off-white in color do not exhibit the cracking / fracture condition. Air check the TCC enable solenoid using J 44246 solenoid testing kit. Install the TCC enable solenoid into bore # 2 of J 44246 as shown above. While air is being applied to the solenoid through J 44246, coat the outside of the solenoid body with transmission fluid to help expose a possible vertical crack in the molded part of the solenoid body. This crack may be very small and not visible without the use of ATF. Complete instructions for the Shift Solenoid Leak Test can be found in SI Document ID # 856531. If NO visual leaks are found in the TCC enable solenoid, refer to DTC P0894 in the appropriate SI Document. If visual leaks are found in the TCC enable solenoid, continue with the next step. Replace the TCC enable solenoid. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Road test the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch, A/T > Component Information > Technical Service Bulletins > Customer Interest for Torque Converter Clutch: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10585 Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter Clutch: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Torque Converter Clutch: All Technical Service Bulletins A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Bulletin No.: 06-07-30-007A Date: February 20, 2007 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) On, Diagnostic Trouble Code (DTC) P0894, Harsh 1-2 Shift with 4L60-E, 4L65-E, 4L70-E Automatic Transmission (Test and Replace Torque Converter Clutch (TCC) Enable Solenoid/Harness, Auto Trans Wiring) Models: 2006 Cadillac Escalade Models 2006 Chevrolet Light Duty Trucks 2006 Chevrolet Express Vans 2006 GMC Light Duty Trucks 2006 GMC Savana Vans 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E / 4L65-E / 4L70-E (RPOs M30, M32, M70) Automatic Transmission Supercede: This bulletin is being revised to add part number for vehicles with Input Speed Sensor (ISS). Please discard Corporate Bulletin Number 06-07-30-007 (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a harsh 1-2 shift with the MIL illuminated. Diagnosis with a scan tool may reveal a DTC P0894. Cause This condition may be caused by a leaking TCC enable solenoid. The TCC enable solenoid is part of the automatic transmission wiring harness. Correction Follow the diagnosis and repair procedure below for a DTC P0894. With a scan tool, verify the presence of DTC P0894. Remove the TCC Enable solenoid / automatic transmission wiring harness. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter Clutch: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10591 Typically if the TCC enable solenoid is found to have a crack/fracture (2), it will be located parallel to the mold seam (1) as shown above. Engineering investigation shows that TCC enable solenoids that are brown in color may exhibit the cracking / fracture condition. Engineering investigation shows that TCC enable solenoids that are off-white in color do not exhibit the cracking / fracture condition. Air check the TCC enable solenoid using J 44246 solenoid testing kit. Install the TCC enable solenoid into bore # 2 of J 44246 as shown above. While air is being applied to the solenoid through J 44246, coat the outside of the solenoid body with transmission fluid to help expose a possible vertical crack in the molded part of the solenoid body. This crack may be very small and not visible without the use of ATF. Complete instructions for the Shift Solenoid Leak Test can be found in SI Document ID # 856531. If NO visual leaks are found in the TCC enable solenoid, refer to DTC P0894 in the appropriate SI Document. If visual leaks are found in the TCC enable solenoid, continue with the next step. Replace the TCC enable solenoid. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Road test the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Torque Converter Clutch: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10592 Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Locations Torque Converter Clutch Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Torque Converter Clutch Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10598 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10599 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10600 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10601 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10602 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10603 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10604 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10605 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10606 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10607 Torque Converter Clutch Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10608 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10609 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10610 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10611 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10612 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10613 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10614 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10615 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10616 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10617 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10618 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10619 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10620 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10621 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10622 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10623 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10624 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10625 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10626 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10627 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10628 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10629 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10630 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10631 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10632 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10633 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10634 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10635 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10636 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10637 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10638 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10639 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10640 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10641 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10642 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10643 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10644 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10645 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10646 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10647 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10648 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10649 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10650 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10651 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10652 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10653 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10654 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10655 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10656 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10657 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10658 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10659 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10660 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10661 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10662 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10663 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10664 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10665 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10666 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10667 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10668 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10669 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10670 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10671 Torque Converter Clutch Solenoid: Connector Views Automatic Transmission Inline 20-Way Connector End View Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 10672 Torque Converter Clutch (TCC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10673 Torque Converter Clutch Solenoid: Service and Repair Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness Tools Required ^ J28458 Seal Protector Retainer Installer Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and the filter. 3. Disconnect the transmission harness 20-way connector from the transmission internal harness pass-through connector. Depress both tabs on the connector and pull straight up; do not pry the connector. 4. Remove the 1-2 accumulator assembly. Do not remove the spacer plate. Important: Removal of the valve body is not necessary for the following procedure. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10674 6. Remove the TCC PWM solenoid retainer. 7. Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts. 8. Remove the pressure control solenoid retainer. 9. Remove the pressure control solenoid. 10. Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness. 11. Using J28458, release the pass-through electrical connector from the transmission case. 1. Use the small end of the J28458 over the top of the connector. 2. Twist in order to release the four tabs retaining the connector. 3. Pull the harness connector down through the transmission case. 12. Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10675 13. Inspect the TCC solenoid and wiring harness assembly for the following defects: ^ Damage ^ Cracked connectors ^ Exposed wires ^ Loose pins Installation Procedure 1. Install the wiring harness and TCC solenoid assembly with a new O-ring seal to the transmission. 2. Install the pass-through electrical connector to the transmission case. 3. Install the valve body bolts which retain the internal wiring harness and install the TCC solenoid retaining bolts. ^ Tighten the control valve body retaining bolts to 11 Nm (97 inch lbs.). ^ Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10676 4. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. 5. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 6. Install the TCC PWM solenoid to the control valve body. 7. Install the TCC PWM solenoid retainer. 8. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 9. Install the 1-2 accumulator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 10677 10. Connect the transmission harness 20-way connector to the transmission pass-through connector. Align the arrows on each half of the connector and insert straight down. 11. Install the transmission oil pan and filter. 12. Lower the vehicle. 13. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 14. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Cooler, A/T > Component Information > Technical Service Bulletins > A/T - Fluid Oil Cooler Flush Transmission Cooler: Technical Service Bulletins A/T - Fluid Oil Cooler Flush INFORMATION Bulletin No.: 02-07-30-052G Date: March 02, 2011 Subject: Automatic Transmission Oil Cooler Flush and Flow Test Essential Tool J 45096 TransFlow(R) Models: 2011 and Prior Passenger Cars and Light Duty Trucks 2003-2010 HUMMER H2 2006-2010 HUMMER H3 with Automatic Transmission/Transaxle including Allison(R) Transmissions Supercede: This bulletin is being revised to update the model years. Please discard Corporate Bulletin Number 02-07-30-052F (Section 07 - Transmission/Transaxle). Important All labor operations that include removal of the transmission from the vehicle include labor time to flush the transmission oil cooler system. The J 45096 transmission oil cooling system flush and flow test tool replaces current tool J 35944-A. J 45096 is a self-contained unit utilizing a 12-volt flow meter, shop air supply and DEXRON(R) VI automatic transmission fluid (ATF). In the flush mode, transmission fluid is cycled through the transmission oil cooling system. High-pressure air is automatically injected into the fluid stream adding agitation to the ATF oil to enhance the removal of contaminated ATF oil and debris. In the flow mode, an electronic flow meter is used to measure the flow capability of the ATF oil cooling system. A digital display indicates the ATF oil flow rate in gallons per minute (GPM) along with the amount of ATF oil in the supply vessel, supply vessel ATF oil temperature, machine cycles and the operating mode. The supply oil vessel has 30 L (32 qt) capacity and the waste oil vessel has 32 L (34 qt) capacity. The waste oil vessel is constructed of a translucent composite material that allows the user to easily identify the oil level. The waste oil vessel can accommodate vacuum evacuation and gravity draining. In the code mode, a random, encrypted code is generated that can be used for verification of flow test results. Current essential cooler line adapters are used to connect the J 45096 to the automatic transmission oil cooler lines that allows J 45096 to adapt to General Motors passenger cars and light duty trucks, current and past models (except the Pontiac Vibe, Wave and Chevrolet Aveo). The tool may be adapted for use on the Pontiac Vibe, Wave and Chevrolet Aveo by dealership personnel with a barbed hose connector and rubber hose obtained locally. The Vibe's/Wave's/Aveo's transmission has a transmission oil requirement which is slightly different than DEXRON(R) VI ATF. However, flushing the cooler with DEXRON(R) VI automatic transmission fluid is an acceptable service procedure. Very little fluid remains in the cooler after the flush procedure and the residual DEXRON(R) VI ATF in the cooler is compatible with the Vibe's/Wave's/Aveo's transmission fluid. Notice Insufficient oil flow through the ATF oil cooling system will cause premature transmission failure. The required minimum ATF oil flow rate reading is directly related to the supply oil temperature. Refer to the flow rate reference chart for the oil flow rate specification based on the temperature of the ATF in the supply vessel. Helpful Hints for Maintaining the Temperature at or above 18°C (65°F) Important - The temperature of the supply vessel oil must be 18°C (65°F) or greater for J 45096 to operate. It is recommended to store the J 45096 in an area of the dealership where the room temperature remains at or above 18°C (65°F) when not in use. - Do not attempt to increase the fluid temperature in the Transflow(R) machine with an engine oil dipstick, or any other immersion type heater. The Transflow(R) machine has a check valve in the supply reservoir. Inserting a heater will damage the check valve and the subsequent repair expense would be the dealer's responsibility. - A heater blanket, P/N J-45096-10, is available for the Transflow(R) transmission cooling system flushing tool. This heater fastens around the Transflow(R) internal supply vessel and runs on 110 volts AC. The heater will warm the ATF in the supply vessel to at least 18°C (65° F) and has a thermostat to hold a constant temperature. Store the Transmission Cooling System Service Tool, J 45096, Transflow(R) machine in a room where the temperature is maintained at or above 18°C (65°F). Keep the ATF level in the reservoir low when the Transmission Cooling System Service Tool, J 45096, Transflow(R), is not in use. Store several gallons of oil in an area where the temperature is maintained at or above 18°C (65°F). Fill the reservoir of the J 45096 as needed before using the machine on Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Cooler, A/T > Component Information > Technical Service Bulletins > A/T - Fluid Oil Cooler Flush > Page 10682 each repair. With the ATF in a tightly sealed container, place the container in a tub of hot water for a period of time. Then pour the ATF into the reservoir. This method works best with a low fluid level in the reservoir. Place the Transflow(R) machine in the direct sunlight with the cabinet door open to expose the reservoir to the rays of the warm sun. Flush / Flow Test Procedure Important All labor operations that include removal of the transmission from the vehicle and require the transmission oil pan or transmission side cover to be removed include labor time to flush the transmission oil cooler system. Refer to SI for Automatic Transmission Oil Cooler Flushing and Flow Test J 45096 for the appropriate procedure. Important The J 45096 can be used to flush the transmission oil cooler system on an Allison equipped vehicle, but the flow meter should not be utilized. Refer to SI for Automatic Transmission Oil Cooler Flushing and Flow Test J 45096 for the appropriate flow check procedure. Machine Displays After completion of the flush and flow test, the following information is to be recorded on the repair order. This information is displayed on the Transmission Cooling System Service Tool, J 45096, Transflow(R) machine when the dial is in the code position. - Tested flow rate (displayed in Gallons Per Minute (GPM) - Temperature (displayed is degrees Fahrenheit) - Cycle number (a number) - Seven digit Alpha/Numeric flow code (i.e. A10DFB2) Warranty Information Important All labor operations that include removal of the transmission from the vehicle include labor time to flush the transmission oil cooler system. Performing a transmission oil cooling system flush and flow test will use between 4.7-7.5 L (5-8 qts) of DEXRON(R)VI transmission fluid. The amount Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Cooler, A/T > Component Information > Technical Service Bulletins > A/T - Fluid Oil Cooler Flush > Page 10683 of transmission fluid (ATF), (DEXRON(R)VI) (fluid) that is to be charged for the flush portion of the repair should not exceed the allowable charge for 7.5 L (2 gal) of fluid. This expense should be shown in the Parts Section of the warranty claim document. The Seven digit Alpha/Numeric flow code, i.e. A10DFB2, "MUST" be written on the job card and placed in the comments section of the warranty claim. Any repair that requires the technician to contact the Product Quality Center (PQC) must also include the seven digit flow code. The agent will request the seven digit flow code and add the information to the PQC case prior to providing authorization for the warranty claim. The Seven digit Alpha/Numeric flow code, i.e. A10DFB2, "MUST" be written on the job card, entered in the warranty claim labor operation Flush Code additional field (when available) and placed in the comments section of the warranty claim. Any repair that requires the technician to contact the Product Quality Center (PQC) must also include the seven digit flow code. The agent will request the seven digit flow code and add the information to the PQC case prior to providing authorization for the warranty claim. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Cooler, A/T > Component Information > Technical Service Bulletins > A/T - Fluid Oil Cooler Flush > Page 10684 Transmission Cooler: Technical Service Bulletins A/T - Water Or Coolant Contamination Information INFORMATION Bulletin No.: 08-07-30-035B Date: November 01, 2010 Subject: Information on Water or Ethylene Glycol in Transmission Fluid Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks with Automatic Transmission Supercede: This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 08-07-30-035A (Section 07 - Transmission/Transaxle). Water or ethylene glycol in automatic transmission fluid (ATF) is harmful to internal transmission components and will have a negative effect on reliability and durability of these parts. Water or ethylene glycol in ATF will also change the friction of the clutches, frequently resulting in shudder during engagement or gear changes, especially during torque converter clutch engagement. Indications of water in the ATF may include: - ATF blowing out of the transmission vent tube. - ATF may appear cloudy or, in cases of extreme contamination, have the appearance of a strawberry milkshake. - Visible water in the oil pan. - A milky white substance inside the pan area. - Spacer plate gaskets that appear to be glued to the valve body face or case. - Spacer plate gaskets that appear to be swollen or wrinkled in areas where they are not compressed. - Rust on internal transmission iron/steel components. If water in the ATF has been found and the source of the water entry has not been identified, or if a leaking in-radiator transmission oil cooler is suspected (with no evidence of cross-contamination in the coolant recovery reservoir), a simple and quick test kit is available that detects the presence of ethylene glycol in ATF. The "Gly-Tek" test kit, available from the Nelco Company, should be obtained and the ATF tested to make an accurate decision on the need for radiator replacement. This can help to prevent customer comebacks if the in-radiator transmission oil cooler is leaking and reduce repair expenses by avoiding radiator replacement if the cooler is not leaking. These test kits can be obtained from: Nelco Company Test kits can be ordered by phone or through the website listed above. Orders are shipped standard delivery time but can be shipped on a next day delivery basis for an extra charge. One test kit will complete 10 individual fluid sample tests. For vehicles repaired under warranty, the cost of the complete test kit plus shipping charges should be divided by 10 and submitted on the warranty claim as a net item. The transmission should be repaired or replaced based on the normal cost comparison procedure. Important If water or coolant is found in the transmission, the following components MUST be replaced. - Replace all of the rubber-type seals. - Replace all of the composition-faced clutch plates and/or bands. - Replace all of the nylon parts. - Replace the torque converter. - Thoroughly clean and rebuild the transmission, using new gaskets and oil filter. Important The following steps must be completed when repairing or replacing. Flush and flow check the transmission oil cooler using J 45096. Refer to Corporate Bulletin Number 02-07-30-052F- Automatic Transmission Oil Cooler Flush and Flow Test Essential Tool J 45096 TransFlow. - Thoroughly inspect the engine cooling system and hoses and clean/repair as necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Cooler, A/T > Component Information > Technical Service Bulletins > A/T - Fluid Oil Cooler Flush > Page 10685 Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Mount, A/T > Component Information > Service and Repair Transmission Mount: Service and Repair Transmission Mount Spacer - Replacement Removal Procedure 1. Raise the vehicle. 2. Remove the transmission mount. 3. Remove the transmission mount spacer mounting bolts (2). 4. Remove the transmission mount spacer (1). Installation Procedure 1. Install the transmission mount spacer (1). Notice: Refer to Fastener Notice in Service Precautions. 2. Install the transmission mount spacer mounting bolts (2). Tighten the bolts to 65 Nm (48 ft. lbs.). 3. Install the transmission mount. 4. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10692 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10693 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10694 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 10695 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Speed Sensor, A/T > Component Information > Locations Transmission Speed Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Speed Sensor, A/T > Component Information > Locations > Page 10699 Vehicle Speed Sensor (VSS) 1 - VSS Sensor 2 - Transfer Case Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Speed Sensor, A/T > Component Information > Locations > Page 10700 Transmission Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Input Speed Sensor (ISS) Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Transmission Temperature Sensor/Switch, A/T > Component Information > Specifications Transmission Fluid Temperature (TFT) Sensor Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 01-07-30-038D > Sep > 06 > A/T - Poor Performance/MIL ON/DTC P0757 Valve Body: Customer Interest A/T - Poor Performance/MIL ON/DTC P0757 Bulletin No.: 01-07-30-038D Date: September 12, 2006 TECHNICAL Subject: Diagnostic Trouble Code (DTC) P0757 Set, Malfunction Indicator Lamp (MIL) Illuminated, Poor Performance of Transmission, Transmission Slipping (Clean Transmission Valve Body and Case Oil Passages of Debris) Models: 2007 and Prior GM Passenger Cars and Light Duty Trucks 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X with 4L60-E/4L65-E/4L70-E Automatic Transmission (RPOs M30/M32/M70) Supercede: This bulletin is being revised to add the 2007 model year and the 4L70-E transmission. Also, information has been added to Condition, Cause and Correction. Please discard Corporate Bulletin Number 01-07-30-038C (Section 07 - Transmission/Transaxle). Condition Some customers may comment on any of the following conditions: An illuminated MIL where DTC P0757 is found as a history code in the PCM or TCM. No 3rd and 4th gear. The transmission does not shift correctly. The transmission feels like it shifts to Neutral or a loss of drive occurs. The vehicle free wheels above 48 km/h (30 mph). High RPM needed to overcome the free wheeling. Cause This condition may be caused by any of the following: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 01-07-30-038D > Sep > 06 > A/T - Poor Performance/MIL ON/DTC P0757 > Page 10712 Chips or debris plugging the bleed orifice of the 2-3 shift solenoid (367). This will cause the transmission to stay in 2nd gear when 3rd gear is commanded and return to 1st gear when 4th gear is commanded. A 2-3 shift valve (368) or 2-3 shuttle valve (369) that is stuck, restricted and/or hung-up in its bore. This condition may also be an indication of a damaged 2-4 band or 3-4 clutches. This clutch damage may generate debris causing the 2-3 shift valve line-up to stick in the valve body bore and set DTC P0757. Correction Inspect the condition of the transmission fluid for signs of overheat or a burnt odor. If either is noted, the transmission should be disassembled for further investigation and repaired as needed. Inspect the inside of the oil pan for signs of clutch friction material. A small amount of friction material in the bottom of the pan is normal. If a large amount of clutch material is noted in the fluid or bottom pan, the transmission should be disassembled for further investigation and repaired as needed. Inspect and clean the 2-3 shift valve (368), the 2-3 shuttle valve (369) and the valve bore of debris/metal chips. Inspect and clean the 2-3 shift solenoid (367B) opening of debris/metal chips. While inspecting the 2-3 shift solenoid (367B), look for a screen over the solenoid opening. If the solenoid DOES NOT have a screen, replace the solenoid. All current GMSPO stock shift solenoids have a screen over the solenoid opening. If clutch debris is found, it is also very important to inspect the pressure control (PC) solenoid valve fluid screens. Clean or replace the PC solenoid as necessary. It is also important to flush and flow check the transmission oil cooler using J 45096. Refer to SI "Automatic Transmission Oil Cooler Flushing and Flow Test" for the procedure. Refer to the appropriate Service Manual for additional diagnostic information and service procedures. Warranty Information For repairs performed under warranty, use the applicable published labor code and information. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 01-07-30-036H > Jan > 09 > A/T Control - DTC P0756 Diagnostic Tips Valve Body: All Technical Service Bulletins A/T Control - DTC P0756 Diagnostic Tips INFORMATION Bulletin No.: 01-07-30-036H Date: January 29, 2009 Subject: Diagnostic Tips for Automatic Transmission DTC P0756, Second, Third, Fourth Gear Start Models: 2009 and Prior GM Passenger Cars and Light Duty Trucks 2009 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with 4L60-E, 4L65-E or 4L70E Automatic Transmission (RPOs M30, M32 or M70) Supercede: This bulletin is being revised to add the 2009 model year and add details regarding spacer plates. Please discard Corporate Bulletin Number 01-07-30-036G (Section 07 - Transmission/Transaxle). Some dealership technicians may have difficulty diagnosing DTC P0756, 2-3 Shift Valve Performance on 4L60-E, 4L65-E or 4L70E automatic transmissions. As detailed in the Service Manual, when the PCM detects a 4-3-3-4 shift pattern, DTC P0756 will set. Some customers may also describe a condition of a second, third or fourth gear start that may have the same causes but has not set this DTC yet. Below are some tips when diagnosing this DTC: ^ This is a performance code. This means that a mechanical malfunction exists. ^ This code is not set by electrical issues such as a damaged wiring harness or poor electrical connections. Electrical problems would cause a DTC P0758, P0787 or P0788 to set. ^ The most likely cause is chips/debris plugging the filtered AFL oil at orifice # 29 on the top of the spacer plate (48). This is a very small hole and is easily plugged by a small amount of debris. It is important to remove the spacer plate and inspect orifice # 29 and the immediate area for the presence of chips/debris. Also, the transmission case passage directly above this orifice and the valve body passage directly below should be inspected and cleaned of any chips/debris. For 2003 and newer vehicles the spacer plate should be replaced. The service replacement spacer plate is a bonded style with gaskets and solenoid filter screens bonded to the spacer plate. These screens can help to prevent plugging of orifice # 29 caused by small debris or chips. ^ This code could be set if the 2-3 shift valve (368) were stuck or hung-up in its bore. Inspect the 2-3 shift valve (368) and the 2-3 shuttle valve (369) for free movement or damage and clean the valves, the bore and the valve body passages. ^ This code could be set by a 2-3 shift solenoid (367b) if it were cracked, broken or leaking. Refer to Shift Solenoid Leak Test in the appropriate Service Manual for the leak test procedure. Based on parts return findings, a damaged or leaking shift solenoid is the least likely cause of this condition. Simply replacing a shift solenoid will not correct this condition unless the solenoid has been found to be cracked, broken or leaking. It is important to also refer to the appropriate Service Manual or Service Information (SI) for further possible causes of this condition. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning Valve Body: All Technical Service Bulletins A/T - Valve Body Reconditioning Bulletin No.: 07-07-30-024 Date: September 27, 2007 INFORMATION Subject: Information on 4L60-E M30 Rear Wheel Drive Automatic Transmission Valve Body Reconditioning, DTC P0741, P0756, P0894, Harsh 1-2 Shift Models The following new service information outlined in this bulletin will aid technicians in providing easy to follow valve body reconditioning instructions and new illustrations to simplify reassembly of the valve body. This service bulletin will also provide additional service information documents that are related to the 4L60-E transmission. Related Service Documents DTC P0741 - Torque Converter Clutch (TCC) System - Stuck Off. Refer to Service Bulletin 04-07-30-041. DTC P0756 - 2-3 Shift Solenoid Valve Performance - No First or Second Gear. Refer to Service Bulletin 01-07-30-036F. DTC P0894 - Transmission Component Slipping. Refer to Service Bulletin 06-07-30-007. Harsh 1-2 Shift. Refer to Bulletin PIP3170E. If valve body cleaning is not required, Do Not disassemble the bores unless it is necessary to verify movement of valves. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10722 Inspection Procedure Using the exploded views in this bulletin, inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves related to the customer's concern. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal due to small tolerances between the valves and bores. If a valve is restricted and cannot be corrected by cleaning the valve and bore, then replace the valve body. Describe the restricted valve on the repair order. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10723 Valve Body Spring and Bore Plug Chart (inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10724 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10725 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10726 Left Side Control Valve Body Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10727 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10728 Right Side Control Valve Body Assembly Be sure all solenoids are installed with the electrical connectors facing the non-machined (cast) side of the valve body; otherwise the solenoids will bind against the transmission case as the valve body bolts are tightened and damage may occur. Disassembly/Reassembly If a valve is restricted by a metal burr from machining that bore, remove the valve and burr, then inspect movement in the valve's normal position. If no Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10729 other debris or restrictions are found, then reassemble the valve body and install in the transmission. If the valve body has been contaminated with debris from another transmission component failure, then disassemble all bores for complete cleaning of all valve body components. If possible, keep individual bore parts separated for ease of reassembly. Use the illustrations in this bulletin for a positive identification and location of individual parts: Using GM Brake Clean, or equivalent, in a safe and clean environment (clean aluminum pan), clean the valve body and dry it with compressed air. Use appropriate eye protection. Clean individual valve body components with GM Brake Clean, or equivalent. Coat each valve with clean ATF and reassemble in each bore. Check each valve for free movement during assembly of each bore. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 01-07-30-038D > Sep > 06 > A/T - Poor Performance/MIL ON/DTC P0757 Valve Body: All Technical Service Bulletins A/T - Poor Performance/MIL ON/DTC P0757 Bulletin No.: 01-07-30-038D Date: September 12, 2006 TECHNICAL Subject: Diagnostic Trouble Code (DTC) P0757 Set, Malfunction Indicator Lamp (MIL) Illuminated, Poor Performance of Transmission, Transmission Slipping (Clean Transmission Valve Body and Case Oil Passages of Debris) Models: 2007 and Prior GM Passenger Cars and Light Duty Trucks 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X with 4L60-E/4L65-E/4L70-E Automatic Transmission (RPOs M30/M32/M70) Supercede: This bulletin is being revised to add the 2007 model year and the 4L70-E transmission. Also, information has been added to Condition, Cause and Correction. Please discard Corporate Bulletin Number 01-07-30-038C (Section 07 - Transmission/Transaxle). Condition Some customers may comment on any of the following conditions: An illuminated MIL where DTC P0757 is found as a history code in the PCM or TCM. No 3rd and 4th gear. The transmission does not shift correctly. The transmission feels like it shifts to Neutral or a loss of drive occurs. The vehicle free wheels above 48 km/h (30 mph). High RPM needed to overcome the free wheeling. Cause This condition may be caused by any of the following: Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 01-07-30-038D > Sep > 06 > A/T - Poor Performance/MIL ON/DTC P0757 > Page 10734 Chips or debris plugging the bleed orifice of the 2-3 shift solenoid (367). This will cause the transmission to stay in 2nd gear when 3rd gear is commanded and return to 1st gear when 4th gear is commanded. A 2-3 shift valve (368) or 2-3 shuttle valve (369) that is stuck, restricted and/or hung-up in its bore. This condition may also be an indication of a damaged 2-4 band or 3-4 clutches. This clutch damage may generate debris causing the 2-3 shift valve line-up to stick in the valve body bore and set DTC P0757. Correction Inspect the condition of the transmission fluid for signs of overheat or a burnt odor. If either is noted, the transmission should be disassembled for further investigation and repaired as needed. Inspect the inside of the oil pan for signs of clutch friction material. A small amount of friction material in the bottom of the pan is normal. If a large amount of clutch material is noted in the fluid or bottom pan, the transmission should be disassembled for further investigation and repaired as needed. Inspect and clean the 2-3 shift valve (368), the 2-3 shuttle valve (369) and the valve bore of debris/metal chips. Inspect and clean the 2-3 shift solenoid (367B) opening of debris/metal chips. While inspecting the 2-3 shift solenoid (367B), look for a screen over the solenoid opening. If the solenoid DOES NOT have a screen, replace the solenoid. All current GMSPO stock shift solenoids have a screen over the solenoid opening. If clutch debris is found, it is also very important to inspect the pressure control (PC) solenoid valve fluid screens. Clean or replace the PC solenoid as necessary. It is also important to flush and flow check the transmission oil cooler using J 45096. Refer to SI "Automatic Transmission Oil Cooler Flushing and Flow Test" for the procedure. Refer to the appropriate Service Manual for additional diagnostic information and service procedures. Warranty Information For repairs performed under warranty, use the applicable published labor code and information. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis Valve Body: All Technical Service Bulletins A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis Bulletin No.: 01-07-30-030B Date: October 18, 2005 INFORMATION Subject: 4L60-E/4L65-E Automatic Transmission Diagnostic Information on Harsh 1-2 Upshift Models: 2001-2006 GM Passenger Cars and Light Duty Trucks 2003-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission Supercede: This bulletin is being revised to add model years and models. Please discard Corporate Bulletin Number 01-07-30-030A (Section 07 - Transmission/Transaxle). The following four conditions have been found to cause the majority of consistent, harsh 1-2 shift comments. ^ Chips/Sediment/Debris/Contamination found in the valve body, 1-2 accumulator valve (371) bore, may cause the 1-2 accumulator valve to stick or hang-up. ^ Chips/Sediment/Debris/Contamination found in the valve body, 4-3 sequence valve (383) bore, may cause the 4-3 sequence valve to stick or hang-up. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10739 A cracked 1-2 accumulator piston (56) that is allowing fluid to leak by. Mislocated/Missing valve body-to-spacer plate check balls (61). When attempting to correct a consistent harsh 1-2 shift, the four conditions listed above should be inspected as possible causes. It is important to also refer to the appropriate Service Manual for further possible causes of this condition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10740 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10741 This diagnostic table should be used when addressing a harsh 1-2 shift concern. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 01-07-30-036H > Jan > 09 > A/T Control - DTC P0756 Diagnostic Tips Valve Body: All Technical Service Bulletins A/T Control - DTC P0756 Diagnostic Tips INFORMATION Bulletin No.: 01-07-30-036H Date: January 29, 2009 Subject: Diagnostic Tips for Automatic Transmission DTC P0756, Second, Third, Fourth Gear Start Models: 2009 and Prior GM Passenger Cars and Light Duty Trucks 2009 and Prior HUMMER H2, H3 2009 and Prior Saab 9-7X with 4L60-E, 4L65-E or 4L70E Automatic Transmission (RPOs M30, M32 or M70) Supercede: This bulletin is being revised to add the 2009 model year and add details regarding spacer plates. Please discard Corporate Bulletin Number 01-07-30-036G (Section 07 - Transmission/Transaxle). Some dealership technicians may have difficulty diagnosing DTC P0756, 2-3 Shift Valve Performance on 4L60-E, 4L65-E or 4L70E automatic transmissions. As detailed in the Service Manual, when the PCM detects a 4-3-3-4 shift pattern, DTC P0756 will set. Some customers may also describe a condition of a second, third or fourth gear start that may have the same causes but has not set this DTC yet. Below are some tips when diagnosing this DTC: ^ This is a performance code. This means that a mechanical malfunction exists. ^ This code is not set by electrical issues such as a damaged wiring harness or poor electrical connections. Electrical problems would cause a DTC P0758, P0787 or P0788 to set. ^ The most likely cause is chips/debris plugging the filtered AFL oil at orifice # 29 on the top of the spacer plate (48). This is a very small hole and is easily plugged by a small amount of debris. It is important to remove the spacer plate and inspect orifice # 29 and the immediate area for the presence of chips/debris. Also, the transmission case passage directly above this orifice and the valve body passage directly below should be inspected and cleaned of any chips/debris. For 2003 and newer vehicles the spacer plate should be replaced. The service replacement spacer plate is a bonded style with gaskets and solenoid filter screens bonded to the spacer plate. These screens can help to prevent plugging of orifice # 29 caused by small debris or chips. ^ This code could be set if the 2-3 shift valve (368) were stuck or hung-up in its bore. Inspect the 2-3 shift valve (368) and the 2-3 shuttle valve (369) for free movement or damage and clean the valves, the bore and the valve body passages. ^ This code could be set by a 2-3 shift solenoid (367b) if it were cracked, broken or leaking. Refer to Shift Solenoid Leak Test in the appropriate Service Manual for the leak test procedure. Based on parts return findings, a damaged or leaking shift solenoid is the least likely cause of this condition. Simply replacing a shift solenoid will not correct this condition unless the solenoid has been found to be cracked, broken or leaking. It is important to also refer to the appropriate Service Manual or Service Information (SI) for further possible causes of this condition. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning Valve Body: All Technical Service Bulletins A/T - Valve Body Reconditioning Bulletin No.: 07-07-30-024 Date: September 27, 2007 INFORMATION Subject: Information on 4L60-E M30 Rear Wheel Drive Automatic Transmission Valve Body Reconditioning, DTC P0741, P0756, P0894, Harsh 1-2 Shift Models The following new service information outlined in this bulletin will aid technicians in providing easy to follow valve body reconditioning instructions and new illustrations to simplify reassembly of the valve body. This service bulletin will also provide additional service information documents that are related to the 4L60-E transmission. Related Service Documents DTC P0741 - Torque Converter Clutch (TCC) System - Stuck Off. Refer to Service Bulletin 04-07-30-041. DTC P0756 - 2-3 Shift Solenoid Valve Performance - No First or Second Gear. Refer to Service Bulletin 01-07-30-036F. DTC P0894 - Transmission Component Slipping. Refer to Service Bulletin 06-07-30-007. Harsh 1-2 Shift. Refer to Bulletin PIP3170E. If valve body cleaning is not required, Do Not disassemble the bores unless it is necessary to verify movement of valves. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10751 Inspection Procedure Using the exploded views in this bulletin, inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves related to the customer's concern. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal due to small tolerances between the valves and bores. If a valve is restricted and cannot be corrected by cleaning the valve and bore, then replace the valve body. Describe the restricted valve on the repair order. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10752 Valve Body Spring and Bore Plug Chart (inch) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10753 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10754 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10755 Left Side Control Valve Body Assembly Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10756 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10757 Right Side Control Valve Body Assembly Be sure all solenoids are installed with the electrical connectors facing the non-machined (cast) side of the valve body; otherwise the solenoids will bind against the transmission case as the valve body bolts are tightened and damage may occur. Disassembly/Reassembly If a valve is restricted by a metal burr from machining that bore, remove the valve and burr, then inspect movement in the valve's normal position. If no Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 07-07-30-024 > Sep > 07 > A/T - Valve Body Reconditioning > Page 10758 other debris or restrictions are found, then reassemble the valve body and install in the transmission. If the valve body has been contaminated with debris from another transmission component failure, then disassemble all bores for complete cleaning of all valve body components. If possible, keep individual bore parts separated for ease of reassembly. Use the illustrations in this bulletin for a positive identification and location of individual parts: Using GM Brake Clean, or equivalent, in a safe and clean environment (clean aluminum pan), clean the valve body and dry it with compressed air. Use appropriate eye protection. Clean individual valve body components with GM Brake Clean, or equivalent. Coat each valve with clean ATF and reassemble in each bore. Check each valve for free movement during assembly of each bore. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis Valve Body: All Technical Service Bulletins A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis Bulletin No.: 01-07-30-030B Date: October 18, 2005 INFORMATION Subject: 4L60-E/4L65-E Automatic Transmission Diagnostic Information on Harsh 1-2 Upshift Models: 2001-2006 GM Passenger Cars and Light Duty Trucks 2003-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X with 4L60-E or 4L65-E Automatic Transmission Supercede: This bulletin is being revised to add model years and models. Please discard Corporate Bulletin Number 01-07-30-030A (Section 07 - Transmission/Transaxle). The following four conditions have been found to cause the majority of consistent, harsh 1-2 shift comments. ^ Chips/Sediment/Debris/Contamination found in the valve body, 1-2 accumulator valve (371) bore, may cause the 1-2 accumulator valve to stick or hang-up. ^ Chips/Sediment/Debris/Contamination found in the valve body, 4-3 sequence valve (383) bore, may cause the 4-3 sequence valve to stick or hang-up. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10763 A cracked 1-2 accumulator piston (56) that is allowing fluid to leak by. Mislocated/Missing valve body-to-spacer plate check balls (61). When attempting to correct a consistent harsh 1-2 shift, the four conditions listed above should be inspected as possible causes. It is important to also refer to the appropriate Service Manual for further possible causes of this condition. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10764 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Valve Body: > 01-07-30-030B > Oct > 05 > A/T - 4L60-E/4L65-E Harsh 1-2 Upshift Diagnosis > Page 10765 This diagnostic table should be used when addressing a harsh 1-2 shift concern. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10766 Valve Body: Diagrams Disassembled Views Control Valve Body Assembly 350 - Control Valve Body Assembly 353 - Forward Accumulator Oil Seal 354 - Forward Accumulator Piston 355 - Forward Accumulator Pin 356 - Forward Accumulator Spring 357 Forward Abuse Valve 358 - Forward Abuse Valve Spring 359 - Bore Plug 360 - Coiled Spring Pin 360 - Coiled Spring Pin 361 - Low Overrun Valve 362 - Low Overrun Valve Spring 363 - Forward Accumulator Cover 364 - Forward Accumulator Cover Bolt 364a - Pressure Control Solenoid Retainer Bolt 365 - 1-2 Shift Valve Spring - Model Dependent 366 - 1-2 Shift Valve - Model Dependent 367a - 1-2 Shift Solenoid Valve 367b - 2-3 Shift Solenoid Valve 368 - 2-3 Shift Valve 369 - 2-3 Shuttle Valve 370 - 1-2 Accumulator Valve Spring 371 - 1-2 Accumulator Valve 372 - 1-2 Accumulator Valve Sleeve 374 - Actuator Feed Limit Valve 375 - Actuator Feed Limit Valve Spring 376 - Bore Plug 377 - Pressure Control Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10767 378 - Pressure Control Solenoid Retainer 395 - Bore Plug and Solenoid Retainer 395 - Bore Plug and Solenoid Retainer 395 - Bore Plug and Solenoid Retainer Control Valve Body Assembly 340 - Manual Valve 350 - Control Valve Body Assembly 359 - Bore Plug 360 - Coiled Spring Pin 380 - Regulator Apply Valve 381 - Bore Plug 381 - Bore Plug 381 - Bore Plug 381 - Bore Plug 382 4-3 Sequence Valve Spring 383 - 4-3 Sequence Valve 384 - 3-4 Relay Valve 385 - 3-4 Shift Valve 386 - 3-4 Shift Valve Spring 387 - Reverse Abuse Valve 388 - Reverse Abuse Valve Spring 389 3-2 Downshift Valve 390 - 3-2 Downshift Valve Spring 391 - 3-2 Control Valve 392 - 3-2 Control Valve Spring 394 - 3-2 Control Solenoid Valve 395 - Bore Plug and Solenoid Retainer 395 - Bore Plug and Solenoid Retainer 395 - Bore Plug and Solenoid Retainer 395 - Bore Plug and Solenoid Retainer 395 - Bore Plug and Solenoid Retainer 395 - Bore Plug and Solenoid Retainer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10768 396 - TCC PWM Solenoid Valve 397 - Regulator Apply Spring 398 - Isolator Valve 399 - Pump Ball Check Valve - M33 Only Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10769 Valve Body: Service and Repair Valve Body and Pressure Switch Replacement Removal Procedure 1. Ensure that removal of the valve body is necessary before proceeding. ^ Important: The following components can be serviced without removing the valve body from the transmission: The torque converter clutch solenoid (1) ^ The pressure control solenoid (2) ^ The internal wiring harness (3) ^ The 2-3 shift solenoid (4) ^ The 1-2 shift solenoid (5) ^ The transmission fluid pressure manual valve position switch (6) ^ The 3-2 shift solenoid (7) ^ The torque converter clutch pulse width modulation (TCC PWM) solenoid (8) 2. Remove the fluid level indicator. 3. Raise the vehicle. 4. Remove the oil pan, gasket, and filter. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10770 6. Remove the fluid indicator stop bracket bolt (2). 7. Remove the fluid indicator bracket (1). 8. Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible. 9. Remove the TCC PWM solenoid (1) in order to access the TCC solenoid retaining bolts. 10. Remove the TCC solenoid retaining bolts. 11. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body. 12. Reposition the harness to the side of the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10771 13. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. 14. Remove the transmission fluid pressure switch. 15. Inspect the transmission fluid pressure switch for damage or debris. 16. Remove the manual detent spring retaining bolt. 17. Remove the manual detent spring. 18. Inspect the manual detent spring for cracks or damage. 19. Remove the remaining control valve body bolts. Important: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10772 20. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. Installation Procedure Ball Check Valves 1. Install the checkballs (1-7) in the valve body. 2. Install the control valve body to the transmission case while simultaneously connecting the manual valve link to the manual valve. 3. Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2). 4. Install one bolt (M6 X 1.0 X 47.5) hand tight in the center (1) of the valve body to hold it in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10773 5. Do not install the transmission fluid indicator stop bracket and bolt at this time. Install but do not tighten the control valve body bolts which retain only the valve body directly. Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following: ^ M6 X 1.0 X 65.0 (1) ^ M6 X 1.0 X 54.4 (2) ^ M6 X 1.0 X 47.5 (3) ^ M6 X 1.0 X 35.0 (4) ^ M8 X 1.0 X 20.0 (5) ^ M6 X 1.0 X 12.0 (6) ^ M6 X 1.0 X 18.0 (7) Important: When installing bolts throughout this procedure, be sure to use the correct bolt size and length in the correct location as specified. 6. Install the manual detent spring. 7. Install but do not tighten the manual detent spring retaining bolt. 8. Install the transmission fluid pressure switch. 9. Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10774 10. Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows. Tighten the control valve body bolts (in sequence) to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation. 11. Ensure that the manual detent spring is aligned properly with the detent lever. Tighten the manual detent spring bolt to 31 Nm (23 ft. lbs.). 12. Install the TCC solenoid with a new O-ring seal to the valve body. 13. Install the TCC solenoid bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10775 Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). 14. Install the internal wiring harness to the valve body. The internal wiring harness has a tab (1) on the edge of the conduit. 15. Place the tab between the valve body and the pressure switch in the location shown (2). Press the harness into position on the valve body bolt bosses (1, 3). 16. Install the TCC PWM solenoid (1) to the control valve body. 17. Install the TCC PWM solenoid retainer (2). 18. Install the transmission fluid indicator stop bracket (1) and bolt (2). Tighten the transmission fluid indicator stop bracket bolt to 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Valve Body, A/T > Component Information > Technical Service Bulletins > Page 10776 19. Connect the internal wiring harness electrical connectors to the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) 20. Install the transmission oil pan and filter. 21. Lower the vehicle. 22. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 23. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Wiring Harness: Customer Interest A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Bulletin No.: 06-07-30-007A Date: February 20, 2007 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) On, Diagnostic Trouble Code (DTC) P0894, Harsh 1-2 Shift with 4L60-E, 4L65-E, 4L70-E Automatic Transmission (Test and Replace Torque Converter Clutch (TCC) Enable Solenoid/Harness, Auto Trans Wiring) Models: 2006 Cadillac Escalade Models 2006 Chevrolet Light Duty Trucks 2006 Chevrolet Express Vans 2006 GMC Light Duty Trucks 2006 GMC Savana Vans 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E / 4L65-E / 4L70-E (RPOs M30, M32, M70) Automatic Transmission Supercede: This bulletin is being revised to add part number for vehicles with Input Speed Sensor (ISS). Please discard Corporate Bulletin Number 06-07-30-007 (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a harsh 1-2 shift with the MIL illuminated. Diagnosis with a scan tool may reveal a DTC P0894. Cause This condition may be caused by a leaking TCC enable solenoid. The TCC enable solenoid is part of the automatic transmission wiring harness. Correction Follow the diagnosis and repair procedure below for a DTC P0894. With a scan tool, verify the presence of DTC P0894. Remove the TCC Enable solenoid / automatic transmission wiring harness. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10785 Typically if the TCC enable solenoid is found to have a crack/fracture (2), it will be located parallel to the mold seam (1) as shown above. Engineering investigation shows that TCC enable solenoids that are brown in color may exhibit the cracking / fracture condition. Engineering investigation shows that TCC enable solenoids that are off-white in color do not exhibit the cracking / fracture condition. Air check the TCC enable solenoid using J 44246 solenoid testing kit. Install the TCC enable solenoid into bore # 2 of J 44246 as shown above. While air is being applied to the solenoid through J 44246, coat the outside of the solenoid body with transmission fluid to help expose a possible vertical crack in the molded part of the solenoid body. This crack may be very small and not visible without the use of ATF. Complete instructions for the Shift Solenoid Leak Test can be found in SI Document ID # 856531. If NO visual leaks are found in the TCC enable solenoid, refer to DTC P0894 in the appropriate SI Document. If visual leaks are found in the TCC enable solenoid, continue with the next step. Replace the TCC enable solenoid. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Road test the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 06-07-30-007A > Feb > 07 > A/T - MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10786 Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 01-07-30-002E > Sep > 05 > Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's Wiring Harness: Customer Interest Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's Bulletin No.: 01-07-30-002E Date: September 23, 2005 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) On, Transmission Stuck in Second or Third Gear, Instrument Cluster Inoperative (Verify and Repair Source of Voltage Loss In Transmission Solenoid Power Supply Circuit) Models: 2006 and Prior GM Passenger Cars and Light Duty Trucks 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X with 4L60-E, 4L65-E, 4L80-E or 4L85-E Automatic Transmission (RPOs M30, M32, M33, MT1, MN8) Supercede: This bulletin is being revised to update model years, add additional models and add additional diagnostic information. Please discard Corporate Bulletin Number 01-07-30-002D (Section 07 Transmission/Transaxle). Condition Some customers may comment on one or more of the following conditions: ^ The Malfunction Indicator Lamp (MIL) is ON. ^ The transmission is defaulted to second gear (4L80/85-E). ^ The transmission is defaulted to third gear (4L60/65-E). ^ The instrument cluster is inoperative. Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740, P0753, P0758, P0785, P0787, P0973, P0976, P1860, P2761, P2764 and P2769 may be set depending on the vehicle. Cause The most likely cause of this condition may be a loss of voltage to the transmission solenoid power supply circuit. This condition may also be the result of an incorrect installation of an aftermarket electronic device such as a remote starter or alarm system. Correction Important: If the vehicle is equipped with an aftermarket electronic device and the DTCs are being set when the device is being used, verify that the appropriate fuse is being supplied battery voltage during operation. If voltage is not present at this fuse, these DTCs will be set due to lack of voltage at the solenoids. This condition is most likely to occur with an incorrectly installed remote starting system. If this is the case, refer the customer to the installer of the system for corrections. ANY REPAIRS DUE TO AFTERMARKET INSTALLATION OF ACCESSORIES IS A NON-WARRANTABLE ITEM. 1. With the ignition switch in the RUN position, test for battery voltage at the circuit fuse in the transmission solenoid power supply circuit. Refer to the appropriate SI Document for the transmission solenoid power supply circuit information. 2. If battery voltage is present at the fuse, inspect the ignition voltage circuit between the fuse and the transmission for possible opens. 3. If battery voltage is not present at the fuse, test for continuity between the fuse and the ignition switch. If NO continuity is between the fuse and the ignition switch, repair the open in that circuit. 4. If you have continuity between the fuse and the ignition switch, the most likely cause is the ignition switch. Replace the ignition switch using the appropriate Ignition Switch Replacement procedure in SI. Refer to group number 2.188 of the parts catalog for part description and usage of the ignition switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > Customer Interest: > 01-07-30-002E > Sep > 05 > Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's > Page 10791 Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 06-07-30-007A > Feb > 07 > A/T MIL ON/DTC P0894/Harsh 1-2 Shift Wiring Harness: All Technical Service Bulletins A/T - MIL ON/DTC P0894/Harsh 1-2 Shift Bulletin No.: 06-07-30-007A Date: February 20, 2007 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) On, Diagnostic Trouble Code (DTC) P0894, Harsh 1-2 Shift with 4L60-E, 4L65-E, 4L70-E Automatic Transmission (Test and Replace Torque Converter Clutch (TCC) Enable Solenoid/Harness, Auto Trans Wiring) Models: 2006 Cadillac Escalade Models 2006 Chevrolet Light Duty Trucks 2006 Chevrolet Express Vans 2006 GMC Light Duty Trucks 2006 GMC Savana Vans 2006 Pontiac GTO 2006 HUMMER H2, H3 2006 Saab 9-7X with 4L60-E / 4L65-E / 4L70-E (RPOs M30, M32, M70) Automatic Transmission Supercede: This bulletin is being revised to add part number for vehicles with Input Speed Sensor (ISS). Please discard Corporate Bulletin Number 06-07-30-007 (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a harsh 1-2 shift with the MIL illuminated. Diagnosis with a scan tool may reveal a DTC P0894. Cause This condition may be caused by a leaking TCC enable solenoid. The TCC enable solenoid is part of the automatic transmission wiring harness. Correction Follow the diagnosis and repair procedure below for a DTC P0894. With a scan tool, verify the presence of DTC P0894. Remove the TCC Enable solenoid / automatic transmission wiring harness. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 06-07-30-007A > Feb > 07 > A/T MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10797 Typically if the TCC enable solenoid is found to have a crack/fracture (2), it will be located parallel to the mold seam (1) as shown above. Engineering investigation shows that TCC enable solenoids that are brown in color may exhibit the cracking / fracture condition. Engineering investigation shows that TCC enable solenoids that are off-white in color do not exhibit the cracking / fracture condition. Air check the TCC enable solenoid using J 44246 solenoid testing kit. Install the TCC enable solenoid into bore # 2 of J 44246 as shown above. While air is being applied to the solenoid through J 44246, coat the outside of the solenoid body with transmission fluid to help expose a possible vertical crack in the molded part of the solenoid body. This crack may be very small and not visible without the use of ATF. Complete instructions for the Shift Solenoid Leak Test can be found in SI Document ID # 856531. If NO visual leaks are found in the TCC enable solenoid, refer to DTC P0894 in the appropriate SI Document. If visual leaks are found in the TCC enable solenoid, continue with the next step. Replace the TCC enable solenoid. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness in the appropriate SI Document. Road test the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 06-07-30-007A > Feb > 07 > A/T MIL ON/DTC P0894/Harsh 1-2 Shift > Page 10798 Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 01-07-30-002E > Sep > 05 > Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's Wiring Harness: All Technical Service Bulletins Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's Bulletin No.: 01-07-30-002E Date: September 23, 2005 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) On, Transmission Stuck in Second or Third Gear, Instrument Cluster Inoperative (Verify and Repair Source of Voltage Loss In Transmission Solenoid Power Supply Circuit) Models: 2006 and Prior GM Passenger Cars and Light Duty Trucks 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X with 4L60-E, 4L65-E, 4L80-E or 4L85-E Automatic Transmission (RPOs M30, M32, M33, MT1, MN8) Supercede: This bulletin is being revised to update model years, add additional models and add additional diagnostic information. Please discard Corporate Bulletin Number 01-07-30-002D (Section 07 Transmission/Transaxle). Condition Some customers may comment on one or more of the following conditions: ^ The Malfunction Indicator Lamp (MIL) is ON. ^ The transmission is defaulted to second gear (4L80/85-E). ^ The transmission is defaulted to third gear (4L60/65-E). ^ The instrument cluster is inoperative. Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740, P0753, P0758, P0785, P0787, P0973, P0976, P1860, P2761, P2764 and P2769 may be set depending on the vehicle. Cause The most likely cause of this condition may be a loss of voltage to the transmission solenoid power supply circuit. This condition may also be the result of an incorrect installation of an aftermarket electronic device such as a remote starter or alarm system. Correction Important: If the vehicle is equipped with an aftermarket electronic device and the DTCs are being set when the device is being used, verify that the appropriate fuse is being supplied battery voltage during operation. If voltage is not present at this fuse, these DTCs will be set due to lack of voltage at the solenoids. This condition is most likely to occur with an incorrectly installed remote starting system. If this is the case, refer the customer to the installer of the system for corrections. ANY REPAIRS DUE TO AFTERMARKET INSTALLATION OF ACCESSORIES IS A NON-WARRANTABLE ITEM. 1. With the ignition switch in the RUN position, test for battery voltage at the circuit fuse in the transmission solenoid power supply circuit. Refer to the appropriate SI Document for the transmission solenoid power supply circuit information. 2. If battery voltage is present at the fuse, inspect the ignition voltage circuit between the fuse and the transmission for possible opens. 3. If battery voltage is not present at the fuse, test for continuity between the fuse and the ignition switch. If NO continuity is between the fuse and the ignition switch, repair the open in that circuit. 4. If you have continuity between the fuse and the ignition switch, the most likely cause is the ignition switch. Replace the ignition switch using the appropriate Ignition Switch Replacement procedure in SI. Refer to group number 2.188 of the parts catalog for part description and usage of the ignition switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 01-07-30-002E > Sep > 05 > Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's > Page 10803 Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wiring Harness: > 06-08-52-003B > Nov > 07 > Body - L/H Front Door Won't Unlock With Key Door Lock Cylinder: All Technical Service Bulletins Body - L/H Front Door Won't Unlock With Key Bulletin No.: 06-08-52-003B Date: November 06, 2007 TECHNICAL Subject: EI06038 - Left Front Door Will Not Lock/Unlock with Key, Lock Cylinder, Rod (Re-Engage Lock Rod to Clip) Models: 2005-2007 Buick Rainier 2005-2007 Chevrolet TrailBlazer, TrailBlazer EXT 2006-2007 Chevrolet TrailBlazer SS 2005-2007 GMC Envoy, Envoy XL 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to conclude the need for information from the field and provide a corrective action for this condition. Please discard Corporate Bulletin Number 06-08-52-003A (Section 08 - Body and Accessories). Condition Some customers may comment that the left front door cannot be locked or unlocked with the key. Cause This condition may be caused by the lock rod becoming disengaged from the clip. Correction To correct this condition, do the following steps: Remove the door trim panel. Remove the water deflector from the door. Re-engage the lock rod into the clip. Reinstall the water deflector. Reinstall the door trim panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wiring Harness: > 06-08-52-003B > Nov > 07 > Body - L/H Front Door Won't Unlock With Key > Page 10809 Warranty Information (Excluding Saab U.S. Models) Warranty Information (Saab U.S. Models) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Automatic Transmission/Transaxle > Wiring Harness, A/T > Component Information > Technical Service Bulletins > All Other Service Bulletins for Wiring Harness: > 06-08-52-003B > Nov > 07 > Body - L/H Front Door Won't Unlock With Key > Page 10815 Warranty Information (Excluding Saab U.S. Models) Warranty Information (Saab U.S. Models) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Clutch, M/T > Clutch Hydraulic System > System Information > Technical Service Bulletins > M/T - Hydraulic Clutch Bleeding Procedure Improvement Clutch Hydraulic System: Technical Service Bulletins M/T - Hydraulic Clutch Bleeding Procedure Improvement Bulletin No.: 01-07-31-002B Date: November 01, 2006 INFORMATION Subject: Improved Bleeding Procedure for Hydraulic Clutch Release System Models: 2007 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn) 2007 and Prior Chevrolet and GMC 6-7F T-Series Medium Duty Tilt Cab Models 2007 and Prior Isuzu F-Series Medium Duty Tilt Cab Models 2006-2007 HUMMER H3 Supercede: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 01-07-31-002A (Section 07 - Transmission/Transaxle). This bulletin is being issued to inform dealers of an improved procedure to aid in the ease of bleeding the clutch hydraulic system for the above listed vehicles. This procedure can be used anytime air is introduced into the hydraulic system. Following this procedure may also reduce the number of unnecessary parts replaced for low clutch pedal reserve and high shift effort. Verify that all the lines and fittings are dry and secure. Clean the dirt and grease from the reservoir cap in order to ensure that no foreign substances enter the system. Remove the reservoir cap. Fill the reservoir to the proper level with the required fluid. Attach the J 43485 (Adapter) to the J 35555 (Mity Vac), or equivalent. Brake fluid will deteriorate the rubber on J 43485. Use a clean shop cloth to wipe away the fluid after each use. Place and hold the adapter on the reservoir filler neck to ensure a tight fit. In some cases, the adapter will fit into the reservoir opening. Apply a vacuum of 51-68 kPa (15-20 hg) and remove the adapter. Refill the reservoir to the proper level. Repeat Steps 6 and 7. If needed, refill the reservoir and continue to pull a vacuum until no more bubbles can be seen in the reservoir or until the fluid level no longer drops. The vehicle will move if started in gear before the Actuator Cylinder is refilled and operational. Start the vehicle the first time in neutral to help prevent personal injury from vehicle movement and see if the transmission will shift easily into gear. Pump the clutch pedal until firm (to refill actuator cylinder). Add additional fluid if needed. Test drive vehicle to ensure proper operation. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Continuously Variable Transmission/Transaxle, CVT > Shift Interlock, CVT > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Feature Function Shift Interlock: Technical Service Bulletins A/T - Shift Lock Control Feature Function Bulletin No.: 03-07-30-043A Date: May 25, 2006 INFORMATION Subject: Information Regarding Automatic Transmission Shift Lock Control Function Models: 2007 and Prior Passenger Cars and Trucks (Including Saturn) 2007 and Prior HUMMER H2, H3 2005-2007 Saab 9-7X with Automatic Transmission Supercede: This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 03-07-30-043 (Section 07 - Transmission/Transaxle). This bulletin is being issued to better explain how the Automatic Transmission Shift Lock Control (formerly known as Brake Transmission Shift Interlock (BTSI)) feature is intended to operate. Revised wording regarding the shift lock control system began appearing in the Owner Manuals beginning with the 2004 model year. The shift lock control feature was intended to prevent drivers from shifting out of Park with the vehicle running without the brakes applied. However, if the ignition switch is in the Accessory (ACC) position, it may be possible on some vehicles to move the shift lever out of Park WITHOUT first activating the brake. The shift lock control system is ONLY active when the ignition switch is in the RUN or ON position. This means that when the ignition switch is in the RUN or ON position, the shift lever cannot be moved out of the Park position without activating the brake. Some owners may feel that the shift lock control system prevents an unattended child from moving the vehicle. Please stress to owners, as stated in the Owner Manual, that children should NEVER be left unattended in a vehicle, even if the ignition key has been removed from the vehicle. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Differential Carrier > Carrier Bearings > Component Information > Service and Repair Carrier Bearings: Service and Repair Differential Side Bearings Replacement Tools Required ^ J8092 Universal Driver Handle- 3/4 inch - 10 ^ J21784 Side Bearing Installer ^ J22888-D Side Bearing Puller Kit ^ J45231 Differential Side Bearing Installer Removal Procedure 1. Remove the differential. 2. Remove the differential side bearings by performing the following steps: 1. Install the differential assembly in a vise. 2. Install the J22888-20A (2) and the J8107-2, 8.0 inch axle, or the J8107-4, 8.6 inch axle (1), as shown. 3. Remove the differential side bearings using the J22888-20A. 3. Remove the differential assembly from the vise. Installation Procedure 1. Install the differential side bearings by doing the following: 1. In order to protect the differential case, install the J8107-2, 8.0 inch axle, or the J8107-4, 8.6 inch axle, in the case on the side opposite the bearing installation. 2. Install the J45231, 8.0 inch axle, or the J21784, 8.6 inch axle (2), and the J8092 (1) onto the differential case bearing as shown. 3. Drive the bearing onto the case using the J45231, 8.0 inch axle, or the J21784, 8.6 inch axle (2) and the J8092 (1). 2. Install the differential. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Differential Cover > Component Information > Service and Repair Differential Cover: Service and Repair Rear Axle Housing Cover and Gasket Replacement Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Drain the rear axle. 3. Remove the rear axle housing cover bolts (1). 4. Remove the rear axle housing cover (2) from the axle housing. Important: Do not nick or cut the rear axle housing cover gasket. 5. Drain the axle lubricant into a suitable container. Installation Procedure 1. Inspect the rear axle cover gasket for nicks, cuts or damage that may cause the gasket to not seal properly. If any of these conditions exist, replace the gasket. 2. If the gasket is to be reused, clean the rear axle housing cover gasket a suitable cleaner. 3. Clean the rear axle housing cover gasket surface and the rear axle housing gasket surface with a suitable cleaner. 4. Install the rear axle housing cover gasket and the rear axle housing cover (2). Notice: Refer to Fastener in Service Precautions. 5. Install the rear axle housing cover bolts (1). ^ For the 8.0 inch axle, tighten the rear axle housing cover bolts in a crosswise pattern to 30 Nm (20 ft. lbs.). ^ For the 8.6 inch axle, tighten the rear axle housing cover bolts in a crosswise pattern to 25 Nm (18 ft. lbs.). 6. Fill the rear axle with axle lubricant. Use the proper fluid. 7. Lower the vehicle. Refer to Vehicle Lifting. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > Customer Interest: > 08-04-20-002 > Mar > 08 > Drivetrain Growl/Groan/Shudder From Rear Differential Fluid - Differential: Customer Interest Drivetrain - Growl/Groan/Shudder From Rear Differential TECHNICAL Bulletin No.: 08-04-20-002 Date: March 19, 2008 Subject: Jerk/Jump Sensation with Growl/Groan Noise, Shudder, Bind From Rear of Vehicle While Turning (Drain/Refill Rear Differential Fluid) Models: 2006-2008 Chevrolet TrailBlazer SS 2005-2008 Saab 9-7X 2008 Saab 9-7X Aero with Limited Slip Differential (RPO G86) Condition Some customers may comment on a jerk or jump feeling accompanied by a growl/groan noise, shudder or bind from the rear of the vehicle while turning. Cause This may be caused by slip/stick of the posi-traction clutch plates. As plates slip and stick, a jump or jerk feeling occurs accompanied by a growl or groan noise. Correction 1. Remove the rear differential fluid using the procedure provided in SI. Important: DO NOT add any limited-slip additive (friction modifier). With this new fluid (DEXRON(R) LS Gear Oil 75W-90), it is no longer required to add friction modifier. If a friction modifier is added, it will cause the fluid to lose some of its friction reducing properties as well as reducing seal life. 2. Fill the differential with DEXRON(R) LS gear oil, P/N 88862624 (in Canada, P/N 88862625). 3. Follow the procedures in SI for the 8.6 in axle on the Saab 9-7X 4.2L and 5.3L models. The lubricant levels should be between 0 mm to 10 mm (0 in to 0.4 in) below the fill plug opening. 4. Follow the procedures in SI for the 9.5 in LD Axle on TrailBlazer SS and Saab 9-7X Aero models. The lubricant level should be between 15 mm to 40 mm (0.6 in to 1.6 in) below the fill plug opening. 5. Once the differential fluid is changed, the vehicle must be driven in 8-10 tight figure eight maneuvers to allow the fluid to be worked into the clutch plates. Important: If the noise condition is improved by this procedure but is not completely eliminated, it may be necessary to perform the procedure a second time. Notice: There will be some vehicles where the damage to the clutch packs from wear or moisture will be too extensive to be fixed by this procedure. In this case replace the rear differential center section (differential gear case) which includes clutch plate and springs. Parts Information Warranty Information (Excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > Customer Interest: > 08-04-20-002 > Mar > 08 > Drivetrain Growl/Groan/Shudder From Rear Differential > Page 10842 For vehicles repaired under warranty use, the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty use, the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 08-04-20-002 > Mar > 08 > Drivetrain - Growl/Groan/Shudder From Rear Differential Fluid - Differential: All Technical Service Bulletins Drivetrain - Growl/Groan/Shudder From Rear Differential TECHNICAL Bulletin No.: 08-04-20-002 Date: March 19, 2008 Subject: Jerk/Jump Sensation with Growl/Groan Noise, Shudder, Bind From Rear of Vehicle While Turning (Drain/Refill Rear Differential Fluid) Models: 2006-2008 Chevrolet TrailBlazer SS 2005-2008 Saab 9-7X 2008 Saab 9-7X Aero with Limited Slip Differential (RPO G86) Condition Some customers may comment on a jerk or jump feeling accompanied by a growl/groan noise, shudder or bind from the rear of the vehicle while turning. Cause This may be caused by slip/stick of the posi-traction clutch plates. As plates slip and stick, a jump or jerk feeling occurs accompanied by a growl or groan noise. Correction 1. Remove the rear differential fluid using the procedure provided in SI. Important: DO NOT add any limited-slip additive (friction modifier). With this new fluid (DEXRON(R) LS Gear Oil 75W-90), it is no longer required to add friction modifier. If a friction modifier is added, it will cause the fluid to lose some of its friction reducing properties as well as reducing seal life. 2. Fill the differential with DEXRON(R) LS gear oil, P/N 88862624 (in Canada, P/N 88862625). 3. Follow the procedures in SI for the 8.6 in axle on the Saab 9-7X 4.2L and 5.3L models. The lubricant levels should be between 0 mm to 10 mm (0 in to 0.4 in) below the fill plug opening. 4. Follow the procedures in SI for the 9.5 in LD Axle on TrailBlazer SS and Saab 9-7X Aero models. The lubricant level should be between 15 mm to 40 mm (0.6 in to 1.6 in) below the fill plug opening. 5. Once the differential fluid is changed, the vehicle must be driven in 8-10 tight figure eight maneuvers to allow the fluid to be worked into the clutch plates. Important: If the noise condition is improved by this procedure but is not completely eliminated, it may be necessary to perform the procedure a second time. Notice: There will be some vehicles where the damage to the clutch packs from wear or moisture will be too extensive to be fixed by this procedure. In this case replace the rear differential center section (differential gear case) which includes clutch plate and springs. Parts Information Warranty Information (Excluding Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 08-04-20-002 > Mar > 08 > Drivetrain - Growl/Groan/Shudder From Rear Differential > Page 10848 For vehicles repaired under warranty use, the table. Warranty Information (Saab U.S. Models) For vehicles repaired under warranty use, the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking Fluid - Differential: All Technical Service Bulletins Drivetrain - Revised Rear Axle Fluid Level/Checking Bulletin No.: 06-04-20-003 Date: October 10, 2006 SERVICE MANUAL UPDATE Subject: Revised Rear Axle Fluid Capacity and Fluid Level Checking Specification Models: 2005-2007 Buick Rainier 2005-2007 Chevrolet TrailBlazer Models 2005-2007 GMC Envoy Models This bulletin is being issued to revise the rear axle fluid capacity and fluid level checking specification in the Rear Axle sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 10853 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 10854 The information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking Fluid - Differential: All Technical Service Bulletins Drivetrain - Revised Rear Axle Fluid Level/Checking Bulletin No.: 06-04-20-003 Date: October 10, 2006 SERVICE MANUAL UPDATE Subject: Revised Rear Axle Fluid Capacity and Fluid Level Checking Specification Models: 2005-2007 Buick Rainier 2005-2007 Chevrolet TrailBlazer Models 2005-2007 GMC Envoy Models This bulletin is being issued to revise the rear axle fluid capacity and fluid level checking specification in the Rear Axle sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 10860 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Technical Service Bulletins > All Other Service Bulletins for Fluid - Differential: > 06-04-20-003 > Oct > 06 > Drivetrain - Revised Rear Axle Fluid Level/Checking > Page 10861 The information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Specifications > Capacity Specifications Fluid - Differential: Capacity Specifications DIFFERENTIAL FLUID Front .............................................................................................................. .......................................................................................... 0.8 liters (1.7 pints) Rear .......................... .............................................................................................................................................................. ................. 2.0 liters (4.3 pints) NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Specifications > Capacity Specifications > Page 10864 Fluid - Differential: Fluid Type Specifications AXLE LUBRICANT FRONT AXLE SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115. REAR AXLE (EXCEPT SS MODEL) SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115. REAR AXLE (SS MODEL) SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115. With a complete drain and refill add 4 ounces (118 ml) of Limited-Slip Axle Lubricant Additive (GM Part No. U.S. 1052358, in Canada 992694) where required. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Specifications > Page 10865 Fluid - Differential: Diagrams Rear Axle Disassembled Views Rear Axle Disassembled Views 1 - Bolt 2 - Rear Axle Housing Cover 3 - Rear Axle Housing Cover Gasket 4 - Thrust Washer 5 Differential Pinion Gear 6 - Differential Side Gear 7 - Thrust Washer 8 - Differential Pinion Gear 9 Thrust Washer 10 - Differential Side Gear 11 - Thrust Washer 12 - Bearing Cap Bolts 13 - Bearing Cap 14 - Differential Bearing Shim 15 - Differential Bearing and Cup 16 - Differential Ring Gear Bolt 17 - Differential Case 18 - Pinion Gear Shaft 19 - Pinion Gear Bearing Shim 20 - Inner Pinion Bearing and Cup 21 - Rear Axle Housing 22 - Wheel Bearing 23 - Rear Axle Shaft Seal 24 - Brake Backing Plate 25 - Brake Backing Plate Bolt 26 - Brake Caliper 27 - Brake Caliper Bolt 28 - Brake Rotor 29 - Wheel Stud 30 - Rear Axle Shaft 31 - Rear Axle Shaft Lock 32 - Pinion Yoke Nut 33 - Pinion Yoke Washer 34 - Pinion Yoke 35 - Pinion Gear Seal 36 - Outer Pinion Bearing and Cup 37 - Pinion Gear Bearing Spacer 38 - Rear Axle Housing Drain Plug 39 - Rear Axle Housing Fill Plug 40 - Wheel Bearing 41 - Rear Axle Shaft Seal 42 - Rear Axle Shaft Lock 43 - Rear Axle Shaft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Specifications > Page 10866 44 - Wheel Stud 45 - Brake Caliper 46 - Brake Caliper Bolt 47 - Brake Rotor 48 - Brake Backing Plate Bolt 49 - Brake Backing Plate 50 - Rear Axle Vent Hose Connector 51 - Differential Bearing Shim 52 - Differential Bearing and Cup 53 - Bearing Cap 54 - Bearing Cap Bolts 55 - Differential Ring Gear 56 - Differential Pinion Gear Shaft Bolt 57 - Differential Pinion Gear Shaft Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Service and Repair > Lubricant Level Inspection - Rear Drive Axle Fluid - Differential: Service and Repair Lubricant Level Inspection - Rear Drive Axle Lubricant Level Inspection - Rear Drive Axle 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Make sure the vehicle is level. 3. Inspect the rear axle for leaks. Repair as necessary. 4. Clean the area around the rear axle fill plug. 5. Remove the rear axle fill plug. 6. Fabricate a dipstick from a pipe cleaner or similar item. Form the pipe cleaner into the shape of an "L". 7. Insert the pipe cleaner into the fill plug opening with the stem "L" is facing down. Important: Ensure that the pipe cleaner is resting on the bottom threads of the fill hole. 8. Inspect the lubricant level. The lubricant level should be between 0 - 10 mm (0 - 0.4 inch) below the fill plug opening. 9. If the fluid level is low, add lubricant until the level is even with the bottom edge of the fill plug opening. Use the proper fluid. Refer to Fluid and Lubricant Recommendations. 10. Install the rear axle fill plug. Tighten the rear axle fill plug to 33 Nm (24 ft. lbs.). Notice: Refer to Fastener in Service Precautions. 11. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Fluid - Differential > Component Information > Service and Repair > Lubricant Level Inspection - Rear Drive Axle > Page 10869 Fluid - Differential: Service and Repair Lubricant Replacement - Rear Drive Axle Lubricant Replacement - Rear Drive Axle Removal Procedure 1. Clean the area around the rear axle fill plug. 2. Remove the rear axle fill plug. 3. Remove the rear axle cover. 4. Drain the lubricant into a suitable container. Installation Procedure 1. Install the rear axle cover. 2. Inspect the fluid level. 3. Fill the rear axle with axle lubricant. Use the proper fluid. Refer to Capacities - Approximate Fluid. 4. Install the rear axle fill plug. Tighten the rear axle fill plug to 33 Nm (24 ft. lbs.). Notice: Refer to Fastener in Service Precautions. 5. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Bearing, Differential > Component Information > Service and Repair Pinion Bearing: Service and Repair Drive Pinion Bearings Replacement Tools Required ^ J7817 Outer Bearing Race Installer ^ J8092 Universal Driver Handle- 3/4 inch - 10 ^ J8608 Rear Pinion Bearing Race Installer ^ J8611-01 Rear Pinion Bearing Race Installer ^ J8614-01 Flange and Pulley Holding Tool ^ J22912-01Split-Plate Bearing Puller ^ J24433 Pinion Cone and Side Bearing Installer ^ J33782 Pinion Oil Seal Installer ^ J38694 Extension Housing Oil Pump/Seal Installer ^ J45871 Pinion Bearing Remover Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Remove the differential. 3. Remove the drive pinion from the axle. 4. For the 8.0 inch axle, press the bearing off of the pinion using the J22912-01. 5. For the 8.6 inch axle, install the J45871 (1) around the pinion bearing and the J22912-01 (2) in the inverted position around the J45871. 6. Press the bearing off of the pinion using the J45871 and the J22912-01. 7. Remove the shim. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Bearing, Differential > Component Information > Service and Repair > Page 10873 8. Remove the outer pinion bearing cup from the axle housing using a hammer and a brass drift in the slots provided. Move the drift back and forth between one side of the cup and the other in order to work the cups out of the housing evenly. 9. Remove the inner pinion bearing cup from the axle housing using a hammer and a brass drift in the slots provided. Move the drift back and forth between one side of the cup and the other in order to work the cups out of the housing evenly. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Bearing, Differential > Component Information > Service and Repair > Page 10874 1. Install the outer pinion bearing cup using the J7817, 8.0 inch axle, or the J8611-01, 8.6 inch axle (1), and the J8092 (2). 2. Install the inner pinion bearing cup using the J8608 (2) and the J8092 (1). 3. Determine the selective shim thickness for the pinion. 4. Install the selective shim between the inner pinion bearing and the shoulder on the gear. 5. Install the inner pinion bearing using the J24433.Press the bearing on until the cone seats on the pinion shim. 6. Install a new collapsible spacer. 7. Lubricate the pinion bearings with axle lubricant. Use the proper fluid. Refer to Fluid and Lubricant Recommendations. 8. Install the pinion into the axle housing. 9. Install the outer pinion bearing onto the pinion. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Bearing, Differential > Component Information > Service and Repair > Page 10875 10. Install a new pinion oil seal using the J33782, 8.0 inch axle, or the J38694, 8.6 inch axle. 11. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the splines of the pinion yoke. 12. Install the pinion yoke. Align the marks made during removal. 13. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke. 14. Install the washer and a new pinion nut. 15. Install the J8614-01 onto the pinion yoke as shown. 16. Tighten the pinion nut while holding the J8614-01. Tighten the pinion nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings. Notice: Refer to Fastener in Service Precautions. Important: If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Bearing, Differential > Component Information > Service and Repair > Page 10876 17. Measure the rotating torque of the pinion using an inch-pound torque wrench. The rotating torque of the pinion should be 1.0 - 2.3 Nm (10 - 20 inch lbs.) for used bearings, or 1.7 - 3.4 Nm (15 - 30 inch lbs.) for new bearings. 18. If the rotating torque measurement is below 1.0 Nm (10 inch lbs.) for used bearings, or 1.7 Nm (15 inch lbs.) for new bearings, continue to tighten the pinion nut. Tighten the pinion nut, in small increments, as needed, until the torque required in order to rotate the pinion is 1.0 - 2.3 Nm (10 - 20 inch lbs.) for used bearings, or 1.7 3.4 Nm (15 - 30 inch lbs.) for new bearings. 19. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary. 20. Install the differential. 21. Fill the axle with axle lubricant lubricant. Use the proper fluid. 22. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Flange, Differential > Component Information > Service and Repair Pinion Flange: Service and Repair Drive Pinion Flange/Yoke and/or Oil Seal Replacement Tools Required ^ J8614-01 Flange and Pulley Holding Tool ^ J33782 Pinion Oil Seal Installer ^ J38694 Extension Housing Oil Pump/Seal Installer Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. Important: Observe and mark the positions of all the driveline components, relative to the propeller shaft and the axles, prior to disassembly. These components include the propeller shafts, drive axles, pinion flanges, output shafts, etc. Reassemble all the components in the exact places in which you removed the parts. Follow any specifications, torque values, and any measurements made prior to disassembly. 2. Remove the tire and wheel assemblies. 3. Remove the rear brake calipers. 4. Remove the brake rotors. 5. Remove the propeller shaft. 6. Measure the amount of torque required to rotate the pinion. Use an inch-pound torque wrench. Record this measurement for reassembly. This will give the combined preload for the following components: ^ The pinion bearings ^ The pinion oil seal ^ The differential case bearings ^ The axle bearings ^ The axle seals 7. Place an alignment mark between the pinion and the pinion yoke. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Flange, Differential > Component Information > Service and Repair > Page 10880 8. Install the J8614-01 as shown. 9. Remove the pinion nut while holding the J8614-01. 10. Remove the washer. 11. Install the J8614-3 (2) and the J8614-2 (3) into the J8614-01 (1) as shown. 12. Remove the pinion yoke by turning the J8614-3 (3) clockwise while holding the J8614-01 (1).Use a container in order to retrieve the lubricant. 13. Remove the pinion oil seal. Use a suitable seal removal tool. Do not damage the housing. Installation Procedure 1. Install a new pinion oil seal using the J33782, 8.0 inch axle or the J38694 8.6 inch axle. 2. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the splines of the pinion yoke. 3. Install the pinion yoke. Align the marks made during removal. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Flange, Differential > Component Information > Service and Repair > Page 10881 4. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke. Notice: Do not hammer the pinion flange/yoke onto the pinion shaft. Pinion components may be damaged if the pinion flange/yoke is hammered onto the pinion shaft. 5. Install the washer and a new pinion nut. 6. Install the J8614-01 onto the pinion yoke as shown. 7. Tighten the pinion nut while holding the J8614-01. Tighten the nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings. Notice: Refer to Fastener in Service Precautions. Important: If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed. 8. Measure the rotating torque of the pinion. Compare this measurement with the rotating torque recorded during removal. Tighten the nut in small increments, as needed, until the rotating torque is 0.40 - 0.57 Nm (3 - 5 inch lbs.) greater than the rotating torque recorded during removal. 9. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary. 10. Install the propeller shaft. 11. Install the brake rotors. 12. Install the brake calipers. 13. Install the tire and wheel assemblies. 14. Inspect and add axle lubricant to the axle housing, if necessary. 15. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Gear, Differential > Component Information > Service and Repair Pinion Gear: Service and Repair Drive Pinion and Ring Gear Replacement Tools Required ^ J8614-01 Flange and Pulley Holding Tool ^ J22536 Pinion Driver ^ J38694 Extension Housing Oil Pump/Seal Installer Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel assemblies. 3. Remove the brake calipers. 4. Remove the brake rotors. 5. Remove the axle shafts. 6. Remove the differential assembly. 7. Remove the drive pinion yoke and the oil seal. 8. Install the J22536 as shown. Ensure that the J22536 is firmly seated on the pinion. 9. Drive the pinion out using the J22536 and a hammer. Strike the J22536 slowly. Do not let the pinion fall out of the rear axle housing. 10. Remove the collapsible spacer from the pinion. Discard the spacer. 11. Remove the pinion bearings and the cups. 12. Remove the left-hand threaded ring gear bolts. Discard the bolts. 13. Remove the ring gear from the differential. Drive the gear off with a brass drift if necessary. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Gear, Differential > Component Information > Service and Repair > Page 10885 1. Install the ring gear to the differential case. Important: The mating surface of the ring gear and the differential case must be clean and free of burrs before installing the ring gear. 2. Install the new ring gear bolts. Hand start each bolt to ensure that the ring gear is properly installed to the differential case. 3. Tighten the new ring gear bolts alternately and in stages, gradually pulling the ring gear onto the differential case. Tighten the ring gear bolts in sequence to 120 Nm (89 ft. lbs.). Notice: Refer to Fastener in Service Precautions. 4. Install the drive pinion bearing cups. 5. Determine the selective shim thickness for the pinion gear. 6. Install the selective shim onto the pinion. 7. Install the inner pinion bearing onto the pinion. 8. Install a new collapsible spacer. 9. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations. 10. Install the pinion to the axle housing. 11. Install the outer pinion bearing. 12. Install a new pinion oil seal using the J38694. 13. Apply sealant, GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the splines of the pinion yoke. 14. Install the pinion yoke. Align the marks made during removal. 15. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke. 16. Install the washer and a new pinion nut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Pinion Gear, Differential > Component Information > Service and Repair > Page 10886 17. Install the J8614-01 onto the pinion yoke as shown. 18. Tighten the pinion nut while holding the J8614-01. Tighten the pinion nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings. Important: If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed. 19. Measure the rotating torque of the pinion using an inch-pound torque wrench. The rotating torque of the pinion should be 1.0 - 2.3 Nm (10 - 20 inch lbs.) for used bearings or 1.7 - 3.4 Nm (15 - 30 inch lbs.) for new bearings. 20. If the rotating torque measurement is below 1.0 Nm (10 inch lbs.) for used bearings, or 1.7 Nm (15 inch lbs.) for new bearings, continue to tighten the pinion nut. Tighten the pinion nut, in small increments, as needed, until the torque required in order to rotate the pinion is 1.0 - 2.3 Nm (10 - 20 inch lbs.) for used bearings or 1.7 - 3.4 Nm (15 - 30 inch lbs.) for new bearings. 21. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary. 22. Install the differential. 23. Perform a gear tooth contact pattern check on the pinion and the ring gear. Refer to Gear Tooth Contact Pattern Inspection. 24. Install the axle shafts. 25. Install the brake rotors. 26. Install the brake calipers. 27. Install the tire and wheel assemblies. 28. Fill the axle with axle lubricant. Use the proper fluid. 29. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Ring Gear, Differential > Component Information > Service and Repair Ring Gear: Service and Repair Drive Pinion and Ring Gear Replacement Tools Required ^ J8614-01 Flange and Pulley Holding Tool ^ J22536 Pinion Driver ^ J38694 Extension Housing Oil Pump/Seal Installer Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel assemblies. 3. Remove the brake calipers. 4. Remove the brake rotors. 5. Remove the axle shafts. 6. Remove the differential assembly. 7. Remove the drive pinion yoke and the oil seal. 8. Install the J22536 as shown. Ensure that the J22536 is firmly seated on the pinion. 9. Drive the pinion out using the J22536 and a hammer. Strike the J22536 slowly. Do not let the pinion fall out of the rear axle housing. 10. Remove the collapsible spacer from the pinion. Discard the spacer. 11. Remove the pinion bearings and the cups. 12. Remove the left-hand threaded ring gear bolts. Discard the bolts. 13. Remove the ring gear from the differential. Drive the gear off with a brass drift if necessary. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Ring Gear, Differential > Component Information > Service and Repair > Page 10890 1. Install the ring gear to the differential case. Important: The mating surface of the ring gear and the differential case must be clean and free of burrs before installing the ring gear. 2. Install the new ring gear bolts. Hand start each bolt to ensure that the ring gear is properly installed to the differential case. 3. Tighten the new ring gear bolts alternately and in stages, gradually pulling the ring gear onto the differential case. Tighten the ring gear bolts in sequence to 120 Nm (89 ft. lbs.). Notice: Refer to Fastener in Service Precautions. 4. Install the drive pinion bearing cups. 5. Determine the selective shim thickness for the pinion gear. 6. Install the selective shim onto the pinion. 7. Install the inner pinion bearing onto the pinion. 8. Install a new collapsible spacer. 9. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations. 10. Install the pinion to the axle housing. 11. Install the outer pinion bearing. 12. Install a new pinion oil seal using the J38694. 13. Apply sealant, GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the splines of the pinion yoke. 14. Install the pinion yoke. Align the marks made during removal. 15. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke. 16. Install the washer and a new pinion nut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Ring Gear, Differential > Component Information > Service and Repair > Page 10891 17. Install the J8614-01 onto the pinion yoke as shown. 18. Tighten the pinion nut while holding the J8614-01. Tighten the pinion nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings. Important: If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed. 19. Measure the rotating torque of the pinion using an inch-pound torque wrench. The rotating torque of the pinion should be 1.0 - 2.3 Nm (10 - 20 inch lbs.) for used bearings or 1.7 - 3.4 Nm (15 - 30 inch lbs.) for new bearings. 20. If the rotating torque measurement is below 1.0 Nm (10 inch lbs.) for used bearings, or 1.7 Nm (15 inch lbs.) for new bearings, continue to tighten the pinion nut. Tighten the pinion nut, in small increments, as needed, until the torque required in order to rotate the pinion is 1.0 - 2.3 Nm (10 - 20 inch lbs.) for used bearings or 1.7 - 3.4 Nm (15 - 30 inch lbs.) for new bearings. 21. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary. 22. Install the differential. 23. Perform a gear tooth contact pattern check on the pinion and the ring gear. Refer to Gear Tooth Contact Pattern Inspection. 24. Install the axle shafts. 25. Install the brake rotors. 26. Install the brake calipers. 27. Install the tire and wheel assemblies. 28. Fill the axle with axle lubricant. Use the proper fluid. 29. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Seals and Gaskets, Differential > System Information > Service and Repair > Rear Axle Housing Cover and Gasket Replacement Seals and Gaskets: Service and Repair Rear Axle Housing Cover and Gasket Replacement Rear Axle Housing Cover and Gasket Replacement Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Drain the rear axle. 3. Remove the rear axle housing cover bolts (1). 4. Remove the rear axle housing cover (2) from the axle housing. Important: Do not nick or cut the rear axle housing cover gasket. 5. Drain the axle lubricant into a suitable container. Installation Procedure 1. Inspect the rear axle cover gasket for nicks, cuts or damage that may cause the gasket to not seal properly. If any of these conditions exist, replace the gasket. 2. If the gasket is to be reused, clean the rear axle housing cover gasket a suitable cleaner. 3. Clean the rear axle housing cover gasket surface and the rear axle housing gasket surface with a suitable cleaner. 4. Install the rear axle housing cover gasket and the rear axle housing cover (2). Notice: Refer to Fastener in Service Precautions. 5. Install the rear axle housing cover bolts (1). ^ For the 8.0 inch axle, tighten the rear axle housing cover bolts in a crosswise pattern to 30 Nm (20 ft. lbs.). ^ For the 8.6 inch axle, tighten the rear axle housing cover bolts in a crosswise pattern to 25 Nm (18 ft. lbs.). 6. Fill the rear axle with axle lubricant. Use the proper fluid. 7. Lower the vehicle. Refer to Vehicle Lifting. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Seals and Gaskets, Differential > System Information > Service and Repair > Rear Axle Housing Cover and Gasket Replacement > Page 10896 Seals and Gaskets: Service and Repair Rear Axle Shaft Seal and/or Bearing Replacement Rear Axle Shaft Seal and/or Bearing Replacement Tools Required ^ J8092 Universal Driver Handle- 3/4 inch - 10 ^ J21128 Axle Pinion Oil Seal Installer ^ J23690 Bearing Installer ^ J2619-01 Slide Hammer ^ J44685 Rear Axle Seal and Bearing Remover Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel assembly. 3. Remove the rear axle housing cover and the gasket. 4. Remove the axle shaft. 5. Remove the axle shaft seal and/or the bearing from the axle housing using the J44685 (1) and the J2619-01 (2). Installation Procedure 1. Install the axle shaft bearing using the J23690 (1) and the J8092 (2). 2. Drive the axle shaft bearing into the axle housing until the tool bottoms against the tube. 3. Install the axle shaft seal using the J21128. 4. Drive the tool into the bore until the axle shaft seal bottoms flush with the tube. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Seals and Gaskets, Differential > System Information > Service and Repair > Rear Axle Housing Cover and Gasket Replacement > Page 10897 5. Install the axle shaft. 6. Install the rear axle housing cover and the gasket. 7. Install the tire and wheel assembly. 8. Fill the rear axle with axle lubricant. Use the proper fluid. 9. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Seals and Gaskets, Differential > System Information > Service and Repair > Rear Axle Housing Cover and Gasket Replacement > Page 10898 Seals and Gaskets: Service and Repair Drive Pinion Flange/Yoke and/or Oil Seal Replacement Drive Pinion Flange/Yoke and/or Oil Seal Replacement Tools Required ^ J8614-01 Flange and Pulley Holding Tool ^ J33782 Pinion Oil Seal Installer ^ J38694 Extension Housing Oil Pump/Seal Installer Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. Important: Observe and mark the positions of all the driveline components, relative to the propeller shaft and the axles, prior to disassembly. These components include the propeller shafts, drive axles, pinion flanges, output shafts, etc. Reassemble all the components in the exact places in which you removed the parts. Follow any specifications, torque values, and any measurements made prior to disassembly. 2. Remove the tire and wheel assemblies. 3. Remove the rear brake calipers. 4. Remove the brake rotors. 5. Remove the propeller shaft. 6. Measure the amount of torque required to rotate the pinion. Use an inch-pound torque wrench. Record this measurement for reassembly. This will give the combined preload for the following components: ^ The pinion bearings ^ The pinion oil seal ^ The differential case bearings ^ The axle bearings ^ The axle seals 7. Place an alignment mark between the pinion and the pinion yoke. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Seals and Gaskets, Differential > System Information > Service and Repair > Rear Axle Housing Cover and Gasket Replacement > Page 10899 8. Install the J8614-01 as shown. 9. Remove the pinion nut while holding the J8614-01. 10. Remove the washer. 11. Install the J8614-3 (2) and the J8614-2 (3) into the J8614-01 (1) as shown. 12. Remove the pinion yoke by turning the J8614-3 (3) clockwise while holding the J8614-01 (1).Use a container in order to retrieve the lubricant. 13. Remove the pinion oil seal. Use a suitable seal removal tool. Do not damage the housing. Installation Procedure 1. Install a new pinion oil seal using the J33782, 8.0 inch axle or the J38694 8.6 inch axle. 2. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the splines of the pinion yoke. 3. Install the pinion yoke. Align the marks made during removal. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Differential Assembly > Seals and Gaskets, Differential > System Information > Service and Repair > Rear Axle Housing Cover and Gasket Replacement > Page 10900 4. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke. Notice: Do not hammer the pinion flange/yoke onto the pinion shaft. Pinion components may be damaged if the pinion flange/yoke is hammered onto the pinion shaft. 5. Install the washer and a new pinion nut. 6. Install the J8614-01 onto the pinion yoke as shown. 7. Tighten the pinion nut while holding the J8614-01. Tighten the nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings. Notice: Refer to Fastener in Service Precautions. Important: If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed. 8. Measure the rotating torque of the pinion. Compare this measurement with the rotating torque recorded during removal. Tighten the nut in small increments, as needed, until the rotating torque is 0.40 - 0.57 Nm (3 - 5 inch lbs.) greater than the rotating torque recorded during removal. 9. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary. 10. Install the propeller shaft. 11. Install the brake rotors. 12. Install the brake calipers. 13. Install the tire and wheel assemblies. 14. Inspect and add axle lubricant to the axle housing, if necessary. 15. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Bearing > Component Information > Service and Repair Axle Bearing: Service and Repair Rear Axle Shaft Seal and/or Bearing Replacement Tools Required ^ J8092 Universal Driver Handle- 3/4 inch - 10 ^ J21128 Axle Pinion Oil Seal Installer ^ J23690 Bearing Installer ^ J2619-01 Slide Hammer ^ J44685 Rear Axle Seal and Bearing Remover Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel assembly. 3. Remove the rear axle housing cover and the gasket. 4. Remove the axle shaft. 5. Remove the axle shaft seal and/or the bearing from the axle housing using the J44685 (1) and the J2619-01 (2). Installation Procedure 1. Install the axle shaft bearing using the J23690 (1) and the J8092 (2). 2. Drive the axle shaft bearing into the axle housing until the tool bottoms against the tube. 3. Install the axle shaft seal using the J21128. 4. Drive the tool into the bore until the axle shaft seal bottoms flush with the tube. 5. Install the axle shaft. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Bearing > Component Information > Service and Repair > Page 10905 6. Install the rear axle housing cover and the gasket. 7. Install the tire and wheel assembly. 8. Fill the rear axle with axle lubricant. Use the proper fluid. 9. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Axle Shaft > Component Information > Service and Repair Axle Shaft: Service and Repair Rear Axle Shaft Replacement Removal Procedure 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel assembly. 3. Remove the brake caliper. 4. Remove the rear axle housing cover and the gasket. 5. Remove the pinion shaft locking bolt. 6. On axles without a locking differential, remove the pinion shaft. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Axle Shaft > Component Information > Service and Repair > Page 10910 7. On axles with a locking differential, remove the shaft part way. Rotate the case until the pinion shaft touches the housing. 8. On axles with a locking differential, use a screwdriver, or a similar tool, in order to enter the differential case and rotate the C-lock (1) until the C-lock aligns with the thrust block (2). 9. Push the flange of the axle shaft (1) toward the differential. 10. Remove the C-lock from the button end of the axle shaft. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Axle Shaft > Component Information > Service and Repair > Page 10911 11. Remove the axle shaft from the housing. Important: When removing the axle shaft, do not rotate the shaft. Rotating the shaft will mis-align the gears. Mis-aligning the gears will make the installing of the axle shaft difficult. Installation Procedure 1. Install the axle shaft into the rear axle housing. Important: Carefully insert the axle shaft in order to not damage the seal. 2. Slide the axle shaft into place allowing the splines to engage the differential side gear. 3. On axles without a locking differential, place the C-lock on the button end of the axle shaft. 4. On axles with a locking differential, keep the pinion shaft partially withdrawn. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Axle Shaft > Component Information > Service and Repair > Page 10912 5. On axles with a locking differential, place the C-lock (1) on the axle shaft (3) so that the ends are flush with the thrust block (2). 6. Pull the shaft flange outward in order to seat the C-lock in the differential gear. 7. Align the hole in the pinion shaft with the bolt hole in the differential case. 8. Install the new pinion shaft locking bolt. Tighten the pinion shaft locking bolt to 36 Nm (27 ft. lbs.). Notice: Refer to Fastener in Service Precautions. 9. Install the rear axle housing cover and the gasket. 10. Install the brake caliper. 11. Install the tire and wheel assembly. 12. Fill the rear axle with axle lubricant. Use the proper fluid. 13. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement Constant Velocity Joint: Service and Repair Wheel Drive Shaft Inner Joint and Seal Replacement Wheel Drive Shaft Inner Joint and Seal Replacement Tools Required ^ J41048 Drive Axle Swage Ring Clamp Tool ^ J35566 Drive Axle Seal Clamp Plier ^ J8059 Snap Ring Pliers Disassembly Procedure 1. Remove the clamp from the boot with a pair of side cutters. 2. Use a hand grinder to cut through the swage ring. Important: Do not damage the tripot housing (1). 3. Remove the tripot housing (1) and the trilobal tripot bushing (2) from the halfshaft bar (5). 4. Thoroughly degrease the housing (1) and the spider assembly. 5. Discard the tripot bushing. 6. Use 320 grit 3M cloth, or equivalent, to remove any evident corrosion in the transmission sealing surface. 7. Allow the housing (1) and the spider assembly to dry. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10917 8. Compress the tripot boot (4) onto the halfshaft bar (3), away from the spider assembly (1). Important: Handle the tripot spider assembly (1) with care. Tripot balls and needle rollers may separate from the spider trunnion if the tripot balls and needle rollers are not handled carefully. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10918 9. Spread the spacer rings (1, 3) using J8059, or equivalent, to remove the spider assembly (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10919 10. Remove the following items: ^ The spacer ring (1) ^ The spider assembly (2) ^ The second spacer ring (3) ^ The tripot boot (4) 11. Discard the tripot boot and spacer rings. 12. Clean the halfshaft bar. Use a wire brush to remove any rust in the boot mounting area grooves. 13. Inspect the following items: ^ The needle rollers ^ The needle bearings ^ The trunnion 14. Inspect the tripot housing for unusual wear, cracks, or other damage. 15. Use the appropriate kit to replace any damaged parts. Assembly Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10920 1. Position the new swage clamp onto the neck of the boot. Do not swage. 2. Slide the new small swage clamp (2) and the boot (1) to the proper position on the halfshaft bar (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10921 3. Position the neck of the boot in the boot groove on the halfshaft bar. 4. In order to swage the swage clamp, position the inboard end (1) of the halfshaft assembly in J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10922 5. Align the swage clamp (2) within J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10923 6. Place the top half of the J41048 on the bottom half. 7. Inspect to make sure there are no pinch points on the boot before proceeding. 8. Insert the bolts (2). 9. Tighten the bolts (2) by hand until snug. 10. Align the following items: ^ The boot ^ The halfshaft bar ^ The swage clamp Each bolt 180 degrees at a time, using a ratchet wrench. Alternate between each bolt until both sides are bottomed. Notice: Refer to Fastener Notice in Service Precautions. 11. Loosen the bolts. 12. Separate the dies. 13. Inspect the swage clamp for any "lip" deformities. Important: If deformities exist in the swage clamp, place the swage clamp back into J41048. Ensure the swage clamp covers the whole swaging area. Re-swage the swage clamp. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10924 14. Install the convolute retainer over the boot capturing four convolutions. Important: Assemble the joint with the convolute retainer in the correct position. Assemble the joint to meet the specified dimension to avoid boot damage. 15. Install the spacer ring (2) and spider assembly (1) onto the halfshaft bar (3). Important: Ensure that the rings are fully seated. 16. Install the other spacer ring in the groove at the end of the halfshaft bar. Ensure that the rings are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10925 17. Pack the boot and housing with the grease supplied in the kit. The amount of grease supplied in this kit has been pre-measured for this application. 18. Place the large retaining clamp (2) on the boot. 19. Place the housing (1) and the new trilobal tripot bushing over the spider assembly (3). 20. Install the boot onto the trilobal tripot bushing. 21. Inspect the inboard stroke position (see diagram). ^ For male tripot housing assembly: dimension a = 280 mm (11 inch). ^ For female tripot housing assembly: dimension b = 228 mm (9 inch). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10926 22. Secure the large retaining clamp (2) and the boot (3) to the housing (1) using J35566. 23. Remove the convolute retainer from the boot (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10927 Constant Velocity Joint: Service and Repair Wheel Drive Shaft Outer Joint and Seal Replacement Wheel Drive Shaft Outer Joint and Seal Replacement Tools Required ^ J35910 Drive Axle Seal Clamp Pliers ^ J41048 Drive Axle Swage Ring Clamp Tool ^ J8059 Snap Ring Pliers Disassembly Procedure 1. Place the halfshaft in a vise. 2. Place protective covers over the vise jaws. 3. Use a hand grinder to cut through the swage rings (2). Do not damage the outer race. 4. Compress the seal on the halfshaft and away from the CV joint outer race (1). 5. Wipe all grease away from the face of the CV joint. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10928 6. Find the halfshaft retaining snap ring (3), which is located in the inner race (2). 7. Spread the snap ring ears apart using J8059 (or equivalent). 8. Pull the CV joint from the halfshaft (4). 9. Discard the old seal. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10929 10. Place a brass drift against the cage (1). 11. Tap gently on the brass drift in order to tilt the cage. 12. Remove the first ball (2) when the cage tilts. 13. Repeat the previous step to remove all of the balls. 14. Pivot the cage (4) and the inner race 90 degrees to the centerline of the outer race (1). At the same time, align the cage windows (3) with the lands of the outer race (2). 15. Lift out the cage (4) and the inner race. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10930 16. Remove the inner race (1) from the cage (2) by rotating the inner race (1) upward. 17. Thoroughly degrease all of the CV joint parts. 18. Check the outer CV joint assembly for unusual wear, cracks, or other damage. Replace any damaged parts. 19. Clean the halfshaft bar. Use a wire brush to remove any rust in the seal mounting area (grooves). Assembly Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10931 1. Inspect all of the parts for unusual wear, cracks, or other damage. Important: Replace the joint assembly if necessary. 2. Put a light coat of the recommended grease on the inner and the outer race grooves. 3. Insert the inner race (1) into the cage (2) by rotating the inner race downward. 4. Hold the inner race (1) at 90 degrees to the centerline of the cage. 5. Align the lands of the inner race (2) with the windows of the cage (3). 6. Rotate the inner race downward to insert the inner race into the cage. 7. Insert the cage (4) and inner race into the outer race (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10932 8. Place a brass drift against the cage (1). 9. Tap gently on the brass drift in order to tilt the cage (1). 10. Install the first ball (2) when the cage tilts. 11. Repeat previous step to reinstall all of the balls. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10933 12. Pack the CV joint seal and the CV joint assembly with the grease supplied in the kit. The amount of grease supplied in this kit has been pre-measured for this application. 13. Place the new small swage clamp (2) onto the CV joint seal (1). 14. Place the large retaining clamp on the seal (1). 15. Position the small end of the CV joint seal (1) into the joint seal groove (3) on the halfshaft bar. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10934 16. Position the outboard end of the halfshaft assembly (1) in J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10935 17. Align the swage clamp (2) within J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10936 18. Place the top half of the J41048 on the bottom half. 19. Check to make sure there are no pinch points on the seal before proceeding with procedures. 20. Insert the bolts (2). Tighten the bolts (2) by hand until snug. 21. Align the following items: ^ The seal ^ The halfshaft bar ^ The swage clamp Tighten each bolt 180 degrees at a time, using a ratchet wrench. Alternate between each bolt until both sides are bottomed. Notice: Refer to Fastener Notice in Service Precautions. 22. Loosen the bolts. 23. Separate the dies. 24. Check the swage clamp for any "lip" deformities. If the deformities exist, place the swage clamp back into the J41048. 25. Place the retaining snap ring into the CV joint inner race. Important: Ensure that the retaining ring side of the CV joint inner race faces the halfshaft bar (1) before installation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10937 26. Slide the CV joint (2) onto the halfshaft bar (1). Important: The retaining snap ring inside of the inner race engages in the halfshaft bar groove with a click when the CV joint is in the proper position. 27. Pull on the CV joint (2) to verify engagement. 28. Slide the large diameter of the CV joint seal (1), with the large retaining ring (2) in place, over the outside edge of the CV joint outer race (3). 29. Position the lip of the CV joint seal (1) into the groove on the CV joint outer race (3). 30. Manipulate the CV joint seal (1) to remove any excess air. 31. Secure the large retaining clamp (1) to the housing with J35910 (or equivalent), a breaker bar (3), and a torque wrench (2). Torque the large retaining clamp (1) to 176 Nm (130 ft. lbs.). 32. Check the gap dimension on the clamp ear. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement Constant Velocity Joint Boot: Service and Repair Wheel Drive Shaft Inner Joint and Seal Replacement Wheel Drive Shaft Inner Joint and Seal Replacement Tools Required ^ J41048 Drive Axle Swage Ring Clamp Tool ^ J35566 Drive Axle Seal Clamp Plier ^ J8059 Snap Ring Pliers Disassembly Procedure 1. Remove the clamp from the boot with a pair of side cutters. 2. Use a hand grinder to cut through the swage ring. Important: Do not damage the tripot housing (1). 3. Remove the tripot housing (1) and the trilobal tripot bushing (2) from the halfshaft bar (5). 4. Thoroughly degrease the housing (1) and the spider assembly. 5. Discard the tripot bushing. 6. Use 320 grit 3M cloth, or equivalent, to remove any evident corrosion in the transmission sealing surface. 7. Allow the housing (1) and the spider assembly to dry. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10942 8. Compress the tripot boot (4) onto the halfshaft bar (3), away from the spider assembly (1). Important: Handle the tripot spider assembly (1) with care. Tripot balls and needle rollers may separate from the spider trunnion if the tripot balls and needle rollers are not handled carefully. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10943 9. Spread the spacer rings (1, 3) using J8059, or equivalent, to remove the spider assembly (2). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10944 10. Remove the following items: ^ The spacer ring (1) ^ The spider assembly (2) ^ The second spacer ring (3) ^ The tripot boot (4) 11. Discard the tripot boot and spacer rings. 12. Clean the halfshaft bar. Use a wire brush to remove any rust in the boot mounting area grooves. 13. Inspect the following items: ^ The needle rollers ^ The needle bearings ^ The trunnion 14. Inspect the tripot housing for unusual wear, cracks, or other damage. 15. Use the appropriate kit to replace any damaged parts. Assembly Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10945 1. Position the new swage clamp onto the neck of the boot. Do not swage. 2. Slide the new small swage clamp (2) and the boot (1) to the proper position on the halfshaft bar (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10946 3. Position the neck of the boot in the boot groove on the halfshaft bar. 4. In order to swage the swage clamp, position the inboard end (1) of the halfshaft assembly in J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10947 5. Align the swage clamp (2) within J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10948 6. Place the top half of the J41048 on the bottom half. 7. Inspect to make sure there are no pinch points on the boot before proceeding. 8. Insert the bolts (2). 9. Tighten the bolts (2) by hand until snug. 10. Align the following items: ^ The boot ^ The halfshaft bar ^ The swage clamp Each bolt 180 degrees at a time, using a ratchet wrench. Alternate between each bolt until both sides are bottomed. Notice: Refer to Fastener Notice in Service Precautions. 11. Loosen the bolts. 12. Separate the dies. 13. Inspect the swage clamp for any "lip" deformities. Important: If deformities exist in the swage clamp, place the swage clamp back into J41048. Ensure the swage clamp covers the whole swaging area. Re-swage the swage clamp. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10949 14. Install the convolute retainer over the boot capturing four convolutions. Important: Assemble the joint with the convolute retainer in the correct position. Assemble the joint to meet the specified dimension to avoid boot damage. 15. Install the spacer ring (2) and spider assembly (1) onto the halfshaft bar (3). Important: Ensure that the rings are fully seated. 16. Install the other spacer ring in the groove at the end of the halfshaft bar. Ensure that the rings are fully seated. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10950 17. Pack the boot and housing with the grease supplied in the kit. The amount of grease supplied in this kit has been pre-measured for this application. 18. Place the large retaining clamp (2) on the boot. 19. Place the housing (1) and the new trilobal tripot bushing over the spider assembly (3). 20. Install the boot onto the trilobal tripot bushing. 21. Inspect the inboard stroke position (see diagram). ^ For male tripot housing assembly: dimension a = 280 mm (11 inch). ^ For female tripot housing assembly: dimension b = 228 mm (9 inch). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10951 22. Secure the large retaining clamp (2) and the boot (3) to the housing (1) using J35566. 23. Remove the convolute retainer from the boot (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10952 Constant Velocity Joint Boot: Service and Repair Wheel Drive Shaft Outer Joint and Seal Replacement Wheel Drive Shaft Outer Joint and Seal Replacement Tools Required ^ J35910 Drive Axle Seal Clamp Pliers ^ J41048 Drive Axle Swage Ring Clamp Tool ^ J8059 Snap Ring Pliers Disassembly Procedure 1. Place the halfshaft in a vise. 2. Place protective covers over the vise jaws. 3. Use a hand grinder to cut through the swage rings (2). Do not damage the outer race. 4. Compress the seal on the halfshaft and away from the CV joint outer race (1). 5. Wipe all grease away from the face of the CV joint. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10953 6. Find the halfshaft retaining snap ring (3), which is located in the inner race (2). 7. Spread the snap ring ears apart using J8059 (or equivalent). 8. Pull the CV joint from the halfshaft (4). 9. Discard the old seal. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10954 10. Place a brass drift against the cage (1). 11. Tap gently on the brass drift in order to tilt the cage. 12. Remove the first ball (2) when the cage tilts. 13. Repeat the previous step to remove all of the balls. 14. Pivot the cage (4) and the inner race 90 degrees to the centerline of the outer race (1). At the same time, align the cage windows (3) with the lands of the outer race (2). 15. Lift out the cage (4) and the inner race. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10955 16. Remove the inner race (1) from the cage (2) by rotating the inner race (1) upward. 17. Thoroughly degrease all of the CV joint parts. 18. Check the outer CV joint assembly for unusual wear, cracks, or other damage. Replace any damaged parts. 19. Clean the halfshaft bar. Use a wire brush to remove any rust in the seal mounting area (grooves). Assembly Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10956 1. Inspect all of the parts for unusual wear, cracks, or other damage. Important: Replace the joint assembly if necessary. 2. Put a light coat of the recommended grease on the inner and the outer race grooves. 3. Insert the inner race (1) into the cage (2) by rotating the inner race downward. 4. Hold the inner race (1) at 90 degrees to the centerline of the cage. 5. Align the lands of the inner race (2) with the windows of the cage (3). 6. Rotate the inner race downward to insert the inner race into the cage. 7. Insert the cage (4) and inner race into the outer race (1). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10957 8. Place a brass drift against the cage (1). 9. Tap gently on the brass drift in order to tilt the cage (1). 10. Install the first ball (2) when the cage tilts. 11. Repeat previous step to reinstall all of the balls. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10958 12. Pack the CV joint seal and the CV joint assembly with the grease supplied in the kit. The amount of grease supplied in this kit has been pre-measured for this application. 13. Place the new small swage clamp (2) onto the CV joint seal (1). 14. Place the large retaining clamp on the seal (1). 15. Position the small end of the CV joint seal (1) into the joint seal groove (3) on the halfshaft bar. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10959 16. Position the outboard end of the halfshaft assembly (1) in J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10960 17. Align the swage clamp (2) within J41048. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10961 18. Place the top half of the J41048 on the bottom half. 19. Check to make sure there are no pinch points on the seal before proceeding with procedures. 20. Insert the bolts (2). Tighten the bolts (2) by hand until snug. 21. Align the following items: ^ The seal ^ The halfshaft bar ^ The swage clamp Tighten each bolt 180 degrees at a time, using a ratchet wrench. Alternate between each bolt until both sides are bottomed. Notice: Refer to Fastener Notice in Service Precautions. 22. Loosen the bolts. 23. Separate the dies. 24. Check the swage clamp for any "lip" deformities. If the deformities exist, place the swage clamp back into the J41048. 25. Place the retaining snap ring into the CV joint inner race. Important: Ensure that the retaining ring side of the CV joint inner race faces the halfshaft bar (1) before installation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Axle Shaft Assembly > Constant Velocity Joint Boot > Component Information > Service and Repair > Wheel Drive Shaft Inner Joint and Seal Replacement > Page 10962 26. Slide the CV joint (2) onto the halfshaft bar (1). Important: The retaining snap ring inside of the inner race engages in the halfshaft bar groove with a click when the CV joint is in the proper position. 27. Pull on the CV joint (2) to verify engagement. 28. Slide the large diameter of the CV joint seal (1), with the large retaining ring (2) in place, over the outside edge of the CV joint outer race (3). 29. Position the lip of the CV joint seal (1) into the groove on the CV joint outer race (3). 30. Manipulate the CV joint seal (1) to remove any excess air. 31. Secure the large retaining clamp (1) to the housing with J35910 (or equivalent), a breaker bar (3), and a torque wrench (2). Torque the large retaining clamp (1) to 176 Nm (130 ft. lbs.). 32. Check the gap dimension on the clamp ear. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Seals and Gaskets, Drive Axles > System Information > Technical Service Bulletins > Customer Interest for Seals and Gaskets: > 08-07-30-009B > May > 08 > A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks Seals and Gaskets: Customer Interest A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Seals and Gaskets, Drive Axles > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > 08-07-30-009B > May > 08 > A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks Seals and Gaskets: All Technical Service Bulletins A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Seals and Gaskets, Drive Axles > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10976 Seals and Gaskets: By Symptom Technical Service Bulletin # 08-07-30-009B Date: 080501 A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Technical Service Bulletin # 08-07-30-009B Date: 080501 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Seals and Gaskets, Drive Axles > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10977 A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Technical Service Bulletin # 08-07-30-009B Date: 080501 A/T - 4T80E, Slips in Gear/L/H Axle Seal Leaks TECHNICAL Bulletin No.: 08-07-30-009B Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Seals and Gaskets, Drive Axles > System Information > Technical Service Bulletins > All Technical Service Bulletins for Seals and Gaskets: > Page 10978 Date: May 01, 2008 Subject: HYDRA-MATIC(R) Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part) Models: 2001-2008 GM Passenger Cars with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO - MH1) Supercede: This bulletin is being updated to revise the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009A (Section 07 - Transmission/Transaxle). Condition Some customers may comment on a transmission oil leak and/or that the transmission slips in gear. Cause An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axe sea. Correction Important: DO NOT replace the transmission for above concerns. Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle - 4T80-E Transmission Off-Vehicle Repair Instructions for the replacement of the third clutch housing in SI. Parts Information Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Wheel Bearing > Component Information > Testing and Inspection Step 1 - Step 7 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Wheel Bearing > Component Information > Testing and Inspection > Page 10982 Wheel Bearing: Service and Repair Wheel Hub, Bearing, and Seal Replacement (RWD) Removal Procedure 1. Raise and support the vehicle. 2. Remove the tire and wheel. 3. Remove the brake rotor. 4. Remove the ABS sensor mounting bolt from the wheel hub and bearing. 5. Remove the ABS sensor from the wheel hub and bearing. 6. Remove the wheel hub and bearing to the steering knuckle mounting bolts. 7. Remove the wheel hub and bearing from the steering knuckle. 8. Remove the splash shield from the steering knuckle. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Wheel Bearing > Component Information > Testing and Inspection > Page 10983 1. Install the splash shield to the steering knuckle. Align the splash shield to the steering knuckle threaded holes. 2. Install the wheel hub and bearing to the steering knuckle. Align the threaded holes. 3. Install the wheel hub and bearing to the steering knuckle mounting bolts. Tighten the wheel hub and bearing mounting bolts to 105 Nm (77 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Install the ABS sensor to the wheel hub and bearing. 5. Install the ABS sensor mounting bolt to the wheel hub and bearing. Tighten the ABS sensor to the wheel hub and bearing mounting bolt to 18 Nm (13 ft. lbs.). 6. Install the brake rotor. 7. Install the tire and wheel. 8. Lower the Vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive Axles, Bearings and Joints > Wheel Hub > Axle Nut > Component Information > Specifications Axle Nut: Specifications Drive Axle Nut Tighten the drive axle nut to ........................................................................................................................................................... 140 Nm (103 ft. lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive/Propeller Shafts, Bearings and Joints > Universal Joint, Drive/Propeller Shaft > Component Information > Service and Repair > Universal Joint Replacement - Nylon Injected Ring Universal Joint: Service and Repair Universal Joint Replacement - Nylon Injected Ring Universal Joint Replacement - Nylon Injected Ring Tools Required ^ ^ J9522-3 U Joint Bearing Separator ^ J9522-5 U Joint Bearing Spacer Remover Disassembly Procedure 1. Support the propeller shaft in a line horizontal with the table of a press. Notice: Never clamp propeller shaft tubing in a vise. Clamping could dent or deform the tube causing an imbalance or unsafe condition. Always clamp on one of the yokes and support the shaft horizontally. Avoid damaging the slip yoke sealing surface. Nicks may damage the bushing or cut the lip seal. 2. Mark the propeller shaft as to which end is the transmission end and which end goes to the rear axle. 3. Place the universal joint so that the lower ear of the yoke is supported on a 30 mm (1 1/8 inch) socket. 4. In order to shear the plastic retaining ring on the bearing cup, place J9522-3 on the open horizontal bearing cups. Press the lower bearing cup out of the yoke ear. 5. If you do not completely remove the bearing cup, lift the cross and insert J9522-5 between the seal and the bearing cup you are removing. Continue to press the bearing cup out of the yoke. 6. Rotate the propeller shaft. Press the opposite bearing cup out of the yoke. 7. Mark the orientation of the slip yoke to the tube for proper reassembly. 8. Remove the cross from the yoke. 9. Remove the remaining universal joint parts from the yoke. If you are replacing the front universal joint, remove the bearing cups in the slip yoke in the same manner. 10. Inspect the retaining ring grooves for plastic. 11. Inspect the bearing cup bores in the yoke ears for burrs or imperfections. 12. Clean the remains of the sheared plastic bearing retainers from the grooves in the yoke. 13. The sheared plastic may prevent the bearing cups from pressing into place and thus prevent the bearing retainers from properly seating. Assembly Procedure 1. Remove the bearing cups from the universal joint. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive/Propeller Shafts, Bearings and Joints > Universal Joint, Drive/Propeller Shaft > Component Information > Service and Repair > Universal Joint Replacement - Nylon Injected Ring > Page 10993 2. Assemble 1 bearing cup part way into 1 side of the yoke. 3. Turn the yoke ear toward the bottom. 4. Assemble the cross into the yoke so the trunnion seats freely into the bearing cup. 5. With the trunnion seated in the bearing cup, press the bearing cup into the yoke until the bearing cup is flush with the yoke ear. 6. Assemble the opposite bearing cup part way into the yoke ear. 7. Ensure that the trunnions start straight and true into both bearing cups. 8. Press the opposite bearing cup into the yoke ear while working the cross all the time in order to inspect for a free unbinding movement of the trunnions in the bearing cups. 9. Press the bearing cup into the yoke until the bearing retainer groove clears the inside of the yoke. Important: If there seems to be a hang-up or binding, stop pressing, and inspect the needle bearings for misalignment in the bearing cup. 10. Assemble the bearing retainer in the retainer groove. 11. Continue pressing until you can snap both retainers into place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive/Propeller Shafts, Bearings and Joints > Universal Joint, Drive/Propeller Shaft > Component Information > Service and Repair > Universal Joint Replacement - Nylon Injected Ring > Page 10994 12. If seating the retainer is difficult, spring the yoke slightly with a firm blow from a dead blow hammer. 13. It may be necessary to lubricate the snap ring with a slight amount of chassis grease so the snap ring seats in the bearing cup groove. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive/Propeller Shafts, Bearings and Joints > Universal Joint, Drive/Propeller Shaft > Component Information > Service and Repair > Universal Joint Replacement - Nylon Injected Ring > Page 10995 Universal Joint: Service and Repair Universal Joint Replacement - External Snap Ring Universal Joint Replacement - External Snap Ring Tools Required ^ J9522-3 U-Joint Bearing Separator ^ J9522-5 U-Joint Bearing Spacer Remover Disassembly Procedure Notice: Never clamp propeller shaft tubing in a vise. Clamping could dent or deform the tube causing an imbalance or unsafe condition. Always clamp on one of the yokes and support the shaft horizontally. Avoid damaging the slip yoke sealing surface. Nicks may damage the bushing or cut the lip seal. 1. Support the propeller shaft in a line horizontal with the table of a press. 2. Mark the propeller shaft in order to show which end connects to the transmission and which end goes to the rear axle. 3. Disassemble the snap rings by pinching the ends together with a pair of pliers. 4. If the ring does not readily snap out of the groove in the yoke, tap the end of the cup lightly in order to relieve the pressure from the ring. 5. Place the universal joint so that the lower ear of the yoke is supported on a 30 mm (1-1/8 inch) hex head socket or a 27 mm (1-1/16 inch) socket. 6. Place J9522-3 on the open horizontal bearing cups. Press the lower bearing cup out of the yoke ear. 7. If you do not completely remove the bearing cup, lift the cross and insert J9522-5 between the seal and the bearing cup you are removing. Continue pressing the bearing cup out of the yoke. 8. Rotate the propeller shaft. Press the opposite bearing cup out of the yoke. 9. Mark the orientation of the slip yoke to the tube for proper reassembly. 10. Remove the cross from the yoke. 11. Remove the remaining universal joint parts from the yoke. 12. If you are replacing the front universal joint, remove the bearing cups in the slip yoke in the same manner. 13. Inspect the retaining ring grooves for dirt, corrosion, or pieces of the old ring. 14. Inspect the bearing cup bores for burrs or imperfections. 15. Clean the retaining ring grooves. Corrosion, dirt, rust, or pieces of the old retaining ring may prevent the bearing cups from pressing into place or prevent the bearing retainers from properly seating. Assembly Procedure 1. Remove the bearing cups from the universal joint. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive/Propeller Shafts, Bearings and Joints > Universal Joint, Drive/Propeller Shaft > Component Information > Service and Repair > Universal Joint Replacement - Nylon Injected Ring > Page 10996 2. Assemble 1 bearing cup part way into 1 side of the yoke. Turn the yoke ear toward the bottom. 3. Assemble the cross into the yoke so that the trunnion seats freely into the bearing cup. 4. With the trunnion seated in the bearing cup, press the bearing cup into the yoke until the bearing cup is flush with the yoke ear. 5. Install the opposite bearing cup part way into the yoke ear. 6. Ensure that the trunnions start straight and true into both bearing cups. 7. Press the opposite bearing cup into the yoke ear while working the cross all the time in order to inspect for free unbinding movement of the trunnions in the bearing cups. 8. Press the bearing cup into the yoke until the bearing cup retainer groove is visible over the top of the bearing cup. Important: If there seems to be a hang up or binding, stop pressing. Inspect the needle bearings for misalignment in the bearing cup. 9. Assemble the bearing retainer in the retainer groove. 10. Continue pressing until both retainers can be snapped into place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Drive/Propeller Shafts, Bearings and Joints > Universal Joint, Drive/Propeller Shaft > Component Information > Service and Repair > Universal Joint Replacement - Nylon Injected Ring > Page 10997 11. If the retainer is difficult to seat, the yoke can be sprung slightly with a firm blow from a dead blow hammer. 12. It may be necessary to lubricate the snap ring with a slight amount of chassis grease so that the snap ring seats in the bearing cup groove. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Flex Plate > Component Information > Specifications Flex Plate: Specifications Flywheel Bolts - First Pass .................................................................................................................. ..................................................... 20 Nm (15 ft. lbs.) Flywheel Bolts - Second Pass ......................... .......................................................................................................................................... 50 Nm (37 ft. lbs.) Flywheel Bolts - Final Pass ...................................................................................................... ............................................................... 100 Nm (74 ft. lbs.) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Flex Plate > Component Information > Specifications > Page 11001 Flex Plate: Service and Repair Engine Flywheel Replacement Removal Procedure 1. Remove the transmission. Important: Note the position and direction of the engine flywheel before removal. 2. Remove the engine flywheel bolts. 3. Remove the engine flywheel. 4. Clean and inspect the engine flywheel. Refer to Engine Flywheel Cleaning and Inspection. Installation Procedure Important: The flywheel does not use a locating pin for alignment and will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the engine flywheel bolts. This procedure requires a three stage tightening process. 1. Install the engine flywheel to the crankshaft. 2. Apply threadlock to the threads of the flywheel bolts. Refer to Sealers, Adhesives, and Lubricants for the correct part number. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Flex Plate > Component Information > Specifications > Page 11002 Notice: Refer to Fastener Notice in Service Precautions. 3. Install the engine flywheel bolts. 1. Tighten the bolts a first pass in sequence to 20 Nm (15 ft. lbs.). 2. Tighten the bolts a second pass in sequence to 50 Nm (37 ft. lbs.). 3. Tighten the bolts a final pass in sequence to 100 Nm (74 ft. lbs.). 4. Install the transmission. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Lamps and Indicators - Transmission and Drivetrain > Lamps and Indicators - A/T > Shift Indicator > Component Information > Description and Operation Shift Indicator: Description and Operation PRND321 DISPLAY The instrument panel cluster (IPC) displays the selected gear position as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the gear position. The PRND321 display blanks if: - The PCM detects a malfunction in the transmission range switch circuit. - The IPC detects a loss of class 2 communications with the PCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Manual Transmission/Transaxle > Component Information > Technical Service Bulletins > Manual Transmission - M/T Operating Characteristics Manual Transmission/Transaxle: Technical Service Bulletins Manual Transmission - M/T Operating Characteristics INFORMATION Bulletin No.: 03-07-29-004G Date: December 15, 2010 Subject: Manual Transmission Operating Characteristics Models: 2011 and Prior GM Passenger Cars and Light Duty Trucks (Including Saturn) 2009 and Prior Chevrolet and GMC Medium Duty Trucks 2006-2010 HUMMER H3 with Manual Transmission Supercede: This bulletin is being revised to add the 2011 model year and to add Cold Operation information. Please discard Corporate Bulletin Number 03-07-29-004F (Section 07 Transmission/Transaxle). Important Even though this bulletin attempts to cover operating characteristics of manual transmissions, it cannot be all inclusive. Be sure to compare any questionable concerns to a similar vehicle and if possible, with similar mileage. Even though many of the conditions are described as characteristics and may not be durability issues, GM may attempt to improve specific issues for customer satisfaction. The purpose of this bulletin is to assist in identifying characteristics of manual transmissions that repair attempts will not change. The following are explanations and examples of conditions that will generally occur in all manual transmissions. All noises will vary between transmissions due to build variation, type of transmission (usually the more heavy duty, the more noise), type of flywheel and clutch, level of insulation, etc. Basic Information Many transmission noises are created by the firing pulses of the engine. Each firing pulse creates a sudden change in angular acceleration at the crankshaft. These changes in speed can be reduced with clutch damper springs and dual mass flywheels. However, some speed variation will make it through to the transmission. This can create noise as the various gears will accel and decel against each other because of required clearances. Cold Operation Manual transmission operation will be affected by temperature because the transmission fluid will be thicker when cold. The thicker fluid will increase the amount of force needed to shift the transmission when cold. The likelihood of gear clash will also increase due to the greater time needed for the synchronizer assembly to perform its function. Therefore when the transmission is cold, or before it has reached operating temperature, quick, hard shifts should be avoided to prevent damage to the transmission. Gear Rattle Rattling or grinding (not to be confused with a missed shift type of grinding, also described as a combustion knock type of noise) type noises usually occur while operating the engine at low RPMs (lugging the engine). This can occur while accelerating from a stop (for example, a Corvette) or while operating at low RPMs while under a load (for example, Kodiak in a lower gear and at low engine speed). Vehicles equipped with a dual-mass flywheel (for example, a 3500 HD Sierra with the 6-speed manual and Duramax(R)) will have reduced noise levels as compared to vehicles without (for example, a 4500 Kodiak with the 6-speed manual and Duramax(R)). However, dual-mass flywheels do not eliminate all noise. Neutral Rattle There are often concerns of rattle while idling in neutral with the clutch engaged. This is related to the changes in angular acceleration described earlier. This is a light rattle, and once again, vehicles with dual mass flywheels will have reduced noise. If the engine is shut off while idling in neutral with the clutch engaged, the sudden stop of the engine will create a rapid change in angular acceleration that even dual mass flywheels cannot compensate. Because of the mass of all the components, this will create a noise. This type of noise should not be heard if the clutch is released (pedal pushed to the floor). Backlash Backlash noise is created when changing engine or driveline loading. This can occur when accelerating from a stop, coming to a stop, or applying and releasing the throttle (loading and unloading the driveline). This will vary based on vehicle type, build variations, driver input, vehicle loading, etc. and is created from the necessary clearance between all of the mating gears in the transmission, axle(s) and transfer case (if equipped). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Manual Transmission/Transaxle > Component Information > Technical Service Bulletins > Manual Transmission - M/T Operating Characteristics > Page 11012 Shift Effort Shift effort will vary among different style transmissions and synchronizer designs. Usually the more heavy duty the transmission, the higher the shift effort because of the increased mass of the components. Shift effort can also be higher in cold weather because the fluid will be thicker. Medium duty transmissions will not shift as quickly as a Corvette transmission. To reduce shift effort, do not attempt to rush the shift - allow the synchronizers to work as designed. Shifting harder will only increase the chance of rushing past the synchronizer leading to grinding while shifting. Non-Synchronized Gears Some light duty truck transmissions in 1st gear (creeper-gear) and reverse gears in various transmissions, along with all gears in some medium duty transmissions, may be non-synchronized. This means there is not a mechanism to match input and output shaft speeds to allow for a smooth shift. This function is left up to the driver. This can be noticed if a shift into 1st or reverse is attempted while the vehicle is rolling or before the input shaft stops rotating leading to a gear grind. The grinding can be reduced by coming to a complete stop and pausing for a moment before shifting into the 1st or reverse gear. Some slight grinding can be expected. In medium duty non-synchronized transmissions, the driver must match input shaft (engine) speed to output shaft (driveshaft) speed with every shift. This can be accomplished by double clutching, or by using other methods. If the driver is not able to perform this function properly, there will be gear grinding with each improperly completed shift. Driver training may be required to correct this condition. Clutch brakes are used in medium duty non-synchronized transmissions to allow a shift into gear at a stop. The clutch brake is used to stop the input shaft from spinning, allowing a shift into gear at a stop without grinding. The clutch brake is activated by pressing the clutch pedal all the way to the floor. When the clutch brake is used, it is possible to have a blocked shift with the vehicle stationary. If this occurs, engage the clutch slightly to rotate the input gear to allow the shift. The clutch brake is intended to only be used while at a stop. Care must be taken to not activate the clutch brake while shifting between gears. This could lead to excessive grinding or a blocked or missed shift. Skip Shift Currently, the Cadillac CTS-V, Pontiac GTO, Chevrolet Corvette and Camaro SS (other models may follow) equipped with the 6-speed manual transmission have a feature referred to as a "skip-shift." This feature only allows a shift from 1st to 4th gear when the indicator lamp is illuminated on the dash. Dealers cannot disable this feature as it was established to help meet fuel economy standards. The conditions for this feature are: engine coolant at normal operating temperature, vehicle speed of 24-31 km/h (15-19 mph), 21% or less throttle being used (refer to Service Information or the Owner Manual for more details.) Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Engine, A/T Controls Shared Diagnostic Trouble Codes Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11019 Control Module: Locations Automatic Transmission Electronic Component Views Transmission Control Module (TCM) 1 - Engine Harness 2 - Transmission Control Module (TCM) 3 - Transmission Control Module (TCM) Connector Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11020 Control Module: Diagrams Automatic Transmission Related Connector End Views Transmission Control Module (TCM), Engine Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11021 Transmission Control Module (TCM), Engine Side (5.3L and 6.0L) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11022 Control Module: Service and Repair Transmission Control Module (TCM) Replacement Service of the transmission control module (TCM) should consist of reprogramming of the TCM. If the diagnostic procedures call for the TCM to be replaced, the replacement TCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty TCM and install the new service TCM. The replacement TCM must be programmed. Removal Procedure 1. Disconnect the negative battery cable. 2. Disconnect the cooling fan electrical connector for additional clearance while removing the TCM. 3. Depress the engine control module (ECM)/TCM cover retainers (2). 4. Remove the ECM/TCM cover from the ECM/TCM bracket (1). 5. Disconnect the TCM electrical connector (1) from the TCM (2) Notice: Refer to Handling ESD Sensitive Parts Notice. Important: It is not necessary to disconnect the TCM electrical connectors in order to remove the TCM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. Important: Remove any debris from around the TCM connector surfaces before servicing the TCM. Inspect the TCM module connector gaskets when diagnosing or replacing the TCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the TCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11023 6. Release the bracket TCM retainer (1). 7. Tilt the TCM (2) away from the ECM/TCM bracket. 8. Remove the TCM (1) from the TCM bracket (2). 9. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the ECM (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11024 10. Remove the ECM/TCM bracket retaining bolts (2). 11. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. Tighten the bolts to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11025 4. If the ECM was previously removed from the ECM/TCM bracket (2), install the ECM (3). 5. Insert the TCM (1) into the retaining slot of the ECM/TCM bracket (2). 6. Secure the TCM (2) to the ECM/TCM mounting bracket ensuring the TCM retaining tab (1) is fully engaged. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11026 7. Connect the ECM electrical connector (1) to the TCM (2) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. 12. If the TCM was replaced the replacement TCM must be programmed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications TFP Manual Valve Position Switch Logic Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11032 Fluid Pressure Sensor/Switch: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11033 Fluid Pressure Sensor/Switch: Diagrams Automatic Transmission Inline 20-Way Connector End View Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11034 Fluid Pressure Sensor/Switch: Service and Repair Valve Body and Pressure Switch Replacement Removal Procedure 1. Ensure that removal of the valve body is necessary before proceeding. ^ Important: The following components can be serviced without removing the valve body from the transmission: The torque converter clutch solenoid (1) ^ The pressure control solenoid (2) ^ The internal wiring harness (3) ^ The 2-3 shift solenoid (4) ^ The 1-2 shift solenoid (5) ^ The transmission fluid pressure manual valve position switch (6) ^ The 3-2 shift solenoid (7) ^ The torque converter clutch pulse width modulation (TCC PWM) solenoid (8) 2. Remove the fluid level indicator. 3. Raise the vehicle. 4. Remove the oil pan, gasket, and filter. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11035 6. Remove the fluid indicator stop bracket bolt (2). 7. Remove the fluid indicator bracket (1). 8. Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible. 9. Remove the TCC PWM solenoid (1) in order to access the TCC solenoid retaining bolts. 10. Remove the TCC solenoid retaining bolts. 11. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body. 12. Reposition the harness to the side of the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11036 13. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. 14. Remove the transmission fluid pressure switch. 15. Inspect the transmission fluid pressure switch for damage or debris. 16. Remove the manual detent spring retaining bolt. 17. Remove the manual detent spring. 18. Inspect the manual detent spring for cracks or damage. 19. Remove the remaining control valve body bolts. Important: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11037 20. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. Installation Procedure Ball Check Valves 1. Install the checkballs (1-7) in the valve body. 2. Install the control valve body to the transmission case while simultaneously connecting the manual valve link to the manual valve. 3. Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2). 4. Install one bolt (M6 X 1.0 X 47.5) hand tight in the center (1) of the valve body to hold it in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11038 5. Do not install the transmission fluid indicator stop bracket and bolt at this time. Install but do not tighten the control valve body bolts which retain only the valve body directly. Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following: ^ M6 X 1.0 X 65.0 (1) ^ M6 X 1.0 X 54.4 (2) ^ M6 X 1.0 X 47.5 (3) ^ M6 X 1.0 X 35.0 (4) ^ M8 X 1.0 X 20.0 (5) ^ M6 X 1.0 X 12.0 (6) ^ M6 X 1.0 X 18.0 (7) Important: When installing bolts throughout this procedure, be sure to use the correct bolt size and length in the correct location as specified. 6. Install the manual detent spring. 7. Install but do not tighten the manual detent spring retaining bolt. 8. Install the transmission fluid pressure switch. 9. Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11039 10. Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows. Tighten the control valve body bolts (in sequence) to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation. 11. Ensure that the manual detent spring is aligned properly with the detent lever. Tighten the manual detent spring bolt to 31 Nm (23 ft. lbs.). 12. Install the TCC solenoid with a new O-ring seal to the valve body. 13. Install the TCC solenoid bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11040 Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). 14. Install the internal wiring harness to the valve body. The internal wiring harness has a tab (1) on the edge of the conduit. 15. Place the tab between the valve body and the pressure switch in the location shown (2). Press the harness into position on the valve body bolt bosses (1, 3). 16. Install the TCC PWM solenoid (1) to the control valve body. 17. Install the TCC PWM solenoid retainer (2). 18. Install the transmission fluid indicator stop bracket (1) and bolt (2). Tighten the transmission fluid indicator stop bracket bolt to 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11041 19. Connect the internal wiring harness electrical connectors to the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) 20. Install the transmission oil pan and filter. 21. Lower the vehicle. 22. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 23. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11045 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11046 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11047 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11048 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations Transmission Speed Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 11052 Vehicle Speed Sensor (VSS) 1 - VSS Sensor 2 - Transfer Case Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 11053 Transmission Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Input Speed Sensor (ISS) Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Temperature Sensor/Switch, A/T > Component Information > Specifications Transmission Fluid Temperature (TFT) Sensor Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams Pressure Regulating Solenoid: Diagrams Automatic Transmission Inline 20-Way Connector End View Pressure Control (PC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 11063 Pressure Regulating Solenoid: Service and Repair Pressure Regulator Replacement Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and filter. 3. Compress the reverse boost valve sleeve into the bore of the oil pump to release tension on the reverse boost valve retaining ring. 4. Remove the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 5. Remove the reverse boost valve sleeve (5) and the reverse boost valve (4). 6. Remove the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 7. Remove the pressure regulator valve (1). Installation Procedure 1. Install the pressure regulator valve (1). 2. Install the pressure regulator isolator spring (3) and the pressure regulator valve spring (2). 3. Install the reverse boost valve (4) in the reverse boost valve sleeve (5). 4. Install the reverse boost valve (4) and sleeve (5) in the oil pump cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Pressure Regulating Solenoid, A/T > Component Information > Diagrams > Page 11064 5. Compress the reverse boost valve sleeve into the bore of the oil pump to expose the retaining ring slot. 6. Install the reverse boost valve retaining ring, then slowly release tension on the reverse boost valve sleeve. 7. Install the transmission oil filter and pan. 8. Lower the vehicle. 9. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 10. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Automatic Transmission/Transaxle/Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available Shift Interlock Solenoid: Technical Service Bulletins A/T - Shift Lock Control Actuator Available Bulletin No.: 05-07-129-001B Date: February 16, 2007 INFORMATION Subject: Automatic Transmission Shift Lock Control Actuator Available for Service Use Models: 2004-2007 Buick Rainier 2002-2007 Chevrolet TrailBlazer 2002-2006 Chevrolet TrailBlazer EXT 2003-2006 Chevrolet SSR 2002-2007 GMC Envoy 2002-2006 GMC Envoy XL 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada 2003-2007 HUMMER H2 2005-2007 Saab 9-7X Supercede: This bulletin is being revised to update the model years and add the SSR. Please discard Corporate Bulletin Number 05-07-129-001A (Section 07 - Transmission/Transaxle). The automatic transmission shift lock control actuator is now available for service as a separate part. The actuator was formerly available only as part of the entire shifter assembly. DO NOT replace the shifter assembly if the shift lock control actuator requires replacement. Please refer to the Automatic Transmission Shift Lock Control Actuator Replacement procedure in the Automatic Transmission sub-section of the Service Information. Parts Information Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > A/T - Shift Lock Control Actuator Available > Page 11069 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 11070 Shift Interlock Solenoid: Locations Shift Lock Control Component Views Automatic Transmission Shift Lock Actuator 1 - Lower Console 2 - Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 11071 Shift Interlock Solenoid: Diagrams Shift Lock Control Connector End Views Automatic Transmission Shift Lock Actuator Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 11072 Shift Interlock Solenoid: Service and Repair Automatic Transmission Shift Lock Actuator Replacement Important: After assembling the shift lock actuator, turn the ignition forward but do not start (auxiliary position) and attempt to pull the lever from PARK with and without the brake pedal depressed to verify there is no gear access without the brake pedal depressed. Important: Ensure the key cannot be removed from the ignition unless both the shiftier is in PARK and the shift knob button has been depressed. Removal Procedure 1. Remove the console. 2. Disconnect the shift lock actuator (3) electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 11073 3. Shift assembly to the LOW position. 4. Loosen and remove the screw at the rear of the shiftier assembly. 5. Shift the assembly to the NEUTRAL position. 6. Loosen and remove the top screw of the shift lock actuator through the lever slot. 7. Pull lever to the DRIVE position and remove the shift lock actuator. Installation Procedure 1. In DRIVE position, depress the shift lock actuator button and realign into the shiftier lever. 2. Push lever to NEUTRAL. 3. Install the top screw through the lever slot. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. 4. Shift lever to LOW. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Interlock Solenoid > Component Information > Technical Service Bulletins > Page 11074 5. Install the screw at the rear of the shiftier assembly. Tighten the actuator screw to 1.65 Nm (15 inch lbs.). 6. Connect the electrical connector (3). 7. Verify the shift lock actuator functions properly. 8. Install the console. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications Shift Solenoid Valve State and Gear Ratio Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Specifications > Page 11078 Shift Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Shift Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11081 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11082 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11083 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11084 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11085 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11086 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11087 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11088 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11089 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11090 Shift Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11091 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11092 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11093 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11094 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11095 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11096 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11097 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11098 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11099 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11100 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11101 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11102 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11103 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11104 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11105 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11106 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11107 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11108 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11109 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11110 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11111 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11112 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11113 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11114 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11115 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11116 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11117 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11118 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11119 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11120 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11121 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11122 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11123 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11124 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11125 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11126 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11127 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11128 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11129 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11130 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11131 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11132 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11133 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11134 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11135 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11136 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11137 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11138 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11139 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11140 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11141 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11142 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11143 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11144 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11145 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11146 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11147 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11148 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11149 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11150 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11151 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11152 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11153 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11154 Shift Solenoid: Connector Views Automatic Transmission Internal Connector End Views 1-2 Shift Solenoid (SS) Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11155 2-3 Shift Solenoid (SS) Valve, Wiring Harness Side 3-2 Shift Solenoid (SS) Valve Assembly, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 11156 Shift Solenoid: Service and Repair Control and Shift Solenoids Replacement Removal Procedure 1. Remove the transmission oil pan and filter. 2. Remove the 1-2 accumulator if necessary. Important: Do not remove the valve body for the following procedures. Removal of the 1-2 accumulator is necessary only if servicing the pressure control solenoid. 3. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 4. Remove the pressure control solenoid retainer. 5. Remove the pressure control solenoid. 6. Remove the 1-2 and 2-3 shift solenoid retainers. 7. Remove the 1-2 and 2-3 shift solenoids. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 11157 8. Remove the 3-2 control solenoid retainer. 9. Remove the 3-2 control solenoid. Installation Procedure 1. Install the 3-2 control solenoid. 2. Install the 3-2 control solenoid retainer. 3. Install the 1-2 and 2-3 shift solenoids. 4. Install the 1-2 and 2-3 shift solenoid retainers. 5. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Shift Solenoid, A/T > Component Information > Diagrams > Page 11158 Notice: Refer to Fastener Notice in Service Precautions. 6. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 7. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 8. Install the 1-2 accumulator. 9. Install the transmission oil pan and filter. 10. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 11. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). See: Automatic Transmission/Transaxle/Description and Operation/Transmission Adaptive Functions (TCM) Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Locations Torque Converter Clutch Solenoid: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions Torque Converter Clutch Solenoid: Diagram Information and Instructions Electrical Symbols Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11164 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11165 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11166 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11167 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11168 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11169 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11170 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11171 Utility/Van Zoning UTILITY/VAN ZONING Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11172 All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The table explains the numbering system. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11173 Torque Converter Clutch Solenoid: Diagnostic Aids Abbreviations and Meanings ABBREVIATIONS AND MEANINGS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11174 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11175 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11176 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11177 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11178 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11179 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11180 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11181 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11182 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11183 Arrows and Symbols ARROWS AND SYMBOLS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11184 This service data uses various symbols in order to describe different service operations. Basic Knowledge Required BASIC KNOWLEDGE REQUIRED Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11185 Conversion - English/Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11186 Conversion - English/Metric (Part 2) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11187 Equivalents - Decimal And Metric (Part 1) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11188 Equivalents - Decimal And Metric (Part 2) Diagnostic Work Sheets DIAGNOSTIC WORK SHEETS The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity. Fasteners FASTENERS METRIC FASTENERS This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and strength. A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive(R) or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive(R) recess head screws. GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches. FASTENER STRENGTH IDENTIFICATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11189 Fastener Strength Identification The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face. The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States, and may exhibit the following: - Lower strength - No numbered head marking system - Wrong thread pitch The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications: M6.0 X 1 - M8 X 1.25 - M10 X 1.5 - M12 X 1.75 - M14 X 2.00 - M16 X 2.00 PREVAILING TORQUE FASTENERS Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. ALL METAL PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener. NYLON INTERFACE PREVAILING TORQUE FASTENERS These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads. ADHESIVE COATED FASTENERS Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11190 These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener. A prevailing torque fastener may be reused ONLY if: The fastener and the fastener counterpart are clean and not damaged - There is no rust on the fastener - The fastener develops the specified minimum torque against its counterpart prior to the fastener seating Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11191 Metric Prevailing Torque Fastener Minimum Torque Development METRIC PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11192 English Prevailing Torque Fastener Minimum Torque Development ENGLISH PREVAILING TORQUE FASTENER MINIMUM TORQUE DEVELOPMENT Checking Aftermarket Accessories CHECKING AFTERMARKET ACCESSORIES Do not connect aftermarket accessories into the following circuits: CAUTION: Refer to SIR Caution in Service Precautions. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. NOTE: Refer to OBD II Symbol Description Notice in Service Precautions. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11193 Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems. Possible causes of vehicle problems related to aftermarket accessories include: - Power feeds connected to points other than the battery - Antenna location - Transceiver wiring located too close to vehicle electronic modules or wiring - Poor shielding or poor connectors on antenna feed line - Check for recent service bulletins detailing installation guidelines for aftermarket accessories. Inducing Intermittent Fault Conditions INDUCING INTERMITTENT FAULT CONDITIONS TOOLS REQUIRED J 25070 Heat Gun Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, engine torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including: Wiggling the harness - Disconnecting a connector and reconnecting - Stressing the mechanical connection of a connector - Pulling on the harness or wire in order to identify a separation/break inside the insulation - Relocating a harness or wires All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure . Another option is, with the component commanded ON and OFF by the scan tool, move related connectors and wiring and observe the component operation. With the engine running, move related connectors and wiring while monitoring engine operation. If harness or connector movement affects the data displayed, component/system operation, or engine operation, inspect and repair the harness/connections as necessary. You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floorjacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to Peak Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents. Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well. There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions. SALT WATER SPRAY Some compounds possess the ability to conduct electricity when dissolved in water such as ordinary salt. By mixing table salt with water in sufficient quantities, you can enhance the conductive properties of water so that any circuit which may be sensitive to moisture will more readily fail when liberally sprayed with this mixture. Mixing 0.35L (12 oz) of water with approximately 1 tablespoon of salt will yield a salt solution of 5 percent. Fill a normal spray bottle with this mixture. This mixture is sufficient to enhance the water's own conductivity. This may cause the circuit to fail more easily when sprayed. Once the mixture is completed, spray the suspect area liberally with the solution. Then, while monitoring either a scan tool or DMM, manipulate the harness as discussed previously. HIGH TEMPERATURE CONDITIONS If the complaint tends to be heat related, you can simulate the condition using the J 25070. Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition. The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however. LOW TEMPERATURE CONDITIONS Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the shade can have the desired effect. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11194 If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern. DUPLICATING FAILURE CONDITIONS - If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions. - Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set. 1. Review and record Freeze Frame/Failure Records data. 2. Clear the DTCs using the scan tool. 3. Turn the key to OFF and wait 15 seconds. 4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed. 5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed. - An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern. Measuring Frequency MEASURING FREQUENCY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the frequency of a signal. IMPORTANT: Connecting the DMM to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range. 1. Apply power to the circuit. 2. Set the rotary dial of the DMM to the V (AC) position. 3. Connect the positive lead of the DMM to the circuit to be tested. 4. Connect the negative lead of the DMM to a good ground. 5. Press the Hz button on the DMM. 6. The DMM will display the frequency measured. Measuring Voltage MEASURING VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure measures the voltage at a selected point in a circuit. 1. Disconnect the electrical harness connector for the circuit being tested, if necessary. 2. Enable the circuit and/or system being tested. Use the following methods: - Turn ON the ignition, with the engine OFF. - Turn ON the engine. - Turn ON the circuit and/or system with a scan tool in Output Controls. - Turn ON the switch for the circuit and/or system being tested. 3. Select the V (AC) or V (DC) position on the DMM. 4. Connect the positive lead of the DMM to the point of the circuit to be tested. 5. Connect the negative lead of the DMM to a good ground. 6. The DMM displays the voltage measured at that point. Measuring Voltage Drop MEASURING VOLTAGE DROP NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure determines the difference in voltage potential between 2 points. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11195 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 point of the circuit to be tested. 3. Connect the negative lead of the DMM to the other point of the circuit. 4. Operate the circuit. 5. The DMM displays the difference in voltage between the 2 points. Probing Electrical Connectors PROBING ELECTRICAL CONNECTORS IMPORTANT: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals. Frontprobe Disconnect the connector and probe the terminals from the mating side (front) of the connector. NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11196 Refer to the table as a guide in selecting the correct test adapter for frontprobing connectors: Backprobe IMPORTANT: Backprobe connector terminals only when specifically required in diagnostic procedures. - Do not backprobe a sealed (Weather Pack(r)) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector. - Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe. - After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact. Do not disconnect the connector and probe the terminals from the harness side (back) of the connector. Scan Tool Snapshot Procedure SCAN TOOL SNAPSHOT PROCEDURE TOOLS REQUIRED Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11197 J 42598 Vehicle Data Recorder Snapshot is a recording of the parameters of a control module while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition recur, rather than trying to view all the data in anticipation of the fault. The snapshot contains information around a trigger point that you have determined. There are many different scan tools that have varying functions. For example, the Tech 2 Scan Tool can also graph parameters separately or in combinations of parameters for comparison. Only a single data list may be recorded in each snapshot. It can trigger a Snapshot manually at the time the symptom is noticed, or be set up in advance to trigger when a DTC sets. The Tech 2 Scan Tool has the ability to store 2 snapshots. The ability to record 2 snapshots allows comparing hot versus cold and good versus bad vehicle scenarios. The snapshots are stored on a first-in, first-out basis. If a third snapshot is taken, the first snapshot stored in the memory will be lost. Snapshots can be 1 of 2 types: Snapshot-taken from the Snapshot menu choice - Quick Snapshot-taken from the Data Display soft key choice, does not contain DTC information When a snapshot is taken, it is recorded on the memory card and may contain as many as 1,200 frames of information. Because the snapshot is recorded onto the memory card, snapshots are not lost if the Tech 2 Scan Tool is powered down. The snapshot replay screen has a plot soft key that can be of great value for intermittent diagnosis. The snapshot plot feature can help you to quickly determine if a sensor is outside of its expected values by plotting 3 parameters at a time. The data will be displayed both graphically and numerically showing the minimum and maximum values for all frames captured. This is helpful, especially if the fault occurs only once and does not set a DTC. VEHICLE DATA RECORDER The J 42598 is connected to the data link connector (DLC) and sent with the customer. The J 42598 captures data for later retrieval and analysis by the technician. Refer to the vehicle data recorder user instructions for more information. Testing for a Short to Voltage TESTING FOR A SHORT TO VOLTAGE NOTE: Refer to Test Probe Notice in Service Precautions. The following procedure tests for a short to voltage in a circuit. 1. Set the rotary dial of the DMM to the V (DC) position. 2. Connect the positive lead of the DMM to 1 end of the circuit to be tested. 3. Connect the negative lead of the DMM to a good ground. 4. Turn ON the ignition and operate all accessories. 5. If the voltage measured is greater than 1 volt, there is a short to voltage in the circuit. Testing for Continuity TESTING FOR CONTINUITY NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures verify good continuity in a circuit. With A DMM 1. Set the rotary dial of the DMM to the ohm position. 2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit. 3. Disconnect the load. 4. Press the MIN MAX button on the DMM. 5. Connect one lead of the DMM to one end of the circuit to be tested. 6. Connect the other lead of the DMM to the other end of the circuit. 7. If the DMM displays low or no resistance and a tone is heard, the circuit has good continuity. With A Test Lamp IMPORTANT: Only use the test lamp procedure on low impedance power and ground circuits. 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested. 4. Connect the other lead of the test lamp to battery positive voltage. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11198 5. Connect the other end of the circuit to ground. 6. If the test lamp illuminates (full intensity), then the circuit has good continuity. Testing for Electrical Intermittents TESTING FOR ELECTRICAL INTERMITTENTS Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment. - Testing for Short to Ground - Testing for Continuity - Testing for a Short to Voltage If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the circuit without having to watch the J 39200 . The J 39200 will generate an audible tone when a change is detected. IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured. 1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. 2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position. 3. Press the range button of the J 39200 in order to select the desired voltage range. 4. Press the MIN MAX button of the J 39200 . The J 39200 displays 100 ms RECORD and emits an audible tone (beep). IMPORTANT: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change. 5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions . 6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded. 7. Press the MIN MAX button once in order to display the MAX value and note the value. 8. Press the MIN MAX button again in order to display the MIN value and note the value. 9. Determine the difference between the MIN and MAX values. - If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists. Repair the condition as necessary. - If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does not exist. Testing for Intermittent Conditions and Poor Connections TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS TOOLS REQUIRED - J 35616 GM-Approved Terminal Test Kit - J-38125 Terminal Repair Kit When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition. Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items: Wiring broken inside the insulation - Poor connection between the male and female terminal at a connector - Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc. - Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits. - Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle. - Wiring that comes in contact with hot or exhaust components - Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern. - Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions. - Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11199 TESTING FOR PROPER TERMINAL CONTACT It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation. Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit. Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the J 35616 when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit. ROUND WIRE CONNECTORS Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the J-38125 or the J 38125-4 Instruction Manual for terminal identification. Follow the procedure below in order to test terminal contact: 1. Separate the connector halves. 2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body. 3. Using an equivalent male terminal from the J-38125 , test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question. CONTROL MODULE/COMPONENT VOLTAGE AND GROUNDS Poor voltage or ground connections can cause widely varying symptoms. Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Power Distribution Schematics. - Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component. Refer to Circuit Testing and Ground Distribution Schematics . TEMPERATURE SENSITIVITY - An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot. - Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable. - If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures - Underhood/engine generated heat - Circuit generated heat due to a poor connection, or high electrical load - Higher than normal load conditions, towing, etc. - If the intermittent is related to cold, review the data for the following: Low ambient temperatures-In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion. - The condition only occurs on a cold start. - The condition goes away when the vehicle warms up. - Information from the customer may help to determine if the trouble follows a pattern that is temperature related. - If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition. Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required. ELECTROMAGNETIC INTERFERENCE (EMI) AND ELECTRICAL NOISE Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions: A misrouted harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator etc-These components may induce electrical noise on a circuit that could interfere with normal circuit operation. - Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch-These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating. - Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc-These accessories may lead to interference while in use, but do not fail when the accessories are not in use. Refer to Checking Aftermarket Accessories. - Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11200 - The generator may be allowing AC noise into the electrical system. INCORRECT CONTROL MODULE - There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed. - A control module from another vehicle is installed. - Revised software/calibration files have been released for this vehicle. IMPORTANT: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern. Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Testing for Short to Ground TESTING FOR SHORT TO GROUND NOTE: Refer to Test Probe Notice in Service Precautions. The following procedures test for a short to ground in a circuit. With A DMM 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Set the rotary dial of the DMM to the ohm position. 4. Connect 1 lead of the DMM to 1 end of the circuit to be tested. 5. Connect the other lead of the DMM to a good ground. 6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit. With A Test Lamp 1. Remove the power feed (i.e. fuse, control module) from the suspect circuit. 2. Disconnect the load. 3. Connect 1 lead of the test lamp to battery positive voltage. 4. Connect the other lead of the test lamp to 1 end of the circuit to be tested. 5. If the test lamp illuminates, there is a short to ground in the circuit. Fuse Powering Several Loads 1. Review the system schematic and locate the fuse that is open. 2. Open the first connector or switch leading from the fuse to each load. 3. Connect a DMM across the fuse terminals (be sure that the fuse is powered). - When the DMM displays voltage the short is in the wiring leading to the first connector or switch. - If the DMM does not display voltage 4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted. Troubleshooting with a Digital Multimeter TROUBLESHOOTING WITH A DIGITAL MULTIMETER NOTE: Refer to Test Probe Notice in Service Precautions. IMPORTANT: Circuits which include any solid state control modules, such as the PCM, should only be tested with a 10 megohm or higher impedance digital multimeter such as the J 39200. The J 39200 instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference. A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present, a DMM indicates how much voltage is present. The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity. IMPORTANT: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11201 Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement. Following are examples of the various methods of connecting the DMM to the circuit to be tested: Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors. - Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses. - If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly. Troubleshooting With A Test Lamp TROUBLESHOOTING WITH A TEST LAMP TOOLS REQUIRED J 35616-200 Test Light - Probe Kit NOTE: Refer to Test Probe Notice in Service Precautions. A test lamp can simply and quickly test a low impedance circuit for voltage. The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads. To properly operate this tool use the following procedures. When testing for voltage: 1. Attach 1 lead to ground. 2. Touch the other lead to various points along the circuit where voltage should be present. 3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground: 1. Attach 1 lead to battery positive voltage. 2. Touch the other lead to various points along the circuit where ground should be present. 3. When the bulb illuminates, there is ground at the point being tested. Using Connector Test Adapters USING CONNECTOR TEST ADAPTERS NOTE: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size. Using Fused Jumper Wires USING FUSED JUMPER WIRES TOOLS REQUIRED J 36169-A Fused Jumper Wire IMPORTANT: A fused jumper may not protect solid state components from being damaged. The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested. Bosch Connectors (BSK) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11202 BOSCH CONNECTORS (BSK) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. 2. Remove the wire dress cover, if necessary. 3. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 4. Insert the J 38125-561 tool into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 5. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Bosch Connectors (0.64) BOSCH CONNECTORS (0.64) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Locate the lever lock on the wire dress cover. While pressing the lock, pull the lever over and past the lock until the lever is at the end of its travel. 2. Disconnect the connector from the component. 3. Pull the rubber boot that covers the wires back to expose the end of the connector dress cover. 4. Place the connector locking lever in the center of the connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11203 5. Locate the 2 dress cover locking tabs that are on the wire end of the connector. Insert a small flat-bladed tool between the cover and connector body and pry up. 6. Locate the 2 dress cover locking tabs located on the opposite side of the connector. Insert a small flat-bladed tool between the cover at the connector end and pry up. 7. Remove the dress cover. 8. Cut the tie wrap on the wire bundle. 9. Remove the terminal position assurance (TPA) by inserting a small flat-bladed tool into the small slot in the end of the slider and pushing on the TPA until it comes out of the connector. When the TPA exits the opposite side of the connector, gasp the TPA and pull it completely out of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11204 connector. 10. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 11. Insert the J 38125-560 (GM P/N 15314260) into the 2 triangular cavities on each side of the terminal at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 12. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. TERMINAL REPLACEMENT PROCEDURE 1. Never insert the same terminal back into the connector once it is removed. Crimp on a new terminal. 2. Prior to installation the terminal must be aligned so the (1) coding lugs align with the (2) coding grooves on the connector. 3. Once the terminal is aligned, slide the terminal into the cavity until the retainer has engaged in the cavity of the connector. 4. Slide the TPA in the connector body and seat it using a small flat bladed tool. The TPA is seated when it is flush with the contact housing. 5. Secure the wires to the connector body using a tie wrap and replace the dress cover and grommet. Bosch Connectors (2.8 JPT) BOSCH CONNECTORS (2.8 JPT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11205 1. Pull out the slider on the connector position assurance (CPA) until it is at the end of its travel. 2. Disconnect the connector from the component. 3. Remove the wire dress cover, if necessary. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-557 (GM P/N 12122378) into the 2 cavities on each side of the terminal at the front of the connector and push until you feel the tool disengage the terminal retainers. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125. Connector Position Assurance Locks CONNECTOR POSITION ASSURANCE LOCKS The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors throughout the vehicle. CPAs are also used in all SIR system electrical connectors. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals, of the connector. Delphi Connectors (Micro .64) DELPHI CONNECTORS (MICRO .64) TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: When probing female 0.64 terminals, it is important to use the correct adapter. There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J 35616 64B which has a tin terminal and a blue wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis. REMOVAL PROCEDURE Follow the steps below in order to remove terminals from Micro 64 connectors. 1. Locate the lever lock on the wire dress cover. While depressing the lock, pull the lever over and past the lock. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11206 2. Disconnect the connector from the component. 3. Locate the dress cover locking tabs at the front of the connector. Using a small flat-blade tool push down on one of the locking tabs and pull the cover up until the dress cover releases. Repeat this procedure for the other locking tab. 4. Once the front 2 locks are unlocked, lift the front of the dress cover and pull it forward. 5. Remove the TPA by inserting a small flat-blade tool into the small slot on the TPA and pushing down until the TPA releases. Gently pry the TPA out of the connector. IMPORTANT: Always use care when removing a terminal position assurance (TPA) in order to avoid damaging it. 6. Insert the J 38125-21 (GM P/N 15381651-2) tool into the round canal between the terminals cavities at the front of the connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. IMPORTANT: Be careful not to angle or rock the J 38125-21 tool when inserting it into the connector or the tool may break. 7. While holding the removal tool in place, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. REPAIR PROCEDURE Follow the steps below in order to repair Micro 64 connector terminals. The Micro 64 connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-64 (M jaw) was developed to crimp Micro 64 terminals. The J 38125-64 crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. The J 38125-64 crimping tool is also designed to crimp both the wire and the insulation at the same time. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11207 After the terminal is removed from the connector perform the following procedure in order to repair Micro 64 terminals. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 1. Cut the wire as close to the damaged terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Depress the spring loaded locator of the crimping tool until the terminal holder is completely visible. 4. Insert terminal into the appropriate terminal holder until it hits bottom and stops. The correct terminal holder is determined by the wire size. Also ensure that the terminals wings are pointing towards the former on the tool and the release locator. 5. Insert the stripped cable into the terminal. Insulation should be visible on both sides of the terminal insulation wings. 6. Compress the handles until the ratchet automatically releases. 7. Place the terminal into the appropriate cavity and assemble the connector. Delphi Connectors (Micro-Pack 100W) DELPHI CONNECTORS (MICRO-PACK 100W) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL PROCEDURE There are 2 styles of Micro-Pack 100W connectors. These connectors are very similar but use different terminals and have some minor physical differences also. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11208 The first connector design of the Micro-Pack 100W (1) has a white connector interface that holds the terminals. The second design of the Micro-Pack 100W (2) has a gray interface to hold the terminals. Also, the first design has terminal cavities that are further apart (3 mm centerline) and offset from the other row of terminal cavities in the connector. The second design has terminals cavities that are closer together (2.54 mm centerline) and aligned vertically. One other way to identify the second design is the thin strip of material that runs along the outside of the cavities. IMPORTANT: There are 2 styles of Micro-Pack 100W terminals which are very similar. Ensure that you have the correct terminal before crimping the new terminal to the wire. The first design connector uses the longer terminal (1) that has a raised area in front of the recess in the terminal. The second design connector uses the shorter terminal without the raised area. Follow the steps below in order to remove terminals from Micro-Pack 100Wconnectors. Some Micro-Pack 100W connector disassembly procedures will vary. Use this procedure as a guide. 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11209 2. Locate the nose piece locking tabs that are positioned on the side of the connector nose piece. The connector nose piece acts as a terminal positive assurance (TPA) and may be referred to as such. 3. Use a small flat-blade tool to push in one of the locking tabs while gently pulling on the same side of the nose piece. 4. Repeat the procedure for the other locking tab and remove the nose piece. 5. Remove the wire dress cover. The following is a general procedure for wire dress cover removal. Use this procedure as a guide, some dress cover removal procedures may vary. 6. Use fingers to squeeze the 2 locking legs of the cover. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11210 7. Apply pressure and gently rock the cover until one locking leg is unseated. 8. Continue to apply pressure and rock the cover until the second locking leg is unseated. Repeat procedure for the other side of the dress cover and remove the cover. 9. Use J 38125-12A (GM P/N 12094429) to gently lift the terminal retaining tab while gently pulling the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 10. If the terminal is severely bent or damaged, it may be possible on some connectors to push the wire out of the front of the connector instead of Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11211 pulling it through. This will prevent damage to the internal seals of the connector. Once the terminal is pushed out of the connector, cut the wire as close to the terminal as possible and pull the wire through the connector. TERMINAL REPAIR PROCEDURE The Micro-Pack 100W connectors have small terminals that are difficult to handle and hold when crimping. In order to aid the technician when crimping these terminals, a new crimping tool was developed. The J 38125-101 (W jaw) crimping tool was developed to crimp Micro-Pack 100W terminals. The J 38125-101 (W jaw) crimping tool has a terminal holding block that will hold the terminal in place while the terminal is being crimped. After the terminal is removed from the connector perform the following procedure in order to repair Micro-Pack 100w terminals. 1. Cut the wire as close to the terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. IMPORTANT: After cutting the damaged terminal from the wire, determine if the remaining wire is long enough to reach the connector without putting a strain on the wire. If the wire is not long enough, splice a small length of the same gage wire to the existing wire, then crimp the new terminal on the added wire. 3. Depress the spring loaded locator of the J 38125-101 (W jaw) crimping tool until the terminal holder is completely visible. 4. Insert the terminal into the crimp tool until the core wings are flush with the anvil on the crimp tool. Be sure that the wings are pointed toward the crimp tool former and release the spring locator. The locator will hold the terminal in place. Inspect the alignment of the terminal wings with the crimp tool former. If the terminal wings are wider than the crimp tool former, remove the terminal and bend the terminal wings in slightly. 5. Place stripped wire into terminal. 6. Crimp the new terminal to the wire. If a jam occurs, press the emergency release to open applicator. TERMINAL REPLACEMENT PROCEDURE After the terminal is crimped to the wire perform the following procedure in order to replace Micro-Pack 100 terminals. 1. Slide the new terminal into the correct cavity at the back of the connector. 2. Push the terminal into the connector until it locks into place. The new terminal should be even with the other terminals. Ensure that the terminal is locked in place by gently pulling on the wire. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11212 3. To assemble the connector, reverse the Terminal Removal Procedure. Delphi Connectors (Pull To Seat) DELPHI CONNECTORS (PULL TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL If the terminal is visibly damaged or is suspected of having a faulty connection, the terminal should be replaced. Follow the steps below in order to repair pull-to-seat connectors: 1. Remove the connector position assurance (CPA) device and/or the secondary lock. 2. Disconnect the connector from the component or separate the connectors for in-line connectors. 3. Remove the terminal position assurance (TPA) device. 4. Insert the proper pick or removal tool into the front of the connector body. 5. Grasp the wire at the back of the connector body and gently push the terminal (1) out the front of the connector body (3). IMPORTANT: On connectors with more than one terminal the service loop may not be large enough to remove the terminal and crimp on a new one. If the terminal wire does not have a large enough service loop for removal, cut the wire 5 cm (2 in) behind the connector before removal. TERMINAL REPAIR 1. If the wire needed to be cut in order to remove the terminal, gently push a small length of the same size wire through the back of the connector cavity until there is enough wire exposed in order to crimp on a new terminal. If the wire was not cut, cut the existing wire as close to the old terminal as possible. 2. Strip 5 mm (3/16 in) of insulation from the wire. 3. Crimp a new terminal to the wire. 4. Solder the crimp with rosin core solder. TERMINAL INSTALLATION 1. Align the terminal and pull the wire from the back of the connector in order to seat the terminal. 2. If necessary, cut the new wire to proper length and splice with existing circuit. Refer to Splicing Copper Wire Using Splice Sleeves . 3. If the connector is outside of the passenger compartment, apply dielectric grease to the connector. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Push To Seat) DELPHI CONNECTORS (PUSH TO SEAT) TOOLS REQUIRED J-38125 Terminal Repair Kit TERMINAL REMOVAL Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11213 Follow the steps below in order to repair push to seat connectors. 1. Remove the terminal position assurance (TPA) device, the connector position assurance (CPA) device, and/or the secondary lock. 2. Separate the connector halves (1). 3. Use the proper pick or removal tool (1) in order to release the terminal. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 4. Gently pull the cable and the terminal (2) out of the back of the connector. 5. Re-form the locking device if you are going to reuse the terminal (1). 6. To repair the terminal, refer to Terminal Repair. TERMINAL REPAIR 1. Slip the cable seal away from the terminal. 2. Cut the wire as close to the terminal as possible. 3. Slip a new cable seal onto the wire. 4. Strip 5 mm (3/16 in) of insulation from the wire. 5. Crimp a new terminal to the wire. 6. Solder the crimp with rosin core solder. 7. Slide the cable seal toward the terminal. 8. Crimp the cable seal and the insulation. 9. If the connector is outside of the passenger compartment, apply grease to the connector. REINSTALLING TERMINAL 1. In order to reuse a terminal or lead assembly, refer to Wiring Repairs . 2. Ensure that the cable seal is kept on the terminal side of the splice. 3. Insert the lead from the back until it catches. 4. Install the TPA, CPA, and/or the secondary locks. Delphi Connectors (Weather Pack) DELPHI CONNECTORS (WEATHER PACK) TOOLS REQUIRED J-38125Terminal Repair Kit Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11214 The following is the proper procedure for the repair of Weather Pack(R) Connectors. 1. Separate the connector halves (1). 2. Open the secondary lock. A secondary lock aids in terminal retention and is usually molded to the connector (1). 3. Grasp the wire and push the terminal to the forward most position. Hold the wire in this position. 4. Insert the Weather Pack(r) terminal removal tool J 38125-10A (GM P/N 12014012-1) into the front (mating end) of the connector cavity until it rests on the cavity shoulder (1). 5. Gently pull on the wire to remove the terminal through the back of the connector (2). IMPORTANT: Never use force to remove a terminal from a connector. 6. Inspect the terminal and connector for damage. Repair as necessary. 7. Reform the lock tang (2) and reset terminal in connector body. 8. Close secondary locks and join connector halves. 9. Verify that circuit is complete and working satisfactorily. 10. Perform system check. Repairing Connector Terminals REPAIRING CONNECTOR TERMINALS TOOLS REQUIRED J-38125 Terminal Repair Kit Use the following repair procedures in order to repair the following: Push to Seat terminals - Pull to Seat terminals Some terminals do not require all of the steps shown. Skip the steps that do not apply for your terminal repair. The J-38125 contains further information. 1. Cut off the terminal between the core and the insulation crimp. Minimize any wire loss.For cable seal terminals, remove the seal. 2. Apply the correct cable seal per gage size of the wire, if used.Slide the seal back along the wire in order to enable insulation removal. 3. Remove the insulation. 4. For sealed terminals only, align the seal with the end of the cable insulation. 5. Position the strip in the terminal.For sealed terminals, position the strip and seal in the terminal. 6. Hand crimp the core wings. 7. Hand crimp the insulation wings.For sealed terminals, hand crimp the insulation wings around the seal and the cable. 8. Solder all of the hand crimp terminals excepting Micro-Pack 100 .64 size. Soldering Micro-Pack 100 World terminals may damage the terminal. Terminal Position Assurance Locks Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11215 TERMINAL POSITION ASSURANCE LOCKS The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Tyco/Amp Connectors (CM 42-Way) TYCO/AMP CONNECTORS (CM 42-WAY) TOOLS REQUIRED J-38125 Terminal Repair Kit REMOVAL PROCEDURE 1. Locate the connector position assurance (CPA) on the connector body and pull the CPA out. The CPA is on the wire harness side of connector. 2. Disconnect the connector from the component. 3. Use a small flat-bladed tool to gently pry off the dress cover by inserting the tool under the cover opposite the harness side and prying up. 4. Remove the cover. 5. Using a small flat-bladed tool, push on the side of the nose piece retainer while pushing the nose piece forward with your thumb. This will release the terminal position assurance (TPA). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11216 6. Insert the J 38125-12A (GM P/N 12094429) into the corresponding terminal release cavity. The release cavities are the 2 center rows of cavities on one half of the connector. 7. Pressing the J 38125-12A (GM P/N 12094429) tool in the release cavity of the terminal you are removing, gently pull the wire out of the back of the connector. Always remember never use force when pulling a terminal out of a connector. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. TERMINAL REPAIR PROCEDURE Use the appropriate terminal and crimper in the J-38125 in order to replace the terminal. Yakazi Connectors YAZAKI CONNECTORS TOOLS REQUIRED J-38125Terminal Repair Kit TERMINAL REMOVAL PROCEDURE 1. Disconnect the connector from the component. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11217 2. Insert a small flat blade tool in the slot below the front loaded terminal position assurance (TPA) and pry up. 3. Remove the TPA by pulling it out of the connector. 4. Push the wire side of the terminal that is being removed toward the connector and hold it in position. 5. Insert the J 38125-553 (GM P/N 15315247) on a slight upward angle into the cavity below the terminal to be removed. Ensure that the pointed on the end of the tool is facing the bottom of the terminal and it stays in contact with the terminal until it stops on the plastic terminal retainer. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. 6. Gently pry the plastic terminal retainer down and carefully pull the terminal out of the connector. Always remember never use force when pulling a terminal out of a connector. If the terminal is difficult to remove, repeat the entire procedure. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11218 TERMINAL REPAIR PROCEDURE Use the appropriate terminal and follow the instructions in the J-38125 Circuit Protection - Circuit Breakers CIRCUIT PROTECTION - CIRCUIT BREAKERS A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used. Circuit Breaker This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed. Positive Temperature Coefficient (PTC) Circuit Breaker This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2. Circuit Protection - Fuses CIRCUIT PROTECTION - FUSES The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (2). If not broken (1), also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current rating. Circuit Protection - Fusible Links Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11219 CIRCUIT PROTECTION - FUSIBLE LINKS Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gage size. Repairing a Fusible Link IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection. Refer to Splicing Copper Wire Using Splice Clips. Flat Wire Repairs FLAT WIRE REPAIRS NOTE: The flat wire within the flex wiring harness is not serviceable. If an open or short exists within the flex wiring harness the complete harness must be replaced. GMLAN Wiring Repairs GMLAN WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working on GMLAN connectors and terminals. The tool kit J-38125 contains the following items in order to repair the GMLAN wiring: DuraSeal splice sleeves - A wire stripping tool - J 38125-8 Crimping Tool (GM P/N 12085115) - J 38125-5 Ultra Torch Special Tool (GM P/N 12085116) The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors GMLAN REPAIRS IMPORTANT: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the network is a twisted pair, the twist must be maintained after the repair is completed. GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2 wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation. GMLAN CONNECTOR TERMINAL REPAIR IMPORTANT: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair. The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy circuits. These terminals are available in the J-38125. If the individual terminals are damaged on any GMLAN connection, use the appropriate connector repair procedure in order to repair the terminal. Refer to Connector Repairs for the appropriate connector repair procedure. GMLAN WIRE REPAIR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11220 IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice. 1. Open the harness by removing any tape: - Use a sewing seam ripper (available from sewing supply stores) in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except coaxial. - Do not use the DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent American wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 5. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11221 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Start in the middle and gradually move the heat barrel to the open ends of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Heated Oxygen Sensor Wiring Repairs HEATED OXYGEN SENSOR (HO2S) WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit NOTE: Do not solder repairs under any circumstances as this could result in the air reference being obstructed. If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. - Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire. - Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11222 the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance. - To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector. The engine harness may be repaired using the J-38125. High Temperature Wiring Repairs HIGH TEMPERATURE WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit HIGH TEMPERATURE WIRING Wiring that is exposed to high temperatures, 135°C (275°F) or higher, for prolonged periods of time may use materials i.e. wires, connectors, and shielding that has a higher heat rating than typical wiring. When making a repair in a high temperature area observe the following: Use high temperature bulk wire rated at 150°C (302°F) continuous temperature to replace any damaged wire. - Replace any heat shielding that is removed. - Cover any DuraSeal splice sleeves with SCT1 shrink tubing (available in the J-38125 Terminal Repair kit). - After making a wiring repair, ensure that the location of the wiring is not moved closer to the heat source. IDENTIFYING HIGH TEMPERATURE WIRING Wiring that is exposed to high temperature, 135°C (275°F) or higher, for prolonged periods of time need special considerations when making wiring repairs. Areas that may be exposed to higher temperatures can be identified by heat resistant materials that are being used in those areas. These materials may include heat reflective tape, moon tape, and high temperature shrink tubing. Also conduit and other protective coverings may be used. Because conduit or similar coverings are used throughout the vehicle regardless of the temperature, it may be necessary for the technician to determine if an area is exposed to excessive heat before making a wiring repair. Obvious areas of consideration would be any area located near the exhaust manifolds, catalytic converter, and exhaust pipes. The J-38125 contains much of the material you will need to perform repairs on areas exposed to high heat. The kit contains the following items: DuraSeal splice sleeves to crimp and seal connections - High temperature SCT1 shrink tubing to protect the splice sleeves - A large sampling of common electrical terminals - The correct crimp tool to attach the terminals to the wires - The correct tools to remove the terminals from the connectors The J-38125 does not contain wire that is suitable to high temperature exposure. Use high temperature bulk wire rated at 150°C (302°F) continuous temperature of the same or larger gage size as the original wire when repair damage wire. Also replace any reflective tape that you remove during the repair. HIGH TEMPERATURE WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire rated at 150°C (302°F) continuous temperature rating of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 and then encapsulate the splice sleeve using the high temperature SCT1 shrink tubing. Use the following wiring repair procedures in order to ensure the integrity of the Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11223 sealed splice. 1. Open the harness by removing any tape. IMPORTANT: You must perform the following procedures in the order listed. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip keeping all of the wire strands intact. 2. Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. 3. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 4. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent american wire gage (AWG) size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 5. Slide a section of high temperature SCT1 shrink tubing down the length of wire to be spliced. Ensure that the shrink tubing will not interfere with the splice procedure. 6. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. 7. Use the Splice Crimp Tool from the J-38125 in order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 8. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 9. Insert the wire into the DuraSeal splice sleeve barrel until the wire hits the barrel stop. 10. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11224 11. Using the heat torch, apply heat to the crimped area of the barrel. 12. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 13. Center the high temperature SCT1 shrink tube over the DuraSeal splice sleeve. 14. Using the heat torch, apply heat to the high temperature heat shrink tubing. 15. Gradually move the heat from the center to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. 16. Replace any reflective tape and clips that may have been remove during the repair. Repairing Damaged Wire Insulation REPAIRING DAMAGED WIRE INSULATION Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11225 If the conductive portion of the wire is not damaged, locate the problem and apply tape around the wire. If the damage is more extensive, replace the faulty segment of the wire. Refer to Splicing Copper Wire Using Splice Clips and follow the instruction to repair the wire. SIR/SRS Wiring Repairs SIR/SRS WIRING REPAIRS TOOLS REQUIRED J-38125 Terminal Repair Kit The Supplemental Inflatable Restraint (SIR) System/Supplemental Restraint System (SRS) requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR/SRS, and the wiring components, such as connectors and terminals. IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR/SRS system terminals. Use either an SIR/SRS pigtail or a terminated lead from the SIR Repair Kit Tray. The tool kit J-38125 contains the following items: DuraSeal splice sleeves, in order to repair the SIR/SRS wiring - A wire stripping tool - A special crimping tool - A heat torch - An instruction manual The DuraSeal splice sleeves have the following 2 critical features: A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside. - A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits. The J-38125 also serves as a generic terminal repair kit. The kit contains the following items: A large sampling of common electrical terminals - The correct tools in order to attach the terminals to the wires - The correct tools in order to remove the terminals from the connectors SIR/SRS CONNECTOR REPAIR (PLASTIC BODY AND TERMINAL METAL PIN) The terminals in the SIR/SRS system are made with a special plating. This plating provides the necessary contact integrity for the sensitive, low energy circuits. Use the J-38125 SIR/SRS Terminal Repair Kit for repairing SIR/SRS terminals and connectors. Do not substitute any other terminals for those in the repair kit. The J-38125 SIR/SRS Terminal Repair Kit contains: Various terminated leads for sensing and diagnostic module (SDM) terminal replacement - Various connector positive assurance (CPA) locks for SIR/SRS connectors - Base of steering column pigtail connectors part number 12085514 - Yellow vinyl electrical tape Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11226 Pigtail repair packs are available for SIR/SRS connectors with eight or less terminals. Only the connector body is available for connectors with more than eight terminals. The terminated leads in the J-38125 SIR/SRS Terminal Repair Kit can be used to replace damaged terminals when replacing the connector body. SIR/SRS COMPONENT WIRE PIGTAIL REPAIR IMPORTANT: Do not make wire, connector, or terminal repairs on components with wire pigtails. A wire pigtail is a wire or wires attached directly to the device, not by a connector. If a wiring pigtail is damaged, you must replace the entire component, with pigtail. The inflatable restraint steering wheel module coil is an example of a pigtail component. SIR/SRS WIRE REPAIR IMPORTANT: Refer to Wiring Repairs in order to determine the correct wire size for the circuit you are repairing. You must obtain this information in order to ensure circuit integrity. If any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm etc). Use the DuraSeal splice sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves. 1. Open the harness by removing any tape: - Use a sewing seam ripper, available from sewing supply stores, in order to cut open the harness in order to avoid wire insulation damage. - Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial. - Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together. IMPORTANT: You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact. 2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors. 3. Strip the insulation: - When adding a length of wire to the existing harness, use the same size wire as the original wire. - Perform one of the following items in order to find the correct wire size: Find the wire on the schematic and convert the metric size to the equivalent AWG size. - Use an AWG wire gage. - If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation. - Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced. - Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands. - If the wire is damaged, repeat this procedure after removing the damaged section. 4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11227 5. Use the Splice Crimp Tool from the J-38125 to crimp DuraSeal splice sleeve. In order to position the DuraSeal splice sleeve in the proper color nest of the Splice Crimp Tool. The crimp tool has three nests, 1 is for the salmon and green splice sleeve, 2 is for the blue splice sleeve, and 3 is for the yellow splice sleeve. 6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest. 7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop. 8. Tightly close the handles of the crimp tool until the crimper handles open when released.The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice. 9. Using the heat torch, apply heat to the crimped area of the barrel. 10. Gradually move the heat barrel to the open end of the tubing: - The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. CONNECTOR POSITION ASSURANCE (CPA) The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of a connector. CPAs are used in all SIR System connectors and also in some connectors of other systems. The CPA ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the mating terminals of a connection. TERMINAL POSITION ASSURANCE (TPA) The terminal position assurance (TPA) insert resembles the plastic combs used in the control module connectors. The TPA keeps the terminal securely seated in the connector body. Do not remove the TPA from the connector body unless you remove a terminal for replacement. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11228 Splicing Copper Wire Using Splice Clips SPLICING COPPER WIRE USING SPLICE CLIPS IMPORTANT: When making a splice in an area that may be exposed to moisture use a crimp and seal splice sleeve instead of a Splice Clip. Refer to Splicing Copper Wire Using Splice Sleeves Tools required J-38125 Terminal Repair Kit 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original (except fusible link). - The wire's insulation must have the same or higher temperature rating. Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced. 5. Select the proper clip to secure the splice. Follow the instructions in the J-38125 in order to determine the proper clip size crimp tool and anvil. 6. Overlap the 2 stripped wire ends and hold them between thumb and forefinger. 7. Center the splice clip (2) over the stripped wires (1) and hold the clip in place. - Ensure that the wires extend beyond the clip in each direction. - Ensure that no insulation is caught under the clip. 8. Center the crimp tool over the splice clip and wires. 9. Apply steady pressure until the crimp tool closes.Ensure that no strands of wire are cut. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11229 10. Crimp the splice on each end (2). 11. Apply 60/40 rosin core solder to the opening in the back of the clip. Follow the manufacturer's instructions for the solder equipment. 12. Tape the splice. Roll on enough tape in order to duplicate the thickness of the insulation on the existing wires. 13. Additional tape can be applied to the wire if the wire does not belong in a conduit or another harness covering. Use a winding motion in order to cover the first piece of tape. Splicing Copper Wire Using Splice Sleeves SPLICING COPPER WIRE USING SPLICE SLEEVES TOOLS REQUIRED J-38125 Terminal Repair Kit IMPORTANT: Use only duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11230 Use duraseal splice sleeves to form a one-to-one splice on all types of insulation except tefzel and coaxial. Use duraseal splice sleeves where there is special requirements such as moisture sealing. Follow the instructions below in order to splice copper wire using duraseal splice sleeves. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the desired wire. 2. Cut the wire. - Cut as little wire off the harness as possible. - Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches, and connectors. This helps prevent moisture from bridging adjacent splices and causing damage. 3. Select the proper size and type of wire. - The wire must be of equal or greater size than the original. - The wires insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. - Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected. IMPORTANT: Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC. - Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact. 4. Strip the insulation. - Select the correct size opening in the wire stripper or work down from the largest size. - Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1). 5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table. 6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice. 7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest. 8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3). 9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve. 10. Shrink the insulation around the splice. - Using the heat torch, apply heat to the crimped area of the barrel. - Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. - A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved. Splicing Inline Harness Diodes Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11231 SPLICING INLINE HARNESS DIODES Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the following procedure. 1. Open the harness. - If the harness is taped, remove the tape. - To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness. - If the harness has a black plastic conduit, pull out the diode. 2. If the diode is taped to the harness, remove all of the tape. 3. Check and record the current flow direction and orientation of diode. 4. Remove the inoperative diode from the harness with a suitable soldering tool. IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering tool. 5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the new diode. 6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service manual wiring schematic to obtain the correct diode installation position. 7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment. 8. Reinstall terminal(s) into the connector body if previously removed. 9. Tape the diode to the harness or connector using electrical tape. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape. Splicing Twisted or Shielded Cable SPLICING TWISTED OR SHIELDED CABLE Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in order to repair the twisted/shielded cable. 1. Remove the outer jacket (1). Use care not to cut into the drain wire of the mylar tape. 2. Unwrap the tape. Do not remove the tape. Use the tape in order to rewrap the twisted conductors after the splice is made. 3. Prepare the splice. Untwist the conductors and follow the splicing instructions for copper wire. Staggering the splices by 65 mm (2.5 in) is recommended. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11232 4. Re-assemble the cable. - Rewrap the conductors with the mylar tape. - Use caution not to wrap the drain wire in the tape (1). - Follow the splicing instructions for copper wire and splice the drain wire. - Wrap the drain wire around the conductors and tape with mylar tape. IMPORTANT: Apply the mylar tape with the aluminum side inward. This ensures good electrical contact with the drain wire. 5. Tape over the entire cable. Use a winding motion when you apply the tape. Registered and Non - Registered Trademarks REGISTERED AND NON-REGISTERED TRADEMARK Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11233 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11234 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11235 Listed are Registered Trademarks ((R)) or Non-Registered Trademarks (TM) which may appear in this service data. Special Tools Ordering Information SPECIAL TOOLS ORDERING INFORMATION The special service tools shown that have product numbers beginning with J, SA or BT are available for worldwide distribution from: OE Tool and Equipment Group Kent-Moore 28635 Mound Road Warren, MI, U.S.A 48092-3499 Phone: 1-800-345-2233 or 586-574-2332 Monday through Friday 8:00 am-7:00 pm Eastern Standard Time Fax: 1-800-578-7375 or 586-578-7321 The TECH 2 scan tool and accessories can be purchased through: Dealer Equipment and Services 5775 Enterprise Dr. Warren, MI, U.S.A 48092-3463 Phone: 1-800-GM-TOOLS or 586-574-2332 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11236 Monday through Friday 8:00 am-6:00 pm EST Fax: 1-586-578-7205 Training TRAINING DEALERS All U.S. Dealers participating in the GM Common Training Program can enroll through the GM Common Training System Website at https://www.gmcommontraining.com. Within the website, there are individual training paths that are designed to assist in planning the training needs for each individual. Technicians should advise their Service Manager of their training needs including course names and course numbers. Dealers who have questions about GM Common Training should contact the GM Common Training help desk at 1-888-748-2686. The help desk is available Monday through Friday, 8:00 am-8:00pm Eastern Standard Time, excluding holidays. For GM Access support, contact the GM Access Help Desk at 1-888-337-1010. FLEETS GM Fleet customers with GM Warranty In-Shop agreements are able to participate in service technical training through GM Common Training/GM Service Technical College (STC). Assistance for all GM fleet customers using GM STC products and services is provided on the Internet via www.gmcommontraining.com using the "Contact Us" button on the site and/or the GM Common Training Help Desk at 1-888-748-2687. To order GM STC Training Materials, please contact the GM Training Materials Headquarters at 1-800-393-4831. Most GM STC course materials have associated charges. To purchase authentic GM STC Training Materials, contact the GM Training Materials Headquarters at 1-800-393-4831. NON-GM DEALER TECHNICIANS Technicians training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry. ACDelco courses are available at all approved GM Training Centers. Availability and schedules can be obtained by calling 1-800-825-5886 or contact us via the web at www.acdelcotechconnect.com and select the training button. Clinics are also offered through ACDelco Warehouse Distributors. Contract your dealer directly for more information. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11237 Torque Converter Clutch Solenoid: Connector Views Automatic Transmission Inline 20-Way Connector End View Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Diagram Information and Instructions > Page 11238 Torque Converter Clutch (TCC) Solenoid Valve, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 11239 Torque Converter Clutch Solenoid: Service and Repair Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness Tools Required ^ J28458 Seal Protector Retainer Installer Removal Procedure 1. Raise and support the vehicle. 2. Remove the transmission oil pan and the filter. 3. Disconnect the transmission harness 20-way connector from the transmission internal harness pass-through connector. Depress both tabs on the connector and pull straight up; do not pry the connector. 4. Remove the 1-2 accumulator assembly. Do not remove the spacer plate. Important: Removal of the valve body is not necessary for the following procedure. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 11240 6. Remove the TCC PWM solenoid retainer. 7. Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts. 8. Remove the pressure control solenoid retainer. 9. Remove the pressure control solenoid. 10. Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness. 11. Using J28458, release the pass-through electrical connector from the transmission case. 1. Use the small end of the J28458 over the top of the connector. 2. Twist in order to release the four tabs retaining the connector. 3. Pull the harness connector down through the transmission case. 12. Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 11241 13. Inspect the TCC solenoid and wiring harness assembly for the following defects: ^ Damage ^ Cracked connectors ^ Exposed wires ^ Loose pins Installation Procedure 1. Install the wiring harness and TCC solenoid assembly with a new O-ring seal to the transmission. 2. Install the pass-through electrical connector to the transmission case. 3. Install the valve body bolts which retain the internal wiring harness and install the TCC solenoid retaining bolts. ^ Tighten the control valve body retaining bolts to 11 Nm (97 inch lbs.). ^ Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 11242 4. Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard. 5. Install the pressure control solenoid retainer and retaining bolt. Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.). 6. Install the TCC PWM solenoid to the control valve body. 7. Install the TCC PWM solenoid retainer. 8. Connect the internal wiring harness electrical connectors to the following components: ^ Transmission fluid pressure switch (1) ^ 1-2 shift control solenoid (2) ^ 2-3 shift control solenoid (3) ^ Pressure control solenoid (4) ^ TCC PWM solenoid (5) ^ 3-2 control solenoid (6) 9. Install the 1-2 accumulator. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Actuators and Solenoids Transmission and Drivetrain > Actuators and Solenoids - A/T > Torque Converter Clutch Solenoid, A/T > Component Information > Diagrams > Page 11243 10. Connect the transmission harness 20-way connector to the transmission pass-through connector. Align the arrows on each half of the connector and insert straight down. 11. Install the transmission oil pan and filter. 12. Lower the vehicle. 13. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 14. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Lamps and Indicators Transmission and Drivetrain > Lamps and Indicators - A/T > Shift Indicator > Component Information > Description and Operation Shift Indicator: Description and Operation PRND321 DISPLAY The instrument panel cluster (IPC) displays the selected gear position as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the gear position. The PRND321 display blanks if: - The PCM detects a malfunction in the transmission range switch circuit. - The IPC detects a loss of class 2 communications with the PCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Engine, A/T Controls - Shared Diagnostic Trouble Codes Control Module: Technical Service Bulletins Engine, A/T Controls - Shared Diagnostic Trouble Codes Bulletin No.: 05-06-04-060 Date: September 23, 2005 INFORMATION Subject: Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (TCM) Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P1621 Shared In Multiple Modules Models: 2005-2006 GM Passenger Cars and Light Duty Trucks (including Saturn) 2005-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Beginning in 2005, some control modules (ECM's, TCM's) have specific codes that describe internal failures of the module. These DTCs are not module specific and can be found on any controller that has these codes. Society of Automotive Engineers (SAE) J2012 committee has set these specific codes to be an industry standard of all manufacturers. Currently, these common codes are: ^ P0601 - Control Module Read Only Memory (ROM) ^ P0601 - Transmission Control Module (TCM) Read Only Memory (ROM) ^ P0602 - Control Module Not Programmed ^ P0602 - Transmission Control Module (TCM) Not Programmed ^ P0603 - Control Module Long Term Memory Reset ^ P0603 - Transmission Control Module (TCM) Long Term Memory Reset ^ P0604 - Control Module Random Access Memory (RAM) ^ P0604 - Transmission Control Module (TCM) Random Access Memory (RAM) ^ P1621 - Control Module Long Term Memory Performance ^ P1621 - Transmission Control Module (TCM) Long Term Memory Performance Important: ^ Use caution when diagnosing these shared codes to perform the appropriate diagnostic procedure on the appropriate module. ^ A low voltage condition may set one or more of the above codes. Repair any low voltage conditions prior to diagnosing the above codes. Refer to the appropriate Service Information (SI) document for Diagnosis and Repair procedures. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11255 Control Module: Locations Automatic Transmission Electronic Component Views Transmission Control Module (TCM) 1 - Engine Harness 2 - Transmission Control Module (TCM) 3 - Transmission Control Module (TCM) Connector Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11256 Control Module: Diagrams Automatic Transmission Related Connector End Views Transmission Control Module (TCM), Engine Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11257 Transmission Control Module (TCM), Engine Side (5.3L and 6.0L) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11258 Control Module: Service and Repair Transmission Control Module (TCM) Replacement Service of the transmission control module (TCM) should consist of reprogramming of the TCM. If the diagnostic procedures call for the TCM to be replaced, the replacement TCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty TCM and install the new service TCM. The replacement TCM must be programmed. Removal Procedure 1. Disconnect the negative battery cable. 2. Disconnect the cooling fan electrical connector for additional clearance while removing the TCM. 3. Depress the engine control module (ECM)/TCM cover retainers (2). 4. Remove the ECM/TCM cover from the ECM/TCM bracket (1). 5. Disconnect the TCM electrical connector (1) from the TCM (2) Notice: Refer to Handling ESD Sensitive Parts Notice. Important: It is not necessary to disconnect the TCM electrical connectors in order to remove the TCM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors. Important: Remove any debris from around the TCM connector surfaces before servicing the TCM. Inspect the TCM module connector gaskets when diagnosing or replacing the TCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the TCM. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11259 6. Release the bracket TCM retainer (1). 7. Tilt the TCM (2) away from the ECM/TCM bracket. 8. Remove the TCM (1) from the TCM bracket (2). 9. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the ECM (3). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11260 10. Remove the ECM/TCM bracket retaining bolts (2). 11. Remove the ECM/TCM bracket (1) from the vehicle frame. Installation Procedure 1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame. 2. Install the ECM/TCM bracket retaining bolts (2). 3. Tighten the ECM/TCM bracket bolts. Tighten the bolts to 10 Nm (89 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11261 4. If the ECM was previously removed from the ECM/TCM bracket (2), install the ECM (3). 5. Insert the TCM (1) into the retaining slot of the ECM/TCM bracket (2). 6. Secure the TCM (2) to the ECM/TCM mounting bracket ensuring the TCM retaining tab (1) is fully engaged. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Relays and Modules Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Technical Service Bulletins > Page 11262 7. Connect the ECM electrical connector (1) to the TCM (2) if previously removed. 8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1). 9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1). 10. Connect the cooling fan electrical connector. 11. Connect the negative battery cable. 12. If the TCM was replaced the replacement TCM must be programmed. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications TFP Manual Valve Position Switch Logic Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11268 Fluid Pressure Sensor/Switch: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11269 Fluid Pressure Sensor/Switch: Diagrams Automatic Transmission Inline 20-Way Connector End View Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11270 Fluid Pressure Sensor/Switch: Service and Repair Valve Body and Pressure Switch Replacement Removal Procedure 1. Ensure that removal of the valve body is necessary before proceeding. ^ Important: The following components can be serviced without removing the valve body from the transmission: The torque converter clutch solenoid (1) ^ The pressure control solenoid (2) ^ The internal wiring harness (3) ^ The 2-3 shift solenoid (4) ^ The 1-2 shift solenoid (5) ^ The transmission fluid pressure manual valve position switch (6) ^ The 3-2 shift solenoid (7) ^ The torque converter clutch pulse width modulation (TCC PWM) solenoid (8) 2. Remove the fluid level indicator. 3. Raise the vehicle. 4. Remove the oil pan, gasket, and filter. 5. Disconnect the internal wiring harness electrical connectors from the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11271 6. Remove the fluid indicator stop bracket bolt (2). 7. Remove the fluid indicator bracket (1). 8. Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible. 9. Remove the TCC PWM solenoid (1) in order to access the TCC solenoid retaining bolts. 10. Remove the TCC solenoid retaining bolts. 11. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body. 12. Reposition the harness to the side of the transmission case. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11272 13. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. 14. Remove the transmission fluid pressure switch. 15. Inspect the transmission fluid pressure switch for damage or debris. 16. Remove the manual detent spring retaining bolt. 17. Remove the manual detent spring. 18. Inspect the manual detent spring for cracks or damage. 19. Remove the remaining control valve body bolts. Important: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11273 20. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. Installation Procedure Ball Check Valves 1. Install the checkballs (1-7) in the valve body. 2. Install the control valve body to the transmission case while simultaneously connecting the manual valve link to the manual valve. 3. Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2). 4. Install one bolt (M6 X 1.0 X 47.5) hand tight in the center (1) of the valve body to hold it in place. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11274 5. Do not install the transmission fluid indicator stop bracket and bolt at this time. Install but do not tighten the control valve body bolts which retain only the valve body directly. Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following: ^ M6 X 1.0 X 65.0 (1) ^ M6 X 1.0 X 54.4 (2) ^ M6 X 1.0 X 47.5 (3) ^ M6 X 1.0 X 35.0 (4) ^ M8 X 1.0 X 20.0 (5) ^ M6 X 1.0 X 12.0 (6) ^ M6 X 1.0 X 18.0 (7) Important: When installing bolts throughout this procedure, be sure to use the correct bolt size and length in the correct location as specified. 6. Install the manual detent spring. 7. Install but do not tighten the manual detent spring retaining bolt. 8. Install the transmission fluid pressure switch. 9. Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11275 10. Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows. Tighten the control valve body bolts (in sequence) to 11 Nm (97 inch lbs.). Notice: Refer to Fastener Notice in Service Precautions. Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation. 11. Ensure that the manual detent spring is aligned properly with the detent lever. Tighten the manual detent spring bolt to 31 Nm (23 ft. lbs.). 12. Install the TCC solenoid with a new O-ring seal to the valve body. 13. Install the TCC solenoid bolts. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11276 Tighten the TCC solenoid retaining bolts to 11 Nm (97 inch lbs.). 14. Install the internal wiring harness to the valve body. The internal wiring harness has a tab (1) on the edge of the conduit. 15. Place the tab between the valve body and the pressure switch in the location shown (2). Press the harness into position on the valve body bolt bosses (1, 3). 16. Install the TCC PWM solenoid (1) to the control valve body. 17. Install the TCC PWM solenoid retainer (2). 18. Install the transmission fluid indicator stop bracket (1) and bolt (2). Tighten the transmission fluid indicator stop bracket bolt to 11 Nm (97 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Fluid Pressure Sensor/Switch, A/T > Component Information > Specifications > Page 11277 19. Connect the internal wiring harness electrical connectors to the following components: ^ The transmission fluid pressure manual valve position switch (1) ^ The 1-2 shift solenoid (2) ^ The 2-3 shift solenoid (3) ^ The pressure control solenoid (4) ^ The TCC PWM solenoid (5) ^ The 3-2 shift solenoid (6) 20. Install the transmission oil pan and filter. 21. Lower the vehicle. 22. Fill the transmission to the proper level with DEXRON(r) VI transmission fluid. 23. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM). Important: It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations Transmission Position Switch/Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11281 Transmission Position Switch/Sensor: Diagrams Automatic Transmission Related Connector End Views Transmission Range Switch, Wiring Harness Side Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11282 Transmission Position Switch/Sensor: Adjustments Park/Neutral Position Switch Adjustment Important: ^ The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure. ^ Apply the parking brake. ^ The engine must start in the P (Park) or N (Neutral) positions only. ^ Check the switch for proper operation. If adjustment is required, proceed as follows: 1. Place the transmission range selector in the N (Neutral) position. 2. With an assistant in the drivers seat, raise the vehicle. 3. Loosen the park/neutral position switch mounting bolts. 4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine. 5. Following a successful start, turn the engine off. 6. Tighten the bolts securing the switch to the transmission. Tighten the bolts to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 7. Lower the vehicle. 8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. 9. Replace the park/neutral position switch if proper operation can not be achieved. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11283 Transmission Position Switch/Sensor: Service and Repair Park/Neutral Position Switch Replacement Tools Required ^ J41364-A Park/Neutral Switch Aligner Removal Procedure 1. Apply the parking brake. 2. Shift the transmission into neutral. 3. Raise the vehicle. 4. Remove the nut securing the transmission control lever to the manual shaft. 5. Remove the transmission control lever from the manual shaft. 6. Disconnect the electrical connectors from the switch. 7. Remove the bolts securing the park/neutral position switch to the transmission. 8. Remove the park/neutral position switch from the manual shaft. If the park/neutral position switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs. Installation Procedure 1. Install the switch to the transmission manual shaft by aligning the switch hub flats with the manual shaft flats. 2. Slide the switch onto the transmission manual shaft until the switch mounting bracket contacts the mounting bosses on the transmission. 3. Install the switch to the transmission with two bolts finger tight. Important: If a new switch is being installed, the switch will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in it proper position for installation and the use of neutral position adjustment tool will not be necessary. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Locations > Page 11284 4. Position the tool J41364-A onto the park/neutral position switch. Ensure that the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool. 5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts securing the switch to 25 Nm (18 ft. lbs.). Notice: Refer to Fastener Notice in Service Precautions. 6. Remove the J41364-A from the switch. If installing a new switch, remove the positive assurance bracket at this time. 7. Connect the electrical connectors to the switch. 8. Install the transmission control lever to the manual shaft with the nut. Tighten the control lever nut to 25 Nm (18 ft. lbs.). 9. Lower the vehicle. 10. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only. If proper operation of the switch can not be obtained, replace the switch. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations Transmission Speed Sensor: Locations Automatic Transmission Electronic Component Views Electronic Components 36 - Vehicle Speed Sensor (VSS) - Model Dependent 66 - Torque Converter Clutch (TCC) Solenoid Valve 69 - Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch 108 - Secondary Fluid Pump Assembly - M33 Model Only 250 - Input Speed Sensor (ISS) Assembly - Model Dependent 367a - 1-2 Shift Solenoid (SS) Valve 367b - 2-3 Shift Solenoid (SS) Valve 377 - Pressure Control (PC) Solenoid Valve 394 - 3-2 Shift Solenoid (SS) Valve Assembly 396 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 11288 Vehicle Speed Sensor (VSS) 1 - VSS Sensor 2 - Transfer Case Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Speed Sensor, A/T > Component Information > Locations > Page 11289 Transmission Speed Sensor: Diagrams Automatic Transmission Inline 20-Way Connector End View Input Speed Sensor (ISS) Harness Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Temperature Sensor/Switch, A/T > Component Information > Specifications Transmission Fluid Temperature (TFT) Sensor Specifications Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set Electronic Brake Control Module: Customer Interest Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set TECHNICAL Bulletin No.: 04-05-25-002E Date: March 11, 2009 Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) Models Supercede: This bulletin is being revised to add step 2 to the procedure and update the Parts and Warranty Information. Please discard Corporate Bulletin Number 04-05-25-002D (Section 05 - Brakes). Condition Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module. Cause A poor connection at the EBCM ground is causing unnecessary replacement of brake modules. Important: The EBCM ground is different for each application. Refer to the list below for the proper ground reference: ^ Midsize Utilities = Ground 304 ^ SSR = Ground 400 ^ Fullsize Trucks and Utilities = Ground 110 Correction Important: Do not replace the brake module to correct this condition. Perform the following repair before further diagnosis of the EBCM. Perform the following steps to improve the connection of the EBCM Ground: 1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire. 2. If the original fastener has a welded on nut, remove the nut from the frame, and if required, enlarge the bolt hole to accommodate the new bolt and nut. 3. Clean the area, front and back, using a tool such as a *3M(TM) Scotch-Brite Roloc disc or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set > Page 11303 4. Install the ground, then the washer and then the bolt to the frame. Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish. 5. Install a washer and nut to the back side of the frame. Tighten Tighten the nut to 9 Nm (79 lb in). 6. Cover the front and back side of the repair area using Rubberized Undercoating. An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 Electronic Brake Control Module: Customer Interest ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 TECHNICAL Bulletin No.: 08-05-25-005 Date: October 01, 2008 Subject: Intermittent StabiliTrak(R) Indicator Light Blinking, StabiliTrak(R) Active Message Displayed, DTC C0196 Set (Reprogram Electronic Brake Control Module (EBCM)) Models: 2006-2007 Buick Rainier 2006-2009 Chevrolet TrailBlazer Models 2006-2009 GMC Envoy Models 2006-2009 Saab 97X 2006-2009 Isuzu Ascender Models This bulletin provides information on two different conditions. Condition # 1 Some customers may comment on a Service StabiliTrak(R) indicator light along with a Service StabiliTrak(R) message displayed in the DIC. Upon investigation, the technician may find DTC C0196 set in history. Condition # 2 Some customers may comment on a blinking StabiliTrak(R) indicator light along with a StabiliTrak Active message displayed in the DIC during normal driving conditions. No DTCs will be found with this concern. Cause This condition may be caused by a software anomaly within the electronic brake control module (EBCM) that allowed the yaw offset to be falsely learned. Correction Important: From the controller list, select "VSES Vehicle Stability Enhancement System Control Module". If routine diagnosis using SI does not reveal any obvious cause, reprogram the EBCM using SPS with the latest software available on TIS2WEB. Refer to the Service Programming System (SPS) procedures in SI. As always, make sure your Tech 2(R) is updated with the latest software version. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 > Page 11308 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Customer Interest for Electronic Brake Control Module: > 07-08-49-006 > May > 07 > Brakes - StabiliTrak(R) Light On/DTC C0244 Electronic Brake Control Module: Customer Interest Brakes - StabiliTrak(R) Light On/DTC C0244 Bulletin No.: 07-08-49-006 Date: May 07, 2007 TECHNICAL Subject: Intermittent StabiliTrak(R) Service/Indicator Light On, Service StabiliTrak(R) Message Displayed, EBCM DTC C0244 Set (Reprogram Engine Control Module (ECM)) Models: 2006 Chevrolet TrailBlazer SS with 6.0L Engine (VIN H - RPO LS2) Condition Some customers may comment on an intermittent StabiliTrak(R) light being illuminated or a Service StabiliTrak(R) message displayed. Upon investigation, the technician may find EBCM DTC C0244 set in history. This condition may be induced during wide open throttle acceleration from a stop or when accelerating onto an express way during low ambient temperatures. Cause This condition may be caused by the ECM sending out an invalid torque request signal. Correction A new calibration has been released to correct this condition. Reprogram the ECM using SPS. This new service calibration is available on TIS2WEB. Be sure to select the correct calibration part number with the description that states - to prevent C0244 at low ambient temperatures. Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set Electronic Brake Control Module: All Technical Service Bulletins Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set TECHNICAL Bulletin No.: 04-05-25-002E Date: March 11, 2009 Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) Models Supercede: This bulletin is being revised to add step 2 to the procedure and update the Parts and Warranty Information. Please discard Corporate Bulletin Number 04-05-25-002D (Section 05 - Brakes). Condition Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module. Cause A poor connection at the EBCM ground is causing unnecessary replacement of brake modules. Important: The EBCM ground is different for each application. Refer to the list below for the proper ground reference: ^ Midsize Utilities = Ground 304 ^ SSR = Ground 400 ^ Fullsize Trucks and Utilities = Ground 110 Correction Important: Do not replace the brake module to correct this condition. Perform the following repair before further diagnosis of the EBCM. Perform the following steps to improve the connection of the EBCM Ground: 1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire. 2. If the original fastener has a welded on nut, remove the nut from the frame, and if required, enlarge the bolt hole to accommodate the new bolt and nut. 3. Clean the area, front and back, using a tool such as a *3M(TM) Scotch-Brite Roloc disc or equivalent. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 04-05-25-002E > Mar > 09 > Brakes - ABS Lamp ON/DTC's C0265/C0201/U1041 Set > Page 11318 4. Install the ground, then the washer and then the bolt to the frame. Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish. 5. Install a washer and nut to the back side of the frame. Tighten Tighten the nut to 9 Nm (79 lb in). 6. Cover the front and back side of the repair area using Rubberized Undercoating. An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Parts Information Warranty Information Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 Electronic Brake Control Module: All Technical Service Bulletins ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 TECHNICAL Bulletin No.: 08-05-25-005 Date: October 01, 2008 Subject: Intermittent StabiliTrak(R) Indicator Light Blinking, StabiliTrak(R) Active Message Displayed, DTC C0196 Set (Reprogram Electronic Brake Control Module (EBCM)) Models: 2006-2007 Buick Rainier 2006-2009 Chevrolet TrailBlazer Models 2006-2009 GMC Envoy Models 2006-2009 Saab 97X 2006-2009 Isuzu Ascender Models This bulletin provides information on two different conditions. Condition # 1 Some customers may comment on a Service StabiliTrak(R) indicator light along with a Service StabiliTrak(R) message displayed in the DIC. Upon investigation, the technician may find DTC C0196 set in history. Condition # 2 Some customers may comment on a blinking StabiliTrak(R) indicator light along with a StabiliTrak Active message displayed in the DIC during normal driving conditions. No DTCs will be found with this concern. Cause This condition may be caused by a software anomaly within the electronic brake control module (EBCM) that allowed the yaw offset to be falsely learned. Correction Important: From the controller list, select "VSES Vehicle Stability Enhancement System Control Module". If routine diagnosis using SI does not reveal any obvious cause, reprogram the EBCM using SPS with the latest software available on TIS2WEB. Refer to the Service Programming System (SPS) procedures in SI. As always, make sure your Tech 2(R) is updated with the latest software version. Warranty Information (excluding Saab U.S. Models) For vehicles repaired under warranty, use the table. Warranty Information (Saab U.S. Models) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 08-05-25-005 > Oct > 08 > ABS/TCS - StabiliTrak(R) Indicator Blinking/DTC C0196 > Page 11323 For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Electronic Brake Control Module: > 07-08-49-006 > May > 07 > Brakes - StabiliTrak(R) Light On/DTC C0244 Electronic Brake Control Module: All Technical Service Bulletins Brakes - StabiliTrak(R) Light On/DTC C0244 Bulletin No.: 07-08-49-006 Date: May 07, 2007 TECHNICAL Subject: Intermittent StabiliTrak(R) Service/Indicator Light On, Service StabiliTrak(R) Message Displayed, EBCM DTC C0244 Set (Reprogram Engine Control Module (ECM)) Models: 2006 Chevrolet TrailBlazer SS with 6.0L Engine (VIN H - RPO LS2) Condition Some customers may comment on an intermittent StabiliTrak(R) light being illuminated or a Service StabiliTrak(R) message displayed. Upon investigation, the technician may find EBCM DTC C0244 set in history. This condition may be induced during wide open throttle acceleration from a stop or when accelerating onto an express way during low ambient temperatures. Cause This condition may be caused by the ECM sending out an invalid torque request signal. Correction A new calibration has been released to correct this condition. Reprogram the ECM using SPS. This new service calibration is available on TIS2WEB. Be sure to select the correct calibration part number with the description that states - to prevent C0244 at low ambient temperatures. Warranty Information For vehicles repaired under warranty, use the table. Disclaimer Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 11328 Electronic Brake Control Module: Locations Antilock Brake System Component Views Electronic Brake Control Module 2 - Electronic Brake Control Module (EBCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 11329 Electronic Brake Control Module: Diagrams Electronic Brake Control Module (EBCM) Electronic Brake Control Module (EBCM) Electronic Brake Control Module (EBCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 11330 Electronic Brake Control Module (EBCM) Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Electronic Brake Control Module > Component Information > Technical Service Bulletins > Page 11331 Electronic Brake Control Module: Service and Repair Electronic Brake Control Module Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Hydraulic Control Assembly - Antilock Brakes > Component Information > Service and Repair > Brake Pressure Modulator Valve (BPMV) Bracket Replacement Hydraulic Control Assembly - Antilock Brakes: Service and Repair Brake Pressure Modulator Valve (BPMV) Bracket Replacement Brake Pressure Modulator Valve (BPMV) Bracket Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Hydraulic Control Assembly - Antilock Brakes > Component Information > Service and Repair > Brake Pressure Modulator Valve (BPMV) Bracket Replacement > Page 11336 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Hydraulic Control Assembly - Antilock Brakes > Component Information > Service and Repair > Brake Pressure Modulator Valve (BPMV) Bracket Replacement > Page 11337 Hydraulic Control Assembly - Antilock Brakes: Service and Repair Brake Pressure Modulator Valve (BPMV) Replacement Brake Pressure Modulator Valve (BPMV) Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Hydraulic Control Assembly - Antilock Brakes > Component Information > Service and Repair > Brake Pressure Modulator Valve (BPMV) Bracket Replacement > Page 11338 Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Lateral Accelerometer > Component Information > Diagrams Lateral Accelerometer: Diagrams Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Lateral Accelerometer > Component Information > Diagrams > Page 11342 Lateral Accelerometer: Service and Repair Yaw Rate Sensor/Lateral Accelerometer Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Steering Angle Sensor, Traction Control > Component Information > Diagrams Steering Angle Sensor: Diagrams Steering Wheel Speed/Position Sensor Steering Wheel Speed/Position Sensor Steering Wheel Speed/Position Sensor Steering Wheel Speed/Position Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Traction Control Switch > Component Information > Diagrams Traction Control Switch: Diagrams Traction Control Switch Traction Control Switch Traction Control Switch Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Locations Wheel Speed Sensor: Locations Antilock Brake System Component Views Front Hubs And Rotors 2 - Wheel Speed Sensor - LF 3 - Wheel Speed Sensor - RF Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF Wheel Speed Sensor: Diagrams Wheel Speed Sensor - LF Wheel Speed Sensor - LF Wheel Speed Sensor Wheel Speed Sensor - LF Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF > Page 11354 Wheel Speed Sensor: Diagrams Wheel Speed Sensor - LR Wheel Speed Sensor - LR Wheel Speed Sensor Wheel Speed Sensor - LR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF > Page 11355 Wheel Speed Sensor: Diagrams Wheel Speed Sensor - RF Wheel Speed Sensor - RF Wheel Speed Sensor Wheel Speed Sensor - RF Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Diagrams > Wheel Speed Sensor - LF > Page 11356 Wheel Speed Sensor: Diagrams Wheel Speed Sensor - RR Wheel Speed Sensor - RR Wheel Speed Sensor Wheel Speed Sensor - RR Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement Wheel Speed Sensor: Service and Repair Wheel Speed Sensor Replacement Wheel Speed Sensor Replacement Removal Procedure 1. Raise the vehicle. 2. Remove tire and wheel. 3. Remove the brake rotor. 4. Remove the wheel speed sensor wiring harness retainers. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11359 5. Disconnect the wheel speed sensor electrical connector. 6. Remove the sensor mounting screw. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11360 NOTICE: Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device. Prying will cause the sensor body to break off in the bore. NOTICE: Do not attempt to remove the stainless steel shim from the bearing assembly. The shim is permanently attached. If the shim is damaged or bent, replace the bearing assembly. Failure to comply will result in diminished sensor and ABS performance. Important: The wheel speed sensor mounts into a bore that leads to the center of the sealed bearing. Use caution when cleaning or working around the bore. Do not contaminate the lubricant inside the sealed bearing. Failure to do so can lead to premature bearing failure. 7. Remove wheel speed sensor from hub and bearing assembly. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11361 Important: The new speed sensor will have a new O-ring. Dispose of the old O-ring. Lubricate the new O-ring lightly with bearing grease prior to installation. You may also lubricate the sensor just above and below the new O-ring. DO NOT lubricate the bore. 1. Install the speed sensor into the hub and bearing assembly. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the speed sensor mounting screw. ^ Tighten the speed sensor mounting screw to 18 Nm (13 ft. lbs.). 3. Reconnect the wheel speed sensor electrical connector. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11362 Important: The new speed sensor has new mounting clips already installed on the wire. DO NOT reuse the old clips. 4. Install wheel speed sensor wiring harness to the frame and control arm. 5. Install the brake rotor. 6. Install tire and wheel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11363 Wheel Speed Sensor: Service and Repair Wheel Speed Sensor Replacement - Rear Wheel Speed Sensor Replacement - Rear Removal Procedure 1. Raise the vehicle. 2. Disconnect the electrical connector. 3. Remove the wheel speed sensor retaining bolt. 4. Remove the wheel speed sensor. Installation Procedure 1. Using a twisting motion, install the wheel speed sensor until fully seated. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the wheel speed sensor retaining bolt. ^ Tighten the wheel speed sensor retaining bolt to 13 Nm (115 inch lbs.). Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11364 3. Connect the electrical connector. 4. Lower the vehicle. 5. Perform a low speed test to ensure the wheel speed sensor is functioning properly: 1. Start the engine and allow it to idle. 2. Verify the ABS indicator or the traction assist indicator remains illuminated. 3. If the ABS indicator or the traction assist indicator remains illuminated, DO NOT proceed to drive the vehicle until it is diagnosed and repaired. Check the wheel speed sensor electrical connector to ensure it is not damaged and is installed properly. If the lamp remains illuminated, refer to Symptoms - Antilock Brake System. See: Testing and Inspection/Symptom Related Diagnostic Procedures 4. Select a smooth, dry, clean, and level road or large lot that is as free of traffic and obstacles as possible. 5. Drive the vehicle and maintain a speed of at least 16 km/h (10 mph) for at least 5 seconds. 6. Stop the vehicle and check to see if the ABS indicator or the traction assist indicator is illuminated. 7. If an indicator is illuminated, refer to Diagnostic Starting Point - Antilock Brake System. See: Testing and Inspection/Initial Inspection and Diagnostic Overview Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11365 Wheel Speed Sensor: Service and Repair Wheel Speed Sensor Ring Replacement - Rear Wheel Speed Sensor Ring Replacement - Rear ^ Tools Required J 8092 Driver Handle - J 21128 Axle Pinion Oil Seal Installer - J 23690 Bearing Installer - J 2619-01 Slide Hammer - J 45857 Tone Wheel and/or Bearing Remover - J 45860 Tone Ring Installer Removal Procedure 1. Raise the vehicle. 2. Remove the tire and wheel assembly. 3. Remove the rear wheel speed sensor. 4. Remove the rear axle housing cover. 5. Remove the axle shaft. 6. Remove the axle shaft seal, the bearing and the wheel speed sensor ring from the axle housing using the J 45857 (1) and the J 2619-01 (2). Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Wheel Speed Sensor > Component Information > Service and Repair > Wheel Speed Sensor Replacement > Page 11366 1. Install the wheel speed sensor ring using the J 45860 (1) and the J 8092 (2). 2. Drive the wheel speed sensor ring into the axle housing until the tool bottoms against the tube. 3. Install the axle shaft bearing using the J 23690 (1) and the J 8092 (2). 4. Drive the axle shaft bearing into the axle housing until the tool bottoms against the tube. 5. Install the axle shaft seal using the J 21128. 6. Drive the tool into the bore until the axle shaft seal bottoms flush with the tube. 7. Install the axle shaft. 8. Install the rear axle housing cover. 9. Install the rear wheel speed sensor. 10. Install the tire and wheel assembly. 11. Fill the rear axle. Refer to Lubricant Replacement Rear Drive Axle. 12. Lower the vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Yaw Rate Sensor > Component Information > Diagrams Yaw Rate Sensor: Diagrams Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Yaw Rate and Lateral Acceleration Sensor Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Yaw Rate Sensor > Component Information > Diagrams > Page 11370 Yaw Rate Sensor: Service and Repair Yaw Rate Sensor/Lateral Accelerometer Replacement Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure Brake Bleeding: Service and Repair Antilock Brake System Automated Bleed Procedure ABS Automated Bleed Procedure Two - Person Procedure Important: ^ Use the two-person bleed procedure under the following conditions: ^ Installing a new Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV). ^ Air is trapped in the valve body. ^ Do not drive the vehicle until the brake pedal feels firm. ^ Do not reuse brake fluid that is used during bleeding. ^ Use the vacuum, the pressure and the gravity bleeding procedures only for base brake bleeding. 1. Raise the vehicle in order to access the system bleed screws. 2. Bleed the system at the right rear wheel first. 3. Install a clear hose on the bleed screw. 4. Immerse the opposite end of the hose into a container partially filled with clean DOT 3 brake fluid. 5. Open the bleed screw 1/2 to 1 full turn. 6. Slowly depress the brake pedal. While the pedal is depressed to its full extent, tighten the bleed screw. 7. Release the brake pedal and wait 10-15 seconds for the master cylinder pistons to return to the home position. 8. Repeat the previous steps for the remaining wheels. The brake fluid which is present at each bleed screw should be clean and free of air. 9. This procedure may use more than a pint of fluid per wheel. Check the master cylinder fluid level every four to six strokes of the brake pedal in order to avoid running the system dry. 10. Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure. Release the brake pedal between each test. 11. Bleed all four wheels again using Steps 3-9. This will remove the remaining air from the brake system. 12. Evaluate the feel of the brake pedal before attempting to drive the vehicle. 13. Bleed the system as many times as necessary in order to obtain the appropriate feel of the pedal. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure > Page 11375 Brake Bleeding: Service and Repair Hydraulic Brake System Bleeding Manual Hydraulic Brake System Bleeding (Manual) Caution: Refer to Brake Fluid Irritant Caution in Service Precautions. Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Cautions and Notices. Notice: When adding fluid to the brake master cylinder reservoir, use only Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components. 1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills. 2. With the ignition Off and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve. 3. If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps: 1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal. 2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder. 3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder. 4. Reconnect the brake pipe to the master cylinder port and tighten securely. 5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal. 6. Loosen the same brake pipe to purge air from the open port of the master cylinder. 7. Tighten the brake pipe, then have the assistant slowly release the brake pedal. 8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder. 9. With the front brake pipe installed securely to the master cylinder - after all air has been purged from the front port of the master cylinder loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8. 10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened. 4. Fill the brake master cylinder reservoir with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure. Add fluid as needed to maintain the proper level.Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm. 5. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve. 6. Install a transparent hose over the end of the bleeder valve. 7. Submerge the open end of the transparent hose into a transparent container partially filled with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 8. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal. 9. Loosen the bleeder valve to purge air from the wheel hydraulic circuit. 10. Tighten the bleeder valve, then have the assistant slowly release the brake pedal. 11. Wait 15 seconds, then repeat steps 8-10 until all air is purged from the same wheel hydraulic circuit. 12. With the right rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right rear hydraulic circuit - install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve. 13. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11. 14. With the left rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the left rear hydraulic circuit - install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve. 15. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11. 16. With the right front wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right front hydraulic circuit install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve. 17. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11. 18. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened. 19. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 20. Slowly depress and release the brake pedal. Observe the feel of the brake pedal. 21. If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure, perform the following steps: 1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection. See: Hydraulic System/Testing and Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure > Page 11376 Inspection/Component Tests and General Diagnostics/Brake System External Leak Inspection 2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system. 22. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated. Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired. 23. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes. See: Hydraulic System/Testing and Inspection/Symptom Related Diagnostic Procedures Pressure Hydraulic Brake System Bleeding (Pressure) ^ Tools Required J 29532 Diaphragm Type Brake Pressure Bleeder, or equivalent - J 35589-A Brake Pressure Bleeder Adapter Caution: Refer to Brake Fluid Irritant Caution in Service Precautions. Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Service Precautions. Notice: When adding fluid to the brake master cylinder reservoir, use only Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components. 1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills. 2. With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve. 3. If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps: 1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal. 2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder. 3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder. 4. Reconnect the brake pipe to the master cylinder port and tighten securely. 5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal. 6. Loosen the same brake pipe to purge air from the open port of the master cylinder. 7. Tighten the brake pipe, then have the assistant slowly release the brake pedal. 8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder. 9. With the front brake pipe installed securely to the master cylinder - after all air has been purged from the front port of the master cylinder loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8. 10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened. 4. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm. 5. Install the J 35589-A to the brake master cylinder reservoir. 6. Check the brake fluid level in the J 29532, or equivalent. Add Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container as necessary to bring the level to approximately the half-full point. 7. Connect the J 29532, or equivalent, to the J 35589-A. 8. Charge the J 29532, or equivalent, air tank to 175 - 205 kPa (25 - 30 psi). 9. Open the J 29532, or equivalent, fluid tank valve to allow pressurized brake fluid to enter the brake system. 10. Wait approximately 30 seconds, then inspect the entire hydraulic brake system in order to ensure that there are no existing external brake fluid leaks. Any brake fluid leaks identified require repair prior to completing this procedure. 11. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve. 12. Install a transparent hose over the end of the bleeder valve. 13. Submerge the open end of the transparent hose into a transparent container partially filled with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 14. Loosen the bleeder valve to purge air from the wheel hydraulic circuit. Allow fluid to flow until air bubbles stop flowing from the bleeder, then tighten the bleeder valve. 15. With the right rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right rear hydraulic circuit install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve. 16. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14. 17. With the left rear wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the left rear hydraulic circuit - install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Brake Bleeding > System Information > Service and Repair > Antilock Brake System Automated Bleed Procedure > Page 11377 18. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14. 19. With the right front wheel hydraulic circuit bleeder valve tightened securely - after all air has been purged from the right front hydraulic circuit install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve. 20. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14. 21. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened. 22. Close the J 29532, or equivalent, fluid tank valve, then disconnect the J 29532, or equivalent, from the J 35589-A. 23. Remove the J 35589-A from the brake master cylinder reservoir. 24. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme II®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 25. Slowly depress and release the brake pedal. Observe the feel of the brake pedal. 26. If the brake pedal feels spongy perform the following steps: 1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection. See: Hydraulic System/Testing and Inspection/Component Tests and General Diagnostics/Brake System External Leak Inspection 2. Using a scan tool, perform the antilock brake system automated bleeding procedure to remove any air that may have been trapped in the BPMV. Refer to ABS Automated Bleed Procedure. 27. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated. Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired. 28. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes. See: Hydraulic System/Testing and Inspection/Symptom Related Diagnostic Procedures Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Brake Pedal Assy > Component Information > Service and Repair Brake Pedal Assy: Service and Repair Brake Pedal Assembly Replacement Removal Procedure 1. Remove the closeout/insulator panel. 2. Remove the stoplamp switch from the brake pedal. 3. Remove the brake pedal pivot bolt and discard the bolt. 4. Remove the brake pedal. 5. Inspect the brake pedal pivot bushing for damage or wear. Installation Procedure 1. If the brake pedal pivot bushing is damaged or worn, replace the bushing using the following procedure: 1. Squeeze the end that will be facing the brake pedal pivot nut. 2. Insert the bushing into the pivot hub just enough to hold the bushing in place. 3. Push the bushing through the hub until the bushing snaps in place. 2. Install the brake pedal. Notice: Refer to Fastener Notice in Service Precautions. Important: The brake pedal pivot bolt is a prevailing torque bolt and must be replaced each time the bolt is removed. 3. Install the new brake pedal pivot bolt and the brake pedal pivot nut. ^ Tighten the brake pedal pivot bolt to 25 Nm (19 ft. lbs.). 4. Install the stoplamp switch to the brake pedal. 5. Install the closeout/insulator panel. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Testing and Inspection Brake Caliper: Testing and Inspection Brake Caliper Inspection Caution: Refer to Brake Dust Caution in Service Precautions. 1. Inspect the brake caliper housing (1) for cracks, excess wear, and/or damage. If any of these conditions are present, the brake caliper requires replacement. 2. Inspect the caliper piston dust boot seal (2) for cracks, tears, cuts, deterioration and/or improper seating in the caliper body. If any of these conditions are present, the brake caliper requires overhaul or replacement. 3. Inspect for brake fluid leakage around the caliper piston dust boot seal (2) and on the disc brake pads. If there is any evidence of brake fluid leakage, the brake caliper requires overhaul or replacement. 4. Inspect for smooth and complete travel of the caliper pistons into the caliper bores:The movement of the caliper pistons into the caliper bores should be smooth and even. If the caliper piston is frozen or difficult to bottom, the caliper requires overhaul or replacement. ^ For single piston caliper applications, insert a discarded inner brake pad (2) or block of wood in front of the piston. Using a large C-clamp (1) installed over the body of the caliper (3) and against the brake pad or block of wood, slowly bottom the piston in the bore. ^ For dual piston caliper applications, insert a discarded inner brake pad (2) or block of wood in front of the pistons. Using 2 large C-clamps (1) installed over the body of the caliper (3) and against the brake pad or block of wood, slowly bottom the pistons evenly into the bores. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Service and Repair > Brake Caliper Replacement - Front Brake Caliper: Service and Repair Brake Caliper Replacement - Front Brake Caliper Replacement - Front Caution: Refer to Brake Dust Caution in Service Precautions. Caution: Refer to Brake Fluid Irritant Caution in Service Precautions. Removal Procedure 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the tire and wheel assembly. 3. Remove the front brake hose bolt. 4. Install a plug in the front brake caliper hose in order to prevent excessive brake fluid loss and contamination. 5. Discard the metal/copper gaskets. DO NOT reuse them replace with NEW copper gaskets. 6. Remove the front brake caliper guide pin bolts. 7. Remove the front brake caliper from the mounting bracket. Installation Procedure Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Service and Repair > Brake Caliper Replacement - Front > Page 11387 1. If the brake caliper guide pin is to be reused, clean the brake caliper guide pin using denatured alcohol, or equivalent. 2. Dry the brake caliper guide pin using non-lubricated, filtered air. 3. Apply high temperature silicone brake lubricant to the brake caliper guide pin. DO NOT apply lubricant to the brake pad hardware. 4. Install the front brake caliper to the mounting bracket. Notice: Refer to Fastener Notice in Service Precautions. Important: Tighten the leading bolt, closest to the bleed screw, first. 5. Install the front brake caliper guide pins bolts. ^ Tighten the front brake caliper guide pin bolts to 64 Nm (47 ft. lbs.). Important: DO NOT reuse the metal/copper gaskets. Use only new copper gaskets. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Service and Repair > Brake Caliper Replacement - Front > Page 11388 6. Install the NEW metal/copper gaskets to the front brake caliper bolt. 7. Install the front brake hose bolt and gaskets. ^ Tighten the brake hose bolt to 40 Nm (30 ft. lbs.). 8. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Pressure). 9. Install the tire and wheel assembly. 10. Lower the vehicle. Refer to Lifting and Jacking the Vehicle. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Service and Repair > Brake Caliper Replacement - Front > Page 11389 Brake Caliper: Service and Repair Brake Caliper Bracket Replacement - Front Brake Caliper Bracket Replacement - Front Caution: Refer to Brake Dust Caution in Service Precautions. Removal Procedure 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. 2. Remove the tire and wheel assembly. 3. Inspect the brake caliper assembly. Refer to Brake Caliper Inspection. Notice: Support the brake caliper with heavy mechanic's wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak. 4. Remove the front brake caliper assembly. Relocate the brake caliper to the side. 5. Inspect the brake pads. Refer to Brake Pad Inspection. 6. Remove the front brake pads from the mounting bracket. Inboard brake pad shown. 7. Inspect the brake hardware. Refer to Disc Brake Mounting and Hardware Inspection - Front. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Service and Repair > Brake Caliper Replacement - Front > Page 11390 8. Remove the brake pad retaining clips from the mounting bracket. Inboard brake pad shown. 9. Remove the brake caliper mounting bracket retaining bolts. Lower bolt shown. 10. Remove the brake caliper mounting bracket. 11. Remove the guide pin seals from the brake caliper mounting bracket. 12. Inspect the brake rotor. Refer to Brake Rotor Surface and Wear Inspection. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Service and Repair > Brake Caliper Replacement - Front > Page 11391 Installation Procedure 1. Install the guide pin seals on the mounting bracket. 2. If the guide pins and brake pad retaining clips are to be reused, use denatured alcohol to clean them. 3. Dry the brake guide pins and brake pad retaining clips with non-lubricated, filtered air. 4. Apply high temperature silicone brake lubricant to the brake caliper guide pins. DO NOT apply the lubricant to the brake pad retaining clips. 5. Install the brake caliper mounting bracket. Notice: Refer to Fastener Notice in Service Precautions. Chevrolet Trailblazer 2wd Workshop Manual (V8-6.0L VIN H (2006)) Chevrolet Workshop Manuals > Brakes and Traction Control > Disc Brake System > Brake Caliper > Component Information > Service and Repair > Brake Caliper Replacement - Front > Page 11392 6. Install the caliper mounting bracket bolts. ^ Tighten the brake caliper mounting bracket bolts to 150 Nm (110 ft. lbs.). 7. Install the front brake pad hardware to the brake caliper mounting bracket. 8. Install the brake pads to the brake caliper mounting bracket. 9. Install the brake caliper assembly. 10. Install the tire and wheel assembly. 11. Lower the vehicle. Refer to Lifting and Jacking the Vehicle. Caution: Refer to Firm Brake Pedal Caution in Service Precautions. 12 Pump the brake pedal slowly and firmly in order to seat the brake pads.